StigData/Processed/RHEL-7-3.11.xml
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<DISASTIG version="3" classification="UNCLASSIFIED" customname="" stigid="RHEL_7_STIG" description="This Security Technical Implementation Guide is published as a tool to improve the security of Department of Defense (DOD) information systems. The requirements are derived from the National Institute of Standards and Technology (NIST) 800-53 and related documents. Comments or proposed revisions to this document should be sent via email to the following address: disa.stig_spt@mail.mil." filename="U_RHEL_7_STIG_V3R11_Manual-xccdf.xml" releaseinfo="Release: 11 Benchmark Date: 27 Apr 2023 3.4.0.34222 1.10.0" title="Red Hat Enterprise Linux 7 Security Technical Implementation Guide" notice="terms-of-use" source="STIG.DOD.MIL" fullversion="3.11" created="6/15/2023">
<DocumentRule dscresourcemodule="None"> <Rule id="V-204392" severity="high" conversionstatus="pass" title="SRG-OS-000257-GPOS-00098" dscresource="None"> <Description><VulnDiscussion>Discretionary access control is weakened if a user or group has access permissions to system files and directories greater than the default. Satisfies: SRG-OS-000257-GPOS-00098, SRG-OS-000278-GPOS-00108</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71849</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the file permissions, ownership, and group membership of system files and commands match the vendor values. Check the default file permissions, ownership, and group membership of system files and commands with the following command: # for i in `rpm -Va | grep -E '^.{1}M|^.{5}U|^.{6}G' | cut -d " " -f 4,5`;do for j in `rpm -qf $i`;do rpm -ql $j --dump | cut -d " " -f 1,5,6,7 | grep $i;done;done /var/log/gdm 040755 root root /etc/audisp/audisp-remote.conf 0100640 root root /usr/bin/passwd 0104755 root root For each file returned, verify the current permissions, ownership, and group membership: # ls -la <filename> -rw-------. 1 root root 2017 Nov 1 10:03 /etc/audisp/audisp-remote.conf If the file is more permissive than the default permissions, this is a finding. If the file is not owned by the default owner and is not documented with the Information System Security Officer (ISSO), this is a finding. If the file is not a member of the default group and is not documented with the Information System Security Officer (ISSO), this is a finding.</RawString> </Rule> <Rule id="V-204393" severity="medium" conversionstatus="pass" title="SRG-OS-000023-GPOS-00006" dscresource="None"> <Description><VulnDiscussion>Display of a standardized and approved use notification before granting access to the operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. System use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist. The banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for operating systems that can accommodate banners of 1300 characters: "You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details." Satisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000024-GPOS-00007, SRG-OS-000228-GPOS-00088</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71859</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system displays the Standard Mandatory DoD Notice and Consent Banner before granting access to the operating system via a graphical user logon. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Check to see if the operating system displays a banner at the logon screen with the following command: # grep banner-message-enable /etc/dconf/db/local.d/* banner-message-enable=true If "banner-message-enable" is set to "false" or is missing, this is a finding.</RawString> </Rule> <Rule id="V-204396" severity="medium" conversionstatus="pass" title="SRG-OS-000028-GPOS-00009" dscresource="None"> <Description><VulnDiscussion>A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence. The session lock is implemented at the point where session activity can be determined. Regardless of where the session lock is determined and implemented, once invoked, the session lock must remain in place until the user reauthenticates. No other activity aside from reauthentication must unlock the system. Satisfies: SRG-OS-000028-GPOS-00009, SRG-OS-000030-GPOS-00011</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71891</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system enables a user's session lock until that user re-establishes access using established identification and authentication procedures. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Check to see if the screen lock is enabled with the following command: # grep -ir lock-enabled /etc/dconf/db/local.d/ | grep -v locks lock-enabled=true If the "lock-enabled" setting is missing or is not set to "true", this is a finding.</RawString> </Rule> <Rule id="V-204397" severity="medium" conversionstatus="pass" title="SRG-OS-000375-GPOS-00160" dscresource="None"> <Description><VulnDiscussion>To assure accountability and prevent unauthenticated access, users must be identified and authenticated to prevent potential misuse and compromise of the system. Multifactor solutions that require devices separate from information systems gaining access include, for example, hardware tokens providing time-based or challenge-response authenticators and smart cards such as the U.S. Government Personal Identity Verification card and the DoD Common Access Card. Satisfies: SRG-OS-000375-GPOS-00161,SRG-OS-000375-GPOS-00162</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-77819</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system uniquely identifies and authenticates users using multifactor authentication via a graphical user logon. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Determine which profile the system database is using with the following command: # grep system-db /etc/dconf/profile/user system-db:local Note: The example is using the database local for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than local is being used. # grep enable-smartcard-authentication /etc/dconf/db/local.d/* enable-smartcard-authentication=true If "enable-smartcard-authentication" is set to "false" or the keyword is missing, this is a finding.</RawString> </Rule> <Rule id="V-204398" severity="medium" conversionstatus="pass" title="SRG-OS-000029-GPOS-00010" dscresource="None"> <Description><VulnDiscussion>A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71893</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system initiates a screensaver after a 15-minute period of inactivity for graphical user interfaces. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Check to see if GNOME is configured to display a screensaver after a 15 minute delay with the following command: # grep -i idle-delay /etc/dconf/db/local.d/* idle-delay=uint32 900 If the "idle-delay" setting is missing or is not set to "900" or less, this is a finding.</RawString> </Rule> <Rule id="V-204402" severity="medium" conversionstatus="pass" title="SRG-OS-000029-GPOS-00010" dscresource="None"> <Description><VulnDiscussion>A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71899</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system initiates a session lock after a 15-minute period of inactivity for graphical user interfaces. Note: If the system does not have a GNOME installed, this requirement is Not Applicable. Check for the session lock settings with the following commands: # grep -i idle-activation-enabled /etc/dconf/db/local.d/* idle-activation-enabled=true If "idle-activation-enabled" is not set to "true", this is a finding.</RawString> </Rule> <Rule id="V-204404" severity="medium" conversionstatus="pass" title="SRG-OS-000029-GPOS-00010" dscresource="None"> <Description><VulnDiscussion>A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71901</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system initiates a session lock a for graphical user interfaces when the screensaver is activated. Note: If the system does not have GNOME installed, this requirement is Not Applicable. If GNOME is installed, check to see a session lock occurs when the screensaver is activated with the following command: # grep -i lock-delay /etc/dconf/db/local.d/* lock-delay=uint32 5 If the "lock-delay" setting is missing, or is not set to "5" or less, this is a finding.</RawString> </Rule> <Rule id="V-204406" severity="medium" conversionstatus="pass" title="SRG-OS-000069-GPOS-00037" dscresource="None"> <Description><VulnDiscussion>Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. "pwquality" enforces complex password construction configuration and has the ability to limit brute-force attacks on the system.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-73159</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system uses "pwquality" to enforce the password complexity rules. Check for the use of "pwquality" with the following command: # cat /etc/pam.d/system-auth | grep pam_pwquality password requisite pam_pwquality.so retry=3 If the command does not return an uncommented line containing the value "pam_pwquality.so" as shown, this is a finding. If the value of "retry" is set to "0" or greater than "3", this is a finding.</RawString> </Rule> <Rule id="V-204415" severity="medium" conversionstatus="pass" title="SRG-OS-000073-GPOS-00041" dscresource="None"> <Description><VulnDiscussion>Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised. Passwords encrypted with a weak algorithm are no more protected than if they are kept in plain text.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71919</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the PAM system service is configured to store only encrypted representations of passwords. The strength of encryption that must be used to hash passwords for all accounts is SHA512. Check that the system is configured to create SHA512 hashed passwords with the following command: # grep password /etc/pam.d/system-auth /etc/pam.d/password-auth Outcome should look like following: /etc/pam.d/system-auth-ac:password sufficient pam_unix.so sha512 shadow try_first_pass use_authtok /etc/pam.d/password-auth:password sufficient pam_unix.so sha512 shadow try_first_pass use_authtok If the "/etc/pam.d/system-auth" and "/etc/pam.d/password-auth" configuration files allow for password hashes other than SHA512 to be used, this is a finding.</RawString> </Rule> <Rule id="V-204417" severity="medium" conversionstatus="pass" title="SRG-OS-000073-GPOS-00041" dscresource="None"> <Description><VulnDiscussion>Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised. Passwords encrypted with a weak algorithm are no more protected than if they are kept in plain text.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71923</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the user and group account administration utilities are configured to store only encrypted representations of passwords. The strength of encryption that must be used to hash passwords for all accounts is "SHA512". Check that the system is configured to create "SHA512" hashed passwords with the following command: # grep -i sha512 /etc/libuser.conf crypt_style = sha512 If the "crypt_style" variable is not set to "sha512", is not in the defaults section, is commented out, or does not exist, this is a finding.</RawString> </Rule> <Rule id="V-204422" severity="medium" conversionstatus="pass" title="SRG-OS-000077-GPOS-00045" dscresource="None"> <Description><VulnDiscussion>Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. If the information system or application allows the user to consecutively reuse their password when that password has exceeded its defined lifetime, the end result is a password that is not changed per policy requirements.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71933</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system prohibits password reuse for a minimum of five generations. Check for the value of the "remember" argument in "/etc/pam.d/system-auth" and "/etc/pam.d/password-auth" with the following command: # grep -i remember /etc/pam.d/system-auth /etc/pam.d/password-auth password requisite pam_pwhistory.so use_authtok remember=5 retry=3 If the line containing the "pam_pwhistory.so" line does not have the "remember" module argument set, is commented out, or the value of the "remember" module argument is set to less than "5", this is a finding.</RawString> </Rule> <Rule id="V-204424" severity="high" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If an account has an empty password, anyone could log on and run commands with the privileges of that account. Accounts with empty passwords should never be used in operational environments.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71937</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>HardCodedRule(nxFileLineRule)@{DscResource = 'nxFileLine'; ContainsLine = $null; DoesNotContainPattern = $null; FilePath = '/etc/pam.d/password-auth'; OrganizationValueTestString = 'rule V-204424 is reviewed for guidence on configurating ContainsLine/DoesNotContainPattern '}<splitRule>HardCodedRule(nxFileLineRule)@{DscResource = 'nxFileLine'; ContainsLine = $null; DoesNotContainPattern = $null; FilePath = '/etc/pam.d/system-auth'; OrganizationValueTestString = 'rule V-204424 is reviewed for guidence on configurating ContainsLine/DoesNotContainPattern '}</RawString> </Rule> <Rule id="V-204427" severity="medium" conversionstatus="pass" title="SRG-OS-000329-GPOS-00128" dscresource="None"> <Description><VulnDiscussion>By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-forcing, is reduced. Limits are imposed by locking the account. Satisfies: SRG-OS-000329-GPOS-00128, SRG-OS-000021-GPOS-00005</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71943</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Check that the system locks an account for a minimum of 15 minutes after three unsuccessful logon attempts within a period of 15 minutes with the following command: # grep pam_faillock.so /etc/pam.d/password-auth auth required pam_faillock.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=900 auth [default=die] pam_faillock.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=900 account required pam_faillock.so If the "deny" parameter is set to "0" or a value greater than "3" on both "auth" lines with the "pam_faillock.so" module, or is missing from these lines, this is a finding. If the "even_deny_root" parameter is not set on both "auth" lines with the "pam_faillock.so" module, or is missing from these lines, this is a finding. If the "fail_interval" parameter is set to "0" or is set to a value less than "900" on both "auth" lines with the "pam_faillock.so" module, or is missing from these lines, this is a finding. If the "unlock_time" parameter is not set to "0", "never", or is set to a value less than "900" on both "auth" lines with the "pam_faillock.so" module, or is missing from these lines, this is a finding. Note: The maximum configurable value for "unlock_time" is "604800". If any line referencing the "pam_faillock.so" module is commented out, this is a finding. # grep pam_faillock.so /etc/pam.d/system-auth auth required pam_faillock.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=900 auth [default=die] pam_faillock.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=900 account required pam_faillock.so If the "deny" parameter is set to "0" or a value greater than "3" on both "auth" lines with the "pam_faillock.so" module, or is missing from these lines, this is a finding. If the "even_deny_root" parameter is not set on both "auth" lines with the "pam_faillock.so" module, or is missing from these lines, this is a finding. If the "fail_interval" parameter is set to "0" or is set to a value less than "900" on both "auth" lines with the "pam_faillock.so" module, or is missing from these lines, this is a finding. If the "unlock_time" parameter is not set to "0", "never", or is set to a value less than "900" on both "auth" lines with the "pam_faillock.so" module or is missing from these lines, this is a finding. Note: The maximum configurable value for "unlock_time" is "604800". If any line referencing the "pam_faillock.so" module is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204428" severity="medium" conversionstatus="pass" title="SRG-OS-000329-GPOS-00128" dscresource="None"> <Description><VulnDiscussion>By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute forcing, is reduced. Limits are imposed by locking the account. Satisfies: SRG-OS-000329-GPOS-00128, SRG-OS-000021-GPOS-00005</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71945</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system automatically locks the root account, for a minimum of 15 minutes, when three unsuccessful logon attempts in 15 minutes are made. # grep pam_faillock.so /etc/pam.d/password-auth auth required pam_faillock.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=900 auth [default=die] pam_faillock.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=900 account required pam_faillock.so If the "even_deny_root" setting is not defined on both lines with the "pam_faillock.so" module, is commented out, or is missing from a line, this is a finding. # grep pam_faillock.so /etc/pam.d/system-auth auth required pam_faillock.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=900 auth [default=die] pam_faillock.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=900 account required pam_faillock.so If the "even_deny_root" setting is not defined on both lines with the "pam_faillock.so" module, is commented out, or is missing from a line, this is a finding.</RawString> </Rule> <Rule id="V-204429" severity="medium" conversionstatus="pass" title="SRG-OS-000373-GPOS-00156" dscresource="None"> <Description><VulnDiscussion>Without re-authentication, users may access resources or perform tasks for which they do not have authorization. When operating systems provide the capability to escalate a functional capability, it is critical the user re-authenticate. Satisfies: SRG-OS-000373-GPOS-00156, SRG-OS-000373-GPOS-00157, SRG-OS-000373-GPOS-00158</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71947</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system requires users to supply a password for privilege escalation. Check the configuration of the "/etc/sudoers" and "/etc/sudoers.d/*" files with the following command: $ sudo grep -ir nopasswd /etc/sudoers /etc/sudoers.d If any occurrences of "NOPASSWD" are returned from the command and have not been documented with the Information System Security Officer (ISSO) as an organizationally defined administrative group utilizing MFA, this is a finding.</RawString> </Rule> <Rule id="V-204432" severity="high" conversionstatus="pass" title="SRG-OS-000480-GPOS-00229" dscresource="None"> <Description><VulnDiscussion>Failure to restrict system access to authenticated users negatively impacts operating system security.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71953</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system does not allow an unattended or automatic logon to the system via a graphical user interface. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Check for the value of the "AutomaticLoginEnable" in the "/etc/gdm/custom.conf" file with the following command: # grep -i automaticloginenable /etc/gdm/custom.conf AutomaticLoginEnable=false If the value of "AutomaticLoginEnable" is not set to "false", this is a finding.</RawString> </Rule> <Rule id="V-204433" severity="high" conversionstatus="pass" title="SRG-OS-000480-GPOS-00229" dscresource="None"> <Description><VulnDiscussion>Failure to restrict system access to authenticated users negatively impacts operating system security.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71955</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system does not allow an unrestricted logon to the system via a graphical user interface. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Check for the value of the "TimedLoginEnable" parameter in "/etc/gdm/custom.conf" file with the following command: # grep -i timedloginenable /etc/gdm/custom.conf TimedLoginEnable=false If the value of "TimedLoginEnable" is not set to "false", this is a finding.</RawString> </Rule> <Rule id="V-204437" severity="medium" conversionstatus="pass" title="SRG-OS-000080-GPOS-00048" dscresource="None"> <Description><VulnDiscussion>If the system does not require valid root authentication before it boots into single-user or maintenance mode, anyone who invokes single-user or maintenance mode is granted privileged access to all files on the system.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-77823</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system must require authentication upon booting into single-user and maintenance modes. Check that the operating system requires authentication upon booting into single-user mode with the following command: # grep -i execstart /usr/lib/systemd/system/rescue.service | grep -i sulogin ExecStart=-/bin/sh -c "/usr/sbin/sulogin; /usr/bin/systemctl --fail --no-block default" If "ExecStart" does not have "/usr/sbin/sulogin" as an option, this is a finding.</RawString> </Rule> <Rule id="V-204438" severity="high" conversionstatus="pass" title="SRG-OS-000080-GPOS-00048" dscresource="None"> <Description><VulnDiscussion>If the system does not require valid authentication before it boots into single-user or maintenance mode, anyone who invokes single-user or maintenance mode is granted privileged access to all files on the system. GRUB 2 is the default boot loader for RHEL 7 and is designed to require a password to boot into single-user mode or make modifications to the boot menu.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-81005</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>For systems that use UEFI, this is Not Applicable. For systems that are running a version of RHEL prior to 7.2, this is Not Applicable. Check to see if an encrypted grub superusers password is set. On systems that use a BIOS, use the following command: $ sudo grep -iw grub2_password /boot/grub2/user.cfg GRUB2_PASSWORD=grub.pbkdf2.sha512.[password_hash] If the grub superusers password does not begin with "grub.pbkdf2.sha512", this is a finding.</RawString> </Rule> <Rule id="V-204440" severity="high" conversionstatus="pass" title="SRG-OS-000080-GPOS-00048" dscresource="None"> <Description><VulnDiscussion>If the system does not require valid authentication before it boots into single-user or maintenance mode, anyone who invokes single-user or maintenance mode is granted privileged access to all files on the system. GRUB 2 is the default boot loader for RHEL 7 and is designed to require a password to boot into single-user mode or make modifications to the boot menu.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-81007</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>For systems that use BIOS, this is Not Applicable. For systems that are running a version of RHEL prior to 7.2, this is Not Applicable. Check to see if an encrypted grub superusers password is set. On systems that use UEFI, use the following command: $ sudo grep -iw grub2_password /boot/efi/EFI/redhat/user.cfg GRUB2_PASSWORD=grub.pbkdf2.sha512.[password_hash] If the grub superusers password does not begin with "grub.pbkdf2.sha512", this is a finding.</RawString> </Rule> <Rule id="V-204444" severity="medium" conversionstatus="pass" title="SRG-OS-000324-GPOS-00125" dscresource="None"> <Description><VulnDiscussion>Preventing non-privileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges. Privileged functions include, for example, establishing accounts, performing system integrity checks, or administering cryptographic key management activities. Non-privileged users are individuals who do not possess appropriate authorizations. Circumventing intrusion detection and prevention mechanisms or malicious code protection mechanisms are examples of privileged functions that require protection from non-privileged users.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71971</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Note: Per OPORD 16-0080, the preferred endpoint security tool is Endpoint Security for Linux (ENSL) in conjunction with SELinux. Verify the operating system prevents non-privileged users from executing privileged functions to include disabling, circumventing, or altering implemented security safeguards/countermeasures. Get a list of authorized users for the system. Check the list against the system by using the following command: $ sudo semanage login -l | more Login Name SELinux User MLS/MCS Range Service __default__ user_u s0-s0:c0.c1023 * root unconfined_u s0-s0:c0.c1023 * system_u system_u s0-s0:c0.c1023 * joe staff_u s0-s0:c0.c1023 * All administrators must be mapped to the , "staff_u", or an appropriately tailored confined SELinux user as defined by the organization. All authorized non-administrative users must be mapped to the "user_u" SELinux user. If they are not mapped in this way, this is a finding. If administrator accounts are mapped to the "sysadm_u" SELinux user and are not documented as an operational requirement with the ISSO, this is a finding. If administrator accounts are mapped to the "sysadm_u" SELinux user and are documented as an operational requirement with the ISSO, this can be downgraded to a CAT III.</RawString> </Rule> <Rule id="V-204456" severity="high" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>A locally logged-on user who presses Ctrl-Alt-Delete, when at the console, can reboot the system. If accidentally pressed, as could happen in the case of a mixed OS environment, this can create the risk of short-term loss of availability of systems due to unintentional reboot. In the graphical environment, risk of unintentional reboot from the Ctrl-Alt-Delete sequence is reduced because the user will be prompted before any action is taken.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-94843</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Note: If the operating system does not have a graphical user interface installed, this requirement is Not Applicable. Verify the operating system is not configured to reboot the system when Ctrl-Alt-Delete is pressed. Check that the ctrl-alt-del.target is masked and not active in the graphical user interface with the following command: # grep logout /etc/dconf/db/local.d/* logout='' If "logout" is not set to use two single quotations, or is missing, this is a finding.</RawString> </Rule> <Rule id="V-204459" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Timely patching is critical for maintaining the operational availability, confidentiality, and integrity of information technology (IT) systems. However, failure to keep operating system and application software patched is a common mistake made by IT professionals. New patches are released daily, and it is often difficult for even experienced System Administrators to keep abreast of all the new patches. When new weaknesses in an operating system exist, patches are usually made available by the vendor to resolve the problems. If the most recent security patches and updates are not installed, unauthorized users may take advantage of weaknesses in the unpatched software. The lack of prompt attention to patching could result in a system compromise.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71999</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system security patches and updates are installed and up to date. Updates are required to be applied with a frequency determined by the site or Program Management Office (PMO). Obtain the list of available package security updates from Red Hat. The URL for updates is https://rhn.redhat.com/errata/. It is important to note that updates provided by Red Hat may not be present on the system if the underlying packages are not installed. Check that the available package security updates have been installed on the system with the following command: # yum history list | more Loaded plugins: langpacks, product-id, subscription-manager ID | Command line | Date and time | Action(s) | Altered ------------------------------------------------------------------------------- 70 | install aide | 2016-05-05 10:58 | Install | 1 69 | update -y | 2016-05-04 14:34 | Update | 18 EE 68 | install vlc | 2016-04-21 17:12 | Install | 21 67 | update -y | 2016-04-21 17:04 | Update | 7 EE 66 | update -y | 2016-04-15 16:47 | E, I, U | 84 EE If package updates have not been performed on the system within the timeframe that the site/program documentation requires, this is a finding. Typical update frequency may be overridden by Information Assurance Vulnerability Alert (IAVA) notifications from CYBERCOM. If the operating system is in non-compliance with the Information Assurance Vulnerability Management (IAVM) process, this is a finding.</RawString> </Rule> <Rule id="V-204460" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Accounts providing no operational purpose provide additional opportunities for system compromise. Unnecessary accounts include user accounts for individuals not requiring access to the system and application accounts for applications not installed on the system.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72001</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify all accounts on the system are assigned to an active system, application, or user account. Obtain the list of authorized system accounts from the Information System Security Officer (ISSO). Check the system accounts on the system with the following command: # more /etc/passwd root:x:0:0:root:/root:/bin/bash bin:x:1:1:bin:/bin:/sbin/nologin daemon:x:2:2:daemon:/sbin:/sbin/nologin sync:x:5:0:sync:/sbin:/bin/sync shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown halt:x:7:0:halt:/sbin:/sbin/halt games:x:12:100:games:/usr/games:/sbin/nologin gopher:x:13:30:gopher:/var/gopher:/sbin/nologin Accounts such as "games" and "gopher" are not authorized accounts as they do not support authorized system functions. If the accounts on the system do not match the provided documentation, or accounts that do not support an authorized system function are present, this is a finding.</RawString> </Rule> <Rule id="V-204483" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>The "noexec" mount option causes the system to not execute binary files. This option must be used for mounting any file system not containing approved binary files as they may be incompatible. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-73161</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify file systems that are being NFS imported are configured with the "noexec" option. Find the file system(s) that contain the directories being imported with the following command: # more /etc/fstab | grep nfs UUID=e06097bb-cfcd-437b-9e4d-a691f5662a7d /store nfs rw,noexec 0 0 If a file system found in "/etc/fstab" refers to NFS and it does not have the "noexec" option set, and use of NFS imported binaries is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding. Verify the NFS is mounted with the "noexec"option: # mount | grep nfs | grep noexec If no results are returned and use of NFS imported binaries is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.</RawString> </Rule> <Rule id="V-204488" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>The umask controls the default access mode assigned to newly created files. A umask of 077 limits new files to mode 700 or less permissive. Although umask can be represented as a four-digit number, the first digit representing special access modes is typically ignored or required to be "0". This requirement applies to the globally configured system defaults and the local interactive user defaults for each account on the system.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72049</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that the default umask for all local interactive users is "077". Identify the locations of all local interactive user home directories by looking at the "/etc/passwd" file. Check all local interactive user initialization files for interactive users with the following command: Note: The example is for a system that is configured to create users home directories in the "/home" directory. $ sudo grep -ir ^umask /home | grep -v '.bash_history' If any local interactive user initialization files are found to have a umask statement that has a value less restrictive than "077", this is a finding.</RawString> </Rule> <Rule id="V-204489" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Cron logging can be used to trace the successful or unsuccessful execution of cron jobs. It can also be used to spot intrusions into the use of the cron facility by unauthorized and malicious users.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72051</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that "rsyslog" is configured to log cron events. Check the configuration of "/etc/rsyslog.conf" or "/etc/rsyslog.d/*.conf" files for the cron facility with the following command: Note: If another logging package is used, substitute the utility configuration file for "/etc/rsyslog.conf" or "/etc/rsyslog.d/*.conf" files. # grep cron /etc/rsyslog.conf /etc/rsyslog.d/*.conf cron.* /var/log/cron If the command does not return a response, check for cron logging all facilities by inspecting the "/etc/rsyslog.conf" or "/etc/rsyslog.d/*.conf" files. Look for the following entry: *.* /var/log/messages If "rsyslog" is not logging messages for the cron facility or all facilities, this is a finding.</RawString> </Rule> <Rule id="V-204496" severity="low" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72065</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that a separate file system/partition has been created for "/tmp". Check that a file system/partition has been created for "/tmp" with the following command: # systemctl is-enabled tmp.mount enabled If the "tmp.mount" service is not enabled, check to see if "/tmp" is defined in the fstab with a device and mount point: # grep -i /tmp /etc/fstab UUID=a411dc99-f2a1-4c87-9e05-184977be8539 /tmp ext4 rw,relatime,discard,data=ordered,nosuid,noexec, 0 0 If "tmp.mount" service is not enabled or the "/tmp" directory is not defined in the fstab with a device and mount point, this is a finding. </RawString> </Rule> <Rule id="V-204501" severity="medium" conversionstatus="pass" title="SRG-OS-000364-GPOS-00151" dscresource="None"> <Description><VulnDiscussion>Malicious users with removable boot media can gain access to a system configured to use removable media as the boot loader. If removable media is designed to be used as the boot loader, the requirement must be documented with the Information System Security Officer (ISSO).</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72075</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the system is not configured to use a boot loader on removable media. Note: GRUB 2 reads its configuration from the "/boot/grub2/grub.cfg" file on traditional BIOS-based machines and from the "/boot/efi/EFI/redhat/grub.cfg" file on UEFI machines. Check for the existence of alternate boot loader configuration files with the following command: # find / -name grub.cfg /boot/grub2/grub.cfg If a "grub.cfg" is found in any subdirectories other than "/boot/grub2" and "/boot/efi/EFI/redhat", ask the System Administrator if there is documentation signed by the ISSO to approve the use of removable media as a boot loader. Check that the grub configuration file has the set root command in each menu entry with the following commands: # grep -cw menuentry /boot/grub2/grub.cfg 1 # grep 'set root' /boot/grub2/grub.cfg set root=(hd0,1) If the system is using an alternate boot loader on removable media, and documentation does not exist approving the alternate configuration, this is a finding.</RawString> </Rule> <Rule id="V-204575" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Unintentionally running a rsyslog server accepting remote messages puts the system at increased risk. Malicious rsyslog messages sent to the server could exploit vulnerabilities in the server software itself, could introduce misleading information in to the system's logs, or could fill the system's storage leading to a Denial of Service. If the system is intended to be a log aggregation server its use must be documented with the ISSO.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72211</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that the system is not accepting "rsyslog" messages from other systems unless it is documented as a log aggregation server. Check the configuration of "rsyslog" with the following command: # grep imtcp /etc/rsyslog.conf $ModLoad imtcp # grep imudp /etc/rsyslog.conf $ModLoad imudp # grep imrelp /etc/rsyslog.conf $ModLoad imrelp If any of the above modules are being loaded in the "/etc/rsyslog.conf" file, ask to see the documentation for the system being used for log aggregation. If the documentation does not exist, or does not specify the server as a log aggregation system, this is a finding.</RawString> </Rule> <Rule id="V-204581" severity="medium" conversionstatus="pass" title="SRG-OS-000250-GPOS-00093" dscresource="None"> <Description><VulnDiscussion>Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Cryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the key used to generate the hash.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72227</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>If LDAP is not being utilized, this requirement is Not Applicable. Verify the operating system implements cryptography to protect the integrity of remote LDAP authentication sessions. To determine if LDAP is being used for authentication, use the following command: # systemctl status sssd.service sssd.service - System Security Services Daemon Loaded: loaded (/usr/lib/systemd/system/sssd.service; enabled; vendor preset: disabled) Active: active (running) since Wed 2018-06-27 10:58:11 EST; 1h 50min ago If the "sssd.service" is "active", then LDAP is being used. Determine the "id_provider" the LDAP is currently using: # grep -i "id_provider" /etc/sssd/sssd.conf id_provider = ad If "id_provider" is set to "ad", this is Not Applicable. Ensure that LDAP is configured to use TLS by using the following command: # grep -i "start_tls" /etc/sssd/sssd.conf ldap_id_use_start_tls = true If the "ldap_id_use_start_tls" option is not "true", this is a finding.</RawString> </Rule> <Rule id="V-204582" severity="medium" conversionstatus="pass" title="SRG-OS-000250-GPOS-00093" dscresource="None"> <Description><VulnDiscussion>Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Cryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the key used to generate the hash.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72229</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>If LDAP is not being utilized, this requirement is Not Applicable. Verify the operating system implements cryptography to protect the integrity of remote LDAP access sessions. To determine if LDAP is being used for authentication, use the following command: # systemctl status sssd.service sssd.service - System Security Services Daemon Loaded: loaded (/usr/lib/systemd/system/sssd.service; enabled; vendor preset: disabled) Active: active (running) since Wed 2018-06-27 10:58:11 EST; 1h 50min ago If the "sssd.service" is "active", then LDAP is being used. Determine the "id_provider" the LDAP is currently using: # grep -i "id_provider" /etc/sssd/sssd.conf id_provider = ad If "id_provider" is set to "ad", this is Not Applicable. Verify the sssd service is configured to require the use of certificates: # grep -i tls_reqcert /etc/sssd/sssd.conf ldap_tls_reqcert = demand If the "ldap_tls_reqcert" setting is missing, commented out, or does not exist, this is a finding. If the "ldap_tls_reqcert" setting is not set to "demand" or "hard", this is a finding.</RawString> </Rule> <Rule id="V-204603" severity="medium" conversionstatus="pass" title="SRG-OS-000355-GPOS-00143" dscresource="None"> <Description><VulnDiscussion>Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time a particular event occurred on a system is critical when conducting forensic analysis and investigating system events. Sources outside the configured acceptable allowance (drift) may be inaccurate. Synchronizing internal information system clocks provides uniformity of time stamps for information systems with multiple system clocks and systems connected over a network. Organizations should consider endpoints that may not have regular access to the authoritative time server (e.g., mobile, teleworking, and tactical endpoints). Satisfies: SRG-OS-000355-GPOS-00143, SRG-OS-000356-GPOS-00144</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72269</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Check to see if NTP is running in continuous mode: # ps -ef | grep ntp If NTP is not running, check to see if "chronyd" is running in continuous mode: # ps -ef | grep chronyd If NTP or "chronyd" is not running, this is a finding. If the NTP process is found, then check the "ntp.conf" file for the "maxpoll" option setting: # grep maxpoll /etc/ntp.conf server 0.rhel.pool.ntp.org iburst maxpoll 16 If the "maxpoll" option is set to a number greater than 16 or the line is commented out, this is a finding. If the file does not exist, check the "/etc/cron.daily" subdirectory for a crontab file controlling the execution of the "ntpd -q" command. # grep -i "ntpd -q" /etc/cron.daily/* # ls -al /etc/cron.* | grep ntp ntp If a crontab file does not exist in the "/etc/cron.daily" that executes the "ntpd -q" command, this is a finding. If the "chronyd" process is found, then check the "chrony.conf" file for the "maxpoll" option setting: # grep maxpoll /etc/chrony.conf server 0.rhel.pool.ntp.org iburst maxpoll 16 If the option is not set or the line is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204605" severity="low" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Providing users with feedback on when account accesses last occurred facilitates user recognition and reporting of unauthorized account use.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72275</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify users are provided with feedback on when account accesses last occurred. Check that "pam_lastlog" is used and not silent with the following command: # grep pam_lastlog /etc/pam.d/postlogin session required pam_lastlog.so showfailed If "pam_lastlog" is missing from "/etc/pam.d/postlogin" file, or the silent option is present, this is a finding.</RawString> </Rule> <Rule id="V-204608" severity="low" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>To provide availability for name resolution services, multiple redundant name servers are mandated. A failure in name resolution could lead to the failure of security functions requiring name resolution, which may include time synchronization, centralized authentication, and remote system logging.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72281</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Determine whether the system is using local or DNS name resolution with the following command: # grep hosts /etc/nsswitch.conf hosts: files dns If the DNS entry is missing from the host's line in the "/etc/nsswitch.conf" file, the "/etc/resolv.conf" file must be empty. Verify the "/etc/resolv.conf" file is empty with the following command: # ls -al /etc/resolv.conf -rw-r--r-- 1 root root 0 Aug 19 08:31 resolv.conf If local host authentication is being used and the "/etc/resolv.conf" file is not empty, this is a finding. If the DNS entry is found on the host's line of the "/etc/nsswitch.conf" file, verify the operating system is configured to use two or more name servers for DNS resolution. Determine the name servers used by the system with the following command: # grep nameserver /etc/resolv.conf nameserver 192.168.1.2 nameserver 192.168.1.3 If less than two lines are returned that are not commented out, this is a finding. Verify that the "/etc/resolv.conf" file is immutable with the following command: # sudo lsattr /etc/resolv.conf ----i----------- /etc/resolv.conf If the file is mutable and has not been documented with the Information System Security Officer (ISSO), this is a finding.</RawString> </Rule> <Rule id="V-204618" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Network interfaces in promiscuous mode allow for the capture of all network traffic visible to the system. If unauthorized individuals can access these applications, it may allow then to collect information such as logon IDs, passwords, and key exchanges between systems. If the system is being used to perform a network troubleshooting function, the use of these tools must be documented with the Information System Security Officer (ISSO) and restricted to only authorized personnel.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72295</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify network interfaces are not in promiscuous mode unless approved by the ISSO and documented. Check for the status with the following command: # ip link | grep -i promisc If network interfaces are found on the system in promiscuous mode and their use has not been approved by the ISSO and documented, this is a finding.</RawString> </Rule> <Rule id="V-204624" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Internet services that are not required for system or application processes must not be active to decrease the attack surface of the system. Graphical display managers have a long history of security vulnerabilities and must not be used unless approved and documented.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72307</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the system is configured to boot to the command line: $ systemctl get-default multi-user.target If the system default target is not set to "multi-user.target" and the Information System Security Officer (ISSO) lacks a documented requirement for a graphical user interface, this is a finding. Verify a graphical user interface is not installed: $ rpm -qa | grep xorg | grep server Ask the System Administrator if use of a graphical user interface is an operational requirement. If the use of a graphical user interface on the system is not documented with the ISSO, this is a finding. </RawString> </Rule> <Rule id="V-204629" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>IP tunneling mechanisms can be used to bypass network filtering. If tunneling is required, it must be documented with the Information System Security Officer (ISSO).</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72317</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the system does not have unauthorized IP tunnels configured. Check to see if "libreswan" is installed with the following command: # yum list installed libreswan libreswan.x86-64 3.20-5.el7_4 If "libreswan" is installed, check to see if the "IPsec" service is active with the following command: # systemctl status ipsec ipsec.service - Internet Key Exchange (IKE) Protocol Daemon for IPsec Loaded: loaded (/usr/lib/systemd/system/ipsec.service; disabled) Active: inactive (dead) If the "IPsec" service is active, check to see if any tunnels are configured in "/etc/ipsec.conf" and "/etc/ipsec.d/" with the following commands: # grep -iw conn /etc/ipsec.conf /etc/ipsec.d/*.conf If there are indications that a "conn" parameter is configured for a tunnel, ask the System Administrator if the tunnel is documented with the ISSO. If "libreswan" is installed, "IPsec" is active, and an undocumented tunnel is active, this is a finding.</RawString> </Rule> <Rule id="V-204632" severity="medium" conversionstatus="pass" title="SRG-OS-000375-GPOS-00160" dscresource="None"> <Description><VulnDiscussion>Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the information system is compromised, that compromise will not affect credentials stored on the authentication device. Multifactor solutions that require devices separate from information systems gaining access include, for example, hardware tokens providing time-based or challenge-response authenticators and smart cards such as the U.S. Government Personal Identity Verification card and the DoD Common Access Card. A privileged account is defined as an information system account with authorizations of a privileged user. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. This requirement only applies to components where this is specific to the function of the device or has the concept of an organizational user (e.g., VPN, proxy capability). This does not apply to authentication for the purpose of configuring the device itself (management). Satisfies: SRG-OS-000375-GPOS-00160, SRG-OS-000375-GPOS-00161, SRG-OS-000375-GPOS-00162</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72427</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system implements multifactor authentication for remote access to privileged accounts via pluggable authentication modules (PAM). Check the "/etc/sssd/sssd.conf" file for the authentication services that are being used with the following command: # grep services /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf services = nss, pam If the "pam" service is not present on all "services" lines, this is a finding.</RawString> </Rule> <Rule id="V-204633" severity="medium" conversionstatus="pass" title="SRG-OS-000375-GPOS-00160" dscresource="None"> <Description><VulnDiscussion>Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the information system is compromised, that compromise will not affect credentials stored on the authentication device. Multifactor solutions that require devices separate from information systems gaining access include, for example, hardware tokens providing time-based or challenge-response authenticators and smart cards such as the U.S. Government Personal Identity Verification card and the DoD Common Access Card. A privileged account is defined as an information system account with authorizations of a privileged user. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. This requirement only applies to components where this is specific to the function of the device or has the concept of an organizational user (e.g., VPN, proxy capability). This does not apply to authentication for the purpose of configuring the device itself (management). Satisfies: SRG-OS-000375-GPOS-00160, SRG-OS-000375-GPOS-00161, SRG-OS-000375-GPOS-00162</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72433</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system implements certificate status checking for PKI authentication. Check to see if Online Certificate Status Protocol (OCSP) is enabled on the system with the following command: # grep cert_policy /etc/pam_pkcs11/pam_pkcs11.conf | grep -v "^#" cert_policy = ca, ocsp_on, signature; cert_policy = ca, ocsp_on, signature; cert_policy = ca, ocsp_on, signature; There should be at least three lines returned. If "ocsp_on" is not present in all uncommented "cert_policy" lines in "/etc/pam_pkcs11/pam_pkcs11.conf", this is a finding.</RawString> </Rule> <Rule id="V-204634" severity="medium" conversionstatus="pass" title="SRG-OS-000424-GPOS-00188" dscresource="None"> <Description><VulnDiscussion>The use of wireless networking can introduce many different attack vectors into the organization's network. Common attack vectors such as malicious association and ad hoc networks will allow an attacker to spoof a wireless access point (AP), allowing validated systems to connect to the malicious AP and enabling the attacker to monitor and record network traffic. These malicious APs can also serve to create a man-in-the-middle attack or be used to create a denial of service to valid network resources.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-73177</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that there are no wireless interfaces configured on the system. This is N/A for systems that do not have wireless network adapters. Check for the presence of active wireless interfaces with the following command: # nmcli device DEVICE TYPE STATE eth0 ethernet connected wlp3s0 wifi disconnected lo loopback unmanaged If a wireless interface is configured and its use on the system is not documented with the Information System Security Officer (ISSO), this is a finding.</RawString> </Rule> <Rule id="V-228564" severity="medium" conversionstatus="pass" title="SRG-OS-000057-GPOS-00027" dscresource="None"> <Description><VulnDiscussion>If audit information were to become compromised, then forensic analysis and discovery of the true source of potentially malicious system activity is impossible to achieve. To ensure the veracity of audit information, the operating system must protect audit information from unauthorized modification. Audit information includes all information (e.g., audit records, audit settings, audit reports) needed to successfully audit information system activity. Satisfies: SRG-OS-000057-GPOS-00027, SRG-OS-000058-GPOS-00028, SRG-OS-000059-GPOS-00029, SRG-OS-000206-GPOS-00084</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system audit records have proper permissions and ownership. List the full permissions and ownership of the audit log files with the following command. # ls -la /var/log/audit total 4512 drwx------. 2 root root 23 Apr 25 16:53 . drwxr-xr-x. 17 root root 4096 Aug 9 13:09 .. -rw-------. 1 root root 8675309 Aug 9 12:54 audit.log Audit logs must be mode 0600 or less permissive. If any are more permissive, this is a finding. The owner and group owner of all audit log files must both be "root". If any other owner or group owner is listed, this is a finding.</RawString> </Rule> <Rule id="V-250312" severity="medium" conversionstatus="pass" title="SRG-OS-000324-GPOS-00125" dscresource="None"> <Description><VulnDiscussion>Preventing non-privileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges. Privileged functions include, for example, establishing accounts, performing system integrity checks, or administering cryptographic key management activities. Non-privileged users are individuals who do not possess appropriate authorizations. Circumventing intrusion detection and prevention mechanisms or malicious code protection mechanisms are examples of privileged functions that require protection from non-privileged users.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Note: Per OPORD 16-0080, the preferred endpoint security tool is Endpoint Security for Linux (ENSL) in conjunction with SELinux. Verify the operating system confines SELinux users to roles that conform to least privilege. Check the SELinux User list to SELinux Roles mapping by using the following command: $ sudo semanage user -l SELinuxUser LabelingPrefix MLS/MCSLevel MLS/MCSRange SELinuxRoles guest_u user s0 s0 guest_r root user s0 s0-s0:c0.c1023 staff_r sysadm_r system_r unconfined_r staff_u user s0 s0-s0:c0.c1023 staff_r sysadm_r sysadm_u user s0 s0-s0:c0.c1023 sysadm_r system_u user s0 s0-s0:c0.c1023 system_r unconfined_r unconfined_u user s0 s0-s0:c0.c1023 system_r unconfined_r user_u user s0 s0 user_r xguest_u user s0 s0 xguest_r If the output differs from the above example, ask the SA to demonstrate how the SELinux User mappings are exercising least privilege. If deviations from the example are not documented with the ISSO and do not demonstrate least privilege, this is a finding.</RawString> </Rule> <Rule id="V-250313" severity="medium" conversionstatus="pass" title="SRG-OS-000324-GPOS-00125" dscresource="None"> <Description><VulnDiscussion>Preventing non-privileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges. Privileged functions include, for example, establishing accounts, performing system integrity checks, or administering cryptographic key management activities. Non-privileged users are individuals who do not possess appropriate authorizations. Circumventing intrusion detection and prevention mechanisms or malicious code protection mechanisms are examples of privileged functions that require protection from non-privileged users.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Note: Per OPORD 16-0080, the preferred endpoint security tool is Endpoint Security for Linux (ENSL) in conjunction with SELinux. Verify the operating system prevents privileged accounts from utilizing SSH. Check the SELinux ssh_sysadm_login boolean with the following command: $ sudo getsebool ssh_sysadm_login ssh_sysadm_login --> off If the "ssh_sysadm_login" boolean is not "off" and is not documented with the ISSO as an operational requirement, this is a finding.</RawString> </Rule> <Rule id="V-251704" severity="medium" conversionstatus="pass" title="SRG-OS-000373-GPOS-00156" dscresource="None"> <Description><VulnDiscussion>Without re-authentication, users may access resources or perform tasks for which they do not have authorization. When operating systems provide the capability to escalate a functional capability, it is critical the user re-authenticate. Satisfies: SRG-OS-000373-GPOS-00156, SRG-OS-000373-GPOS-00157, SRG-OS-000373-GPOS-00158</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system is not be configured to bypass password requirements for privilege escalation. Check the configuration of the "/etc/pam.d/sudo" file with the following command: $ sudo grep pam_succeed_if /etc/pam.d/sudo If any occurrences of "pam_succeed_if" is returned from the command, this is a finding.</RawString> </Rule> <Rule id="V-255927" severity="low" conversionstatus="pass" title="SRG-OS-000138-GPOS-00069" dscresource="None"> <Description><VulnDiscussion>Restricting access to the kernel message buffer limits access only to root. This prevents attackers from gaining additional system information as a non-privileged user.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system is configured to restrict access to the kernel message buffer with the following commands: $ sudo sysctl kernel.dmesg_restrict kernel.dmesg_restrict = 1 If "kernel.dmesg_restrict" is not set to "1" or is missing, this is a finding. Check that the configuration files are present to enable this kernel parameter: $ sudo grep -r kernel.dmesg_restrict /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null /etc/sysctl.conf:kernel.dmesg_restrict = 1 /etc/sysctl.d/99-sysctl.conf:kernel.dmesg_restrict = 1 If "kernel.dmesg_restrict" is not set to "1", is missing or commented out, this is a finding. If conflicting results are returned, this is a finding.</RawString> </Rule> </DocumentRule> <ManualRule dscresourcemodule="None"> <Rule id="V-204394" severity="medium" conversionstatus="pass" title="SRG-OS-000023-GPOS-00006" dscresource="None"> <Description><VulnDiscussion>Display of a standardized and approved use notification before granting access to the operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. System use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist. The banner must be formatted in accordance with applicable DoD policy. "You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details." Satisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000024-GPOS-00007, SRG-OS-000228-GPOS-00088</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71861</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system displays the approved Standard Mandatory DoD Notice and Consent Banner before granting access to the operating system via a graphical user logon. Note: If the system does not have a Graphical User Interface installed, this requirement is Not Applicable. Check that the operating system displays the exact approved Standard Mandatory DoD Notice and Consent Banner text with the command: # grep banner-message-text /etc/dconf/db/local.d/* banner-message-text= 'You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only.\nBy using this IS (which includes any device attached to this IS), you consent to the following conditions:\n-The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations.\n-At any time, the USG may inspect and seize data stored on this IS.\n-Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose.\n-This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy.\n-Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details. ' Note: The "\n " characters are for formatting only. They will not be displayed on the Graphical User Interface. If the banner does not match the approved Standard Mandatory DoD Notice and Consent Banner, this is a finding.</RawString> </Rule> <Rule id="V-204419" severity="medium" conversionstatus="pass" title="SRG-OS-000075-GPOS-00043" dscresource="None"> <Description><VulnDiscussion>Enforcing a minimum password lifetime helps to prevent repeated password changes to defeat the password reuse or history enforcement requirement. If users are allowed to immediately and continually change their password, the password could be repeatedly changed in a short period of time to defeat the organization's policy regarding password reuse.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71927</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Check whether the minimum time period between password changes for each user account is one day or greater. # awk -F: '$4 < 1 {print $1 " " $4}' /etc/shadow If any results are returned that are not associated with a system account, this is a finding.</RawString> </Rule> <Rule id="V-204421" severity="medium" conversionstatus="pass" title="SRG-OS-000076-GPOS-00044" dscresource="None"> <Description><VulnDiscussion>Any password, no matter how complex, can eventually be cracked. Therefore, passwords need to be changed periodically. If the operating system does not limit the lifetime of passwords and force users to change their passwords, there is the risk that the operating system passwords could be compromised.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71931</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Check whether the maximum time period for existing passwords is restricted to 60 days. # awk -F: '$5 > 60 {print $1 " " $5}' /etc/shadow If any results are returned that are not associated with a system account, this is a finding. </RawString> </Rule> <Rule id="V-204430" severity="medium" conversionstatus="pass" title="SRG-OS-000373-GPOS-00156" dscresource="None"> <Description><VulnDiscussion>Without re-authentication, users may access resources or perform tasks for which they do not have authorization. When operating systems provide the capability to escalate a functional capability, it is critical the user reauthenticate. Satisfies: SRG-OS-000373-GPOS-00156, SRG-OS-000373-GPOS-00157, SRG-OS-000373-GPOS-00158</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71949</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system requires users to reauthenticate for privilege escalation. Check the configuration of the "/etc/sudoers" and "/etc/sudoers.d/*" files with the following command: # grep -i authenticate /etc/sudoers /etc/sudoers.d/* If any uncommented line is found with a "!authenticate" tag, this is a finding.</RawString> </Rule> <Rule id="V-204441" severity="medium" conversionstatus="pass" title="SRG-OS-000104-GPOS-00051" dscresource="None"> <Description><VulnDiscussion>To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to prevent potential misuse and compromise of the system. Organizational users include organizational employees or individuals the organization deems to have equivalent status of employees (e.g., contractors). Organizational users (and processes acting on behalf of users) must be uniquely identified and authenticated to all accesses, except for the following: 1) Accesses explicitly identified and documented by the organization. Organizations document specific user actions that can be performed on the information system without identification or authentication; and 2) Accesses that occur through authorized use of group authenticators without individual authentication. Organizations may require unique identification of individuals in group accounts (e.g., shared privilege accounts) or for detailed accountability of individual activity. Satisfies: SRG-OS-000104-GPOS-00051, SRG-OS-000106-GPOS-00053, SRG-OS-000107-GPOS-00054, SRG-OS-000109-GPOS-00056, SRG-OS-000108-GPOS-00055, SRG-OS-000108-GPOS-00057, SRG-OS-000108-GPOS-00058</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71965</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system requires multifactor authentication to uniquely identify organizational users using multifactor authentication. Check to see if smartcard authentication is enforced on the system: # authconfig --test | grep "pam_pkcs11 is enabled" If no results are returned, this is a finding. # authconfig --test | grep "smartcard removal action" If "smartcard removal action" is blank, this is a finding. # authconfig --test | grep "smartcard module" If any of the above checks are not configured, ask the administrator to indicate the AO-approved multifactor authentication in use and the configuration to support it. If there is no evidence of multifactor authentication, this is a finding.</RawString> </Rule> <Rule id="V-204445" severity="medium" conversionstatus="pass" title="SRG-OS-000363-GPOS-00150" dscresource="None"> <Description><VulnDiscussion>Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized access to the operating system. Changes to operating system configurations can have unintended side effects, some of which may be relevant to security. Detecting such changes and providing an automated response can help avoid unintended, negative consequences that could ultimately affect the security state of the operating system. The operating system's Information System Security Manager (ISSM)/Information System Security Officer (ISSO) and System Administrators (SAs) must be notified via email and/or monitoring system trap when there is an unauthorized modification of a configuration item.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71973</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system routinely checks the baseline configuration for unauthorized changes. Note: A file integrity tool other than Advanced Intrusion Detection Environment (AIDE) may be used, but the tool must be executed at least once per week. Check for the presence of a cron job running daily or weekly on the system that executes AIDE daily to scan for changes to the system baseline. The command used in the example will use a daily occurrence. Check the cron directories for a script file controlling the execution of the file integrity application. For example, if AIDE is installed on the system, use the following command: # ls -al /etc/cron.* | grep aide -rwxr-xr-x 1 root root 602 Mar 6 20:02 aide # grep aide /etc/crontab /var/spool/cron/root /etc/crontab: 30 04 * * * root /usr/sbin/aide --check /var/spool/cron/root: 30 04 * * * /usr/sbin/aide --check If the file integrity application does not exist, or a script file controlling the execution of the file integrity application does not exist, this is a finding.</RawString> </Rule> <Rule id="V-204446" severity="medium" conversionstatus="pass" title="SRG-OS-000363-GPOS-00150" dscresource="None"> <Description><VulnDiscussion>Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized access to the operating system. Changes to operating system configurations can have unintended side effects, some of which may be relevant to security. Detecting such changes and providing an automated response can help avoid unintended, negative consequences that could ultimately affect the security state of the operating system. The operating system's Information System Security Manager (ISSM)/Information System Security Officer (ISSO) and System Administrators (SAs) must be notified via email and/or monitoring system trap when there is an unauthorized modification of a configuration item.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71975</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system notifies designated personnel if baseline configurations are changed in an unauthorized manner. Note: A file integrity tool other than Advanced Intrusion Detection Environment (AIDE) may be used, but the tool must be executed and notify specified individuals via email or an alert. Check for the presence of a cron job running routinely on the system that executes AIDE to scan for changes to the system baseline. The commands used in the example will use a daily occurrence. Check the cron directories for a "crontab" script file controlling the execution of the file integrity application. For example, if AIDE is installed on the system, use the following command: # ls -al /etc/cron.* | grep aide -rwxr-xr-x 1 root root 602 Mar 6 20:02 aide # grep aide /etc/crontab /var/spool/cron/root /etc/crontab: 30 04 * * * root /usr/sbin/aide --check /var/spool/cron/root: 30 04 * * * /usr/sbin/aide --check AIDE does not have a configuration that will send a notification, so the cron job uses the mail application on the system to email the results of the file integrity run as in the following example: # more /etc/cron.daily/aide #!/bin/bash /usr/sbin/aide --check | /bin/mail -s "$HOSTNAME - Daily AIDE integrity check run" root@example_server_name.mil If the file integrity application does not notify designated personnel of changes, this is a finding.</RawString> </Rule> <Rule id="V-204455" severity="high" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>A locally logged-on user who presses Ctrl-Alt-Delete, when at the console, can reboot the system. If accidentally pressed, as could happen in the case of a mixed OS environment, this can create the risk of short-term loss of availability of systems due to unintentional reboot. In the GNOME graphical environment, risk of unintentional reboot from the Ctrl-Alt-Delete sequence is reduced because the user will be prompted before any action is taken.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71993</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system is not configured to reboot the system when Ctrl-Alt-Delete is pressed. Check that the ctrl-alt-del.target is masked and not active with the following command: $ sudo systemctl status ctrl-alt-del.target ctrl-alt-del.target Loaded: masked (/dev/null; bad) Active: inactive (dead) If the ctrl-alt-del.target is not masked, this is a finding. If the ctrl-alt-del.target is active, this is a finding.</RawString> </Rule> <Rule id="V-204458" severity="high" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>An operating system release is considered "supported" if the vendor continues to provide security patches for the product. With an unsupported release, it will not be possible to resolve security issues discovered in the system software. Red Hat offers the Extended Update Support (EUS) Add-On to a Red Hat Enterprise Linux subscription, for a fee, for those customers who wish to standardize on a specific minor release for an extended period. RHEL 7.7 marks the final minor release that EUS will be available, while 7.9 is the final minor release overall.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71997</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the version of the operating system is vendor supported. Check the version of the operating system with the following command: # cat /etc/redhat-release Red Hat Enterprise Linux Server release 7.9 (Maipo) Current End of Extended Update Support for RHEL 7.6 is 31 May 2021. Current End of Extended Update Support for RHEL 7.7 is 30 August 2021. Current End of Maintenance Support for RHEL 7.9 is 30 June 2024. If the release is not supported by the vendor, this is a finding.</RawString> </Rule> <Rule id="V-204461" severity="low" conversionstatus="pass" title="SRG-OS-000104-GPOS-00051" dscresource="None"> <Description><VulnDiscussion>If a user is assigned the GID of a group not existing on the system, and a group with the GID is subsequently created, the user may have unintended rights to any files associated with the group.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72003</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify all GIDs referenced in the "/etc/passwd" file are defined in the "/etc/group" file. Check that all referenced GIDs exist with the following command: # pwck -r If GIDs referenced in "/etc/passwd" file are returned as not defined in "/etc/group" file, this is a finding.</RawString> </Rule> <Rule id="V-204462" severity="high" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If an account other than root also has a User Identifier (UID) of "0", it has root authority, giving that account unrestricted access to the entire operating system. Multiple accounts with a UID of "0" afford an opportunity for potential intruders to guess a password for a privileged account.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72005</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Check the system for duplicate UID "0" assignments with the following command: # awk -F: '$3 == 0 {print $1}' /etc/passwd If any accounts other than root have a UID of "0", this is a finding.</RawString> </Rule> <Rule id="V-204463" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Unowned files and directories may be unintentionally inherited if a user is assigned the same User Identifier "UID" as the UID of the un-owned files.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72007</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify all files and directories on the system have a valid owner. Check the owner of all files and directories with the following command: Note: The value after -fstype must be replaced with the filesystem type. XFS is used as an example. # find / -fstype xfs -nouser If any files on the system do not have an assigned owner, this is a finding.</RawString> </Rule> <Rule id="V-204464" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Files without a valid group owner may be unintentionally inherited if a group is assigned the same Group Identifier (GID) as the GID of the files without a valid group owner.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72009</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify all files and directories on the system have a valid group. Check the owner of all files and directories with the following command: Note: The value after -fstype must be replaced with the filesystem type. XFS is used as an example. # find / -fstype xfs -nogroup If any files on the system do not have an assigned group, this is a finding.</RawString> </Rule> <Rule id="V-204467" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If local interactive users are not assigned a valid home directory, there is no place for the storage and control of files they should own. In addition, if a local interactive user has a home directory defined that does not exist, the user may be given access to the / directory as the current working directory upon logon. This could create a Denial of Service because the user would not be able to access their logon configuration files, and it may give them visibility to system files they normally would not be able to access.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72015</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify local interactive users on the system have a home directory assigned and the directory exists. Check the home directory assignment for all local interactive non-privileged users on the system with the following command: # awk -F: '($3>=1000)&&($7 !~ /nologin/){print $1, $3, $6}' /etc/passwd smithj 1001 /home/smithj Note: This may miss interactive users that have been assigned a privileged UID. Evidence of interactive use may be obtained from a number of log files containing system logon information. Check that all referenced home directories exist with the following command: # pwck -r user 'smithj': directory '/home/smithj' does not exist If any home directories referenced in "/etc/passwd" are returned as not defined, or if any interactive users do not have a home directory assigned, this is a finding.</RawString> </Rule> <Rule id="V-204468" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Excessive permissions on local interactive user home directories may allow unauthorized access to user files by other users.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72017</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the assigned home directory of all local interactive users has a mode of "0750" or less permissive. Check the home directory assignment for all non-privileged users on the system with the following command: Note: This may miss interactive users that have been assigned a privileged User Identifier (UID). Evidence of interactive use may be obtained from a number of log files containing system logon information. # ls -ld $(awk -F: '($3>=1000)&&($7 !~ /nologin/){print $6}' /etc/passwd) -rwxr-x--- 1 smithj users 18 Mar 5 17:06 /home/smithj If home directories referenced in "/etc/passwd" do not have a mode of "0750" or less permissive, this is a finding.</RawString> </Rule> <Rule id="V-204469" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If a local interactive user does not own their home directory, unauthorized users could access or modify the user's files, and the users may not be able to access their own files.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72019</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the assigned home directory of all local interactive users on the system exists. Check the home directory assignment for all local interactive users on the system with the following command: # ls -ld $(awk -F: '($3>=1000)&&($7 !~ /nologin/){print $6}' /etc/passwd) -rwxr-x--- 1 smithj users 18 Mar 5 17:06 /home/smithj If any home directories referenced in "/etc/passwd" are not owned by the interactive user, this is a finding.</RawString> </Rule> <Rule id="V-204470" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If the Group Identifier (GID) of a local interactive user's home directory is not the same as the primary GID of the user, this would allow unauthorized access to the user's files, and users that share the same group may not be able to access files that they legitimately should.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72021</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the assigned home directory of all local interactive users is group-owned by that user's primary GID. Check the home directory assignment for all local interactive users on the system with the following command: # ls -ld $(awk -F: '($3>=1000)&&($7 !~ /nologin/){print $6}' /etc/passwd) -rwxr-x--- 1 smithj users 13 Apr 1 04:20 /home/smithj Check the user's primary group with the following command: # grep $(grep smithj /etc/passwd | awk -F: '{print $4}') /etc/group users:x:250:smithj,marinc,chongt If the user home directory referenced in "/etc/passwd" is not group-owned by that user's primary GID, this is a finding.</RawString> </Rule> <Rule id="V-204471" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Unowned files and directories may be unintentionally inherited if a user is assigned the same User Identifier "UID" as the UID of the un-owned files.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72023</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify all files and directories in a local interactive user's home directory have a valid owner. Check the owner of all files and directories in a local interactive user's home directory with the following command: Note: The example will be for the user "smithj", who has a home directory of "/home/smithj". $ sudo ls -lLR /home/smithj -rw-r--r-- 1 smithj smithj 18 Mar 5 17:06 file1 -rw-r--r-- 1 smithj smithj 193 Mar 5 17:06 file2 -rw-r--r-- 1 smithj smithj 231 Mar 5 17:06 file3 If any files or directories are found without an owner, this is a finding.</RawString> </Rule> <Rule id="V-204472" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If a local interactive user's files are group-owned by a group of which the user is not a member, unintended users may be able to access them.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72025</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify all files and directories in a local interactive user home directory are group-owned by a group the user is a member of. Check the group owner of all files and directories in a local interactive user's home directory with the following command: Note: The example will be for the user "smithj", who has a home directory of "/home/smithj". # ls -lLR /<home directory>/<users home directory>/ -rw-r--r-- 1 smithj smithj 18 Mar 5 17:06 file1 -rw-r--r-- 1 smithj smithj 193 Mar 5 17:06 file2 -rw-r--r-- 1 smithj sa 231 Mar 5 17:06 file3 If any files are found with an owner different than the group home directory user, check to see if the user is a member of that group with the following command: # grep smithj /etc/group sa:x:100:juan,shelley,bob,smithj smithj:x:521:smithj If the user is not a member of a group that group owns file(s) in a local interactive user's home directory, this is a finding.</RawString> </Rule> <Rule id="V-204473" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If a local interactive user files have excessive permissions, unintended users may be able to access or modify them.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72027</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify all files and directories contained in a local interactive user home directory, excluding local initialization files, have a mode of "0750". Check the mode of all non-initialization files in a local interactive user home directory with the following command: Files that begin with a "." are excluded from this requirement. Note: The example will be for the user "smithj", who has a home directory of "/home/smithj". # ls -lLR /home/smithj -rwxr-x--- 1 smithj smithj 18 Mar 5 17:06 file1 -rwxr----- 1 smithj smithj 193 Mar 5 17:06 file2 -rw-r-x--- 1 smithj smithj 231 Mar 5 17:06 file3 If any files are found with a mode more permissive than "0750", this is a finding.</RawString> </Rule> <Rule id="V-204474" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Local initialization files are used to configure the user's shell environment upon logon. Malicious modification of these files could compromise accounts upon logon.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72029</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the local initialization files of all local interactive users are owned by that user. Check the home directory assignment for all non-privileged users on the system with the following command: Note: The example will be for the smithj user, who has a home directory of "/home/smithj". # awk -F: '($3>=1000)&&($7 !~ /nologin/){print $1, $3, $6}' /etc/passwd smithj 1000 /home/smithj Note: This may miss interactive users that have been assigned a privileged User Identifier (UID). Evidence of interactive use may be obtained from a number of log files containing system logon information. Check the owner of all local interactive user's initialization files with the following command: # ls -al /home/smithj/.[^.]* | more -rwxr-xr-x 1 smithj users 896 Mar 10 2011 .profile -rwxr-xr-x 1 smithj users 497 Jan 6 2007 .login -rwxr-xr-x 1 smithj users 886 Jan 6 2007 .something If all local interactive user's initialization files are not owned by that user or root, this is a finding.</RawString> </Rule> <Rule id="V-204475" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Local initialization files for interactive users are used to configure the user's shell environment upon logon. Malicious modification of these files could compromise accounts upon logon.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72031</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the local initialization files of all local interactive users are group-owned by that user's primary Group Identifier (GID). Check the home directory assignment for all non-privileged users on the system with the following command: Note: The example will be for the smithj user, who has a home directory of "/home/smithj" and a primary group of "users". # awk -F: '($4>=1000)&&($7 !~ /nologin/){print $1, $4, $6}' /etc/passwd smithj 1000 /home/smithj # grep 1000 /etc/group users:x:1000:smithj,jonesj,jacksons Note: This may miss interactive users that have been assigned a privileged User Identifier (UID). Evidence of interactive use may be obtained from a number of log files containing system logon information. Check the group owner of all local interactive user's initialization files with the following command: # ls -al /home/smithj/.[^.]* | more -rwxr-xr-x 1 smithj users 896 Mar 10 2011 .profile -rwxr-xr-x 1 smithj users 497 Jan 6 2007 .login -rwxr-xr-x 1 smithj users 886 Jan 6 2007 .something If all local interactive user's initialization files are not group-owned by that user's primary GID, this is a finding.</RawString> </Rule> <Rule id="V-204476" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Local initialization files are used to configure the user's shell environment upon logon. Malicious modification of these files could compromise accounts upon logon.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72033</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that all local initialization files have a mode of "0740" or less permissive. Check the mode on all local initialization files with the following command: Note: The example will be for the "smithj" user, who has a home directory of "/home/smithj". # ls -al /home/smithj/.[^.]* | more -rwxr----- 1 smithj users 896 Mar 10 2011 .profile -rwxr----- 1 smithj users 497 Jan 6 2007 .login -rwxr----- 1 smithj users 886 Jan 6 2007 .something If any local initialization files have a mode more permissive than "0740", this is a finding.</RawString> </Rule> <Rule id="V-204477" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>The executable search path (typically the PATH environment variable) contains a list of directories for the shell to search to find executables. If this path includes the current working directory (other than the user's home directory), executables in these directories may be executed instead of system commands. This variable is formatted as a colon-separated list of directories. If there is an empty entry, such as a leading or trailing colon or two consecutive colons, this is interpreted as the current working directory. If deviations from the default system search path for the local interactive user are required, they must be documented with the Information System Security Officer (ISSO).</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72035</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that all local interactive user initialization files' executable search path statements do not contain statements that will reference a working directory other than the user's home directory. Check the executable search path statement for all local interactive user initialization files in the user's home directory with the following commands: Note: The example will be for the smithj user, which has a home directory of "/home/smithj". # grep -i path= /home/smithj/.* /home/smithj/.bash_profile:PATH=$PATH:$HOME/.local/bin:$HOME/bin If any local interactive user initialization files have executable search path statements that include directories outside of their home directory, this is a finding.</RawString> </Rule> <Rule id="V-204478" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If user start-up files execute world-writable programs, especially in unprotected directories, they could be maliciously modified to destroy user files or otherwise compromise the system at the user level. If the system is compromised at the user level, it is easier to elevate privileges to eventually compromise the system at the root and network level.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72037</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that local initialization files do not execute world-writable programs. Check the system for world-writable files with the following command: # find / -xdev -perm -002 -type f -exec ls -ld {} \; | more For all files listed, check for their presence in the local initialization files with the following commands: Note: The example will be for a system that is configured to create users' home directories in the "/home" directory. # grep <file> /home/*/.* If any local initialization files are found to reference world-writable files, this is a finding.</RawString> </Rule> <Rule id="V-204479" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If an unauthorized or modified device is allowed to exist on the system, there is the possibility the system may perform unintended or unauthorized operations.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72039</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that all system device files are correctly labeled to prevent unauthorized modification. List all device files on the system that are incorrectly labeled with the following commands: Note: Device files are normally found under "/dev", but applications may place device files in other directories and may necessitate a search of the entire system. #find /dev -context *:device_t:* \( -type c -o -type b \) -printf "%p %Z\n" #find /dev -context *:unlabeled_t:* \( -type c -o -type b \) -printf "%p %Z\n" Note: There are device files, such as "/dev/vmci", that are used when the operating system is a host virtual machine. They will not be owned by a user on the system and require the "device_t" label to operate. These device files are not a finding. If there is output from either of these commands, other than already noted, this is a finding.</RawString> </Rule> <Rule id="V-204480" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>The "nosuid" mount option causes the system to not execute setuid and setgid files with owner privileges. This option must be used for mounting any file system not containing approved setuid and setguid files. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72041</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify file systems that contain user home directories are mounted with the "nosuid" option. Find the file system(s) that contain the user home directories with the following command: Note: If a separate file system has not been created for the user home directories (user home directories are mounted under "/"), this is not a finding as the "nosuid" option cannot be used on the "/" system. # awk -F: '($3>=1000)&&($7 !~ /nologin/){print $1, $3, $6}' /etc/passwd smithj 1001 /home/smithj thomasr 1002 /home/thomasr Check the file systems that are mounted at boot time with the following command: # more /etc/fstab UUID=a411dc99-f2a1-4c87-9e05-184977be8539 /home ext4 rw,relatime,discard,data=ordered,nosuid 0 2 If a file system found in "/etc/fstab" refers to the user home directory file system and it does not have the "nosuid" option set, this is a finding.</RawString> </Rule> <Rule id="V-204481" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>The "nosuid" mount option causes the system to not execute "setuid" and "setgid" files with owner privileges. This option must be used for mounting any file system not containing approved "setuid" and "setguid" files. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72043</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify file systems that are used for removable media are mounted with the "nosuid" option. Check the file systems that are mounted at boot time with the following command: # more /etc/fstab UUID=2bc871e4-e2a3-4f29-9ece-3be60c835222 /mnt/usbflash vfat noauto,owner,ro,nosuid 0 0 If a file system found in "/etc/fstab" refers to removable media and it does not have the "nosuid" option set, this is a finding.</RawString> </Rule> <Rule id="V-204482" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>The "nosuid" mount option causes the system to not execute "setuid" and "setgid" files with owner privileges. This option must be used for mounting any file system not containing approved "setuid" and "setguid" files. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72045</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify file systems that are being NFS imported are configured with the "nosuid" option. Find the file system(s) that contain the directories being exported with the following command: # more /etc/fstab | grep nfs UUID=e06097bb-cfcd-437b-9e4d-a691f5662a7d /store nfs rw,nosuid 0 0 If a file system found in "/etc/fstab" refers to NFS and it does not have the "nosuid" option set, this is a finding. Verify the NFS is mounted with the "nosuid" option: # mount | grep nfs | grep nosuid If no results are returned, this is a finding.</RawString> </Rule> <Rule id="V-204486" severity="low" conversionstatus="pass" title="SRG-OS-000368-GPOS-00154" dscresource="None"> <Description><VulnDiscussion>The "noexec" mount option causes the system to not execute binary files. This option must be used for mounting any file system not containing approved binary files as they may be incompatible. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access. The "nodev" mount option causes the system to not interpret character or block special devices. Executing character or block special devices from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access. The "nosuid" mount option causes the system to not execute "setuid" and "setgid" files with owner privileges. This option must be used for mounting any file system not containing approved "setuid" and "setguid" files. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-81013</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that the "nodev","nosuid", and "noexec" options are configured for /dev/shm: # cat /etc/fstab | grep /dev/shm tmpfs /dev/shm tmpfs defaults,nodev,nosuid,noexec 0 0 If results are returned and the "nodev", "nosuid", or "noexec" options are missing, this is a finding. Verify "/dev/shm" is mounted with the "nodev", "nosuid", and "noexec" options: # mount | grep /dev/shm tmpfs on /dev/shm type tmpfs (rw,nodev,nosuid,noexec,seclabel) If /dev/shm is mounted without secure options "nodev", "nosuid", and "noexec", this is a finding.</RawString> </Rule> <Rule id="V-204487" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If a world-writable directory is not group-owned by root, sys, bin, or an application Group Identifier (GID), unauthorized users may be able to modify files created by others. The only authorized public directories are those temporary directories supplied with the system or those designed to be temporary file repositories. The setting is normally reserved for directories used by the system and by users for temporary file storage, (e.g., /tmp), and for directories requiring global read/write access.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72047</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>The following command will discover and print world-writable directories that are not group-owned by a system account, assuming only system accounts have a GID lower than 1000. Run it once for each local partition [PART]: # find [PART] -xdev -type d -perm -0002 -gid +999 -print If there is output, this is a finding.</RawString> </Rule> <Rule id="V-204490" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If the owner of the "cron.allow" file is not set to root, the possibility exists for an unauthorized user to view or to edit sensitive information.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72053</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that the "cron.allow" file is owned by root. Check the owner of the "cron.allow" file with the following command: # ls -al /etc/cron.allow -rw------- 1 root root 6 Mar 5 2011 /etc/cron.allow If the "cron.allow" file exists and has an owner other than root, this is a finding.</RawString> </Rule> <Rule id="V-204491" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If the group owner of the "cron.allow" file is not set to root, sensitive information could be viewed or edited by unauthorized users.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72055</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that the "cron.allow" file is group-owned by root. Check the group owner of the "cron.allow" file with the following command: # ls -al /etc/cron.allow -rw------- 1 root root 6 Mar 5 2011 /etc/cron.allow If the "cron.allow" file exists and has a group owner other than root, this is a finding.</RawString> </Rule> <Rule id="V-204493" severity="low" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72059</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that a separate file system/partition has been created for non-privileged local interactive user home directories. Check the home directory assignment for all non-privileged users (those with a UID of 1000 or greater) on the system with the following command: # awk -F: '($3>=1000)&&($7 !~ /nologin/){print $1, $3, $6, $7}' /etc/passwd adamsj 1000 /home/adamsj /bin/bash jacksonm 1001 /home/jacksonm /bin/bash smithj 1002 /home/smithj /bin/bash The output of the command will give the directory/partition that contains the home directories for the non-privileged users on the system (in this example, /home) and users' shell. All accounts with a valid shell (such as /bin/bash) are considered interactive users. Check that a file system/partition has been created for the non-privileged interactive users with the following command: Note: The partition of /home is used in the example. # grep /home /etc/fstab UUID=333ada18 /home ext4 noatime,nobarrier,nodev 1 2 If a separate entry for the file system/partition that contains the non-privileged interactive users' home directories does not exist, this is a finding.</RawString> </Rule> <Rule id="V-204494" severity="low" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72061</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that a separate file system/partition has been created for "/var". Check that a file system/partition has been created for "/var" with the following command: # grep /var /etc/fstab UUID=c274f65f /var ext4 noatime,nobarrier 1 2 If a separate entry for "/var" is not in use, this is a finding.</RawString> </Rule> <Rule id="V-204495" severity="low" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72063</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Determine if the operating system is configured to have the "/var/log/audit" path is on a separate file system. # grep /var/log/audit /etc/fstab If no result is returned, or the operating system is not configured to have "/var/log/audit" on a separate file system, this is a finding. Verify that "/var/log/audit" is mounted on a separate file system: # mount | grep "/var/log/audit" If no result is returned, or "/var/log/audit" is not on a separate file system, this is a finding.</RawString> </Rule> <Rule id="V-204499" severity="low" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Extended attributes in file systems are used to contain arbitrary data and file metadata with security implications.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72071</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the file integrity tool is configured to verify extended attributes. Note: AIDE is highly configurable at install time. These commands assume the "aide.conf" file is under the "/etc" directory. Use the following command to determine if the file is in another location: # find / -name aide.conf Check the "aide.conf" file to determine if the "xattrs" rule has been added to the rule list being applied to the files and directories selection lists. An example rule that includes the "xattrs" rule follows: All= p+i+n+u+g+s+m+S+sha512+acl+xattrs+selinux /bin All # apply the custom rule to the files in bin /sbin All # apply the same custom rule to the files in sbin If the "xattrs" rule is not being used on all uncommented selection lines in the "/etc/aide.conf" file, or extended attributes are not being checked by another file integrity tool, this is a finding.</RawString> </Rule> <Rule id="V-204500" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>File integrity tools use cryptographic hashes for verifying file contents and directories have not been altered. These hashes must be FIPS 140-2 approved cryptographic hashes. Red Hat Enterprise Linux operating system installation media ships with an optional file integrity tool called Advanced Intrusion Detection Environment (AIDE). AIDE is highly configurable at install time. This requirement assumes the "aide.conf" file is under the "/etc" directory.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72073</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the file integrity tool is configured to use FIPS 140-2-approved cryptographic hashes for validating file contents and directories. Note: AIDE is highly configurable at install time. These commands assume the "aide.conf" file is under the "/etc" directory. Use the following command to determine if the file is in another location: # find / -name aide.conf Check the "aide.conf" file to determine if the "sha512" rule has been added to the rule list being applied to the files and directories selection lists. Exclude any log files, or files expected to change frequently, to reduce unnecessary notifications. An example rule that includes the "sha512" rule follows: All=p+i+n+u+g+s+m+S+sha512+acl+xattrs+selinux /bin All # apply the custom rule to the files in bin /sbin All # apply the same custom rule to the files in sbin If the "sha512" rule is not being used on all uncommented selection lines in the "/etc/aide.conf" file, or another file integrity tool is not using FIPS 140-2-approved cryptographic hashes for validating file contents and directories, this is a finding.</RawString> </Rule> <Rule id="V-204574" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Sending rsyslog output to another system ensures that the logs cannot be removed or modified in the event that the system is compromised or has a hardware failure.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72209</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify "rsyslog" is configured to send all messages to a log aggregation server. Check the configuration of "rsyslog" with the following command: Note: If another logging package is used, substitute the utility configuration file for "/etc/rsyslog.conf". # grep @ /etc/rsyslog.conf /etc/rsyslog.d/*.conf *.* @@logagg.site.mil If there are no lines in the "/etc/rsyslog.conf" or "/etc/rsyslog.d/*.conf" files that contain the "@" or "@@" symbol(s), and the lines with the correct symbol(s) to send output to another system do not cover all "rsyslog" output, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or media. If the lines are commented out or there is no evidence that the audit logs are being sent to another system, this is a finding.</RawString> </Rule> <Rule id="V-204577" severity="medium" conversionstatus="pass" title="SRG-OS-000096-GPOS-00050" dscresource="None"> <Description><VulnDiscussion>In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must disable or restrict unused or unnecessary physical and logical ports/protocols on information systems. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services provided by default may not be necessary to support essential organizational operations. Additionally, it is sometimes convenient to provide multiple services from a single component (e.g., VPN and IPS); however, doing so increases risk over limiting the services provided by any one component. To support the requirements and principles of least functionality, the operating system must support the organizational requirements, providing only essential capabilities and limiting the use of ports, protocols, and/or services to only those required, authorized, and approved to conduct official business or to address authorized quality of life issues. Satisfies: SRG-OS-000096-GPOS-00050, SRG-OS-000297-GPOS-00115</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72219</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Inspect the firewall configuration and running services to verify that it is configured to prohibit or restrict the use of functions, ports, protocols, and/or services that are unnecessary or prohibited. Check which services are currently active with the following command: # firewall-cmd --list-all public (default, active) interfaces: enp0s3 sources: services: dhcpv6-client dns http https ldaps rpc-bind ssh ports: masquerade: no forward-ports: icmp-blocks: rich rules: Ask the System Administrator for the site or program PPSM CLSA. Verify the services allowed by the firewall match the PPSM CLSA. If there are additional ports, protocols, or services that are not in the PPSM CLSA, or there are ports, protocols, or services that are prohibited by the PPSM Category Assurance List (CAL), this is a finding.</RawString> </Rule> <Rule id="V-204583" severity="medium" conversionstatus="pass" title="SRG-OS-000250-GPOS-00093" dscresource="None"> <Description><VulnDiscussion>Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Cryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the key used to generate the hash.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72231</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>If LDAP is not being utilized, this requirement is Not Applicable. Verify the operating system implements cryptography to protect the integrity of remote LDAP access sessions. To determine if LDAP is being used for authentication, use the following command: # systemctl status sssd.service sssd.service - System Security Services Daemon Loaded: loaded (/usr/lib/systemd/system/sssd.service; enabled; vendor preset: disabled) Active: active (running) since Wed 2018-06-27 10:58:11 EST; 1h 50min ago If the "sssd.service" is "active", then LDAP is being used. Determine the "id_provider" that the LDAP is currently using: # grep -i "id_provider" /etc/sssd/sssd.conf id_provider = ad If "id_provider" is set to "ad", this is Not Applicable. Check the path to the X.509 certificate for peer authentication with the following command: # grep -i tls_cacert /etc/sssd/sssd.conf ldap_tls_cacert = /etc/pki/tls/certs/ca-bundle.crt Verify the "ldap_tls_cacert" option points to a file that contains the trusted CA certificate. If this file does not exist, or the option is commented out or missing, this is a finding.</RawString> </Rule> <Rule id="V-204596" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If a public host key file is modified by an unauthorized user, the SSH service may be compromised.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72255</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the SSH public host key files have mode "0644" or less permissive. Note: SSH public key files may be found in other directories on the system depending on the installation. The following command will find all SSH public key files on the system: # find /etc/ssh -name '*.pub' -exec ls -lL {} \; -rw-r--r-- 1 root root 618 Nov 28 06:43 ssh_host_dsa_key.pub -rw-r--r-- 1 root root 347 Nov 28 06:43 ssh_host_key.pub -rw-r--r-- 1 root root 238 Nov 28 06:43 ssh_host_rsa_key.pub If any file has a mode more permissive than "0644", this is a finding.</RawString> </Rule> <Rule id="V-204597" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If an unauthorized user obtains the private SSH host key file, the host could be impersonated.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72257</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the SSH private host key files have mode "0640" or less permissive. The following command will find all SSH private key files on the system and list their modes: # find / -name '*ssh_host*key' | xargs ls -lL -rw-r----- 1 root ssh_keys 112 Apr 1 11:59 ssh_host_dsa_key -rw-r----- 1 root ssh_keys 202 Apr 1 11:59 ssh_host_key -rw-r----- 1 root ssh_keys 352 Apr 1 11:59 ssh_host_rsa_key If any file has a mode more permissive than "0640", this is a finding.</RawString> </Rule> <Rule id="V-204606" severity="high" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>The .shosts files are used to configure host-based authentication for individual users or the system via SSH. Host-based authentication is not sufficient for preventing unauthorized access to the system, as it does not require interactive identification and authentication of a connection request, or for the use of two-factor authentication.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72277</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify there are no ".shosts" files on the system. Check the system for the existence of these files with the following command: # find / -name '*.shosts' If any ".shosts" files are found on the system, this is a finding.</RawString> </Rule> <Rule id="V-204607" severity="high" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>The shosts.equiv files are used to configure host-based authentication for the system via SSH. Host-based authentication is not sufficient for preventing unauthorized access to the system, as it does not require interactive identification and authentication of a connection request, or for the use of two-factor authentication.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72279</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify there are no "shosts.equiv" files on the system. Check the system for the existence of these files with the following command: # find / -name shosts.equiv If any "shosts.equiv" files are found on the system, this is a finding.</RawString> </Rule> <Rule id="V-204619" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If unrestricted mail relaying is permitted, unauthorized senders could use this host as a mail relay for the purpose of sending spam or other unauthorized activity.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72297</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the system is configured to prevent unrestricted mail relaying. Determine if "postfix" is installed with the following commands: # yum list installed postfix postfix-2.6.6-6.el7.x86_64.rpm If postfix is not installed, this is Not Applicable. If postfix is installed, determine if it is configured to reject connections from unknown or untrusted networks with the following command: # postconf -n smtpd_client_restrictions smtpd_client_restrictions = permit_mynetworks, reject If the "smtpd_client_restrictions" parameter contains any entries other than "permit_mynetworks" and "reject", this is a finding.</RawString> </Rule> <Rule id="V-204626" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>When an NFS server is configured to use RPCSEC_SYS, a selected userid and groupid are used to handle requests from the remote user. The userid and groupid could mistakenly or maliciously be set incorrectly. The RPCSEC_GSS method of authentication uses certificates on the server and client systems to more securely authenticate the remote mount request.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72311</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify "AUTH_GSS" is being used to authenticate NFS mounts. To check if the system is importing an NFS file system, look for any entries in the "/etc/fstab" file that have a file system type of "nfs" with the following command: # cat /etc/fstab | grep nfs 192.168.21.5:/mnt/export /data1 nfs4 rw,sync ,soft,sec=krb5:krb5i:krb5p If the system is mounting file systems via NFS and has the sec option without the "krb5:krb5i:krb5p" settings, the "sec" option has the "sys" setting, or the "sec" option is missing, this is a finding.</RawString> </Rule> <Rule id="V-204627" severity="high" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Whether active or not, default Simple Network Management Protocol (SNMP) community strings must be changed to maintain security. If the service is running with the default authenticators, anyone can gather data about the system and the network and use the information to potentially compromise the integrity of the system or network(s). It is highly recommended that SNMP version 3 user authentication and message encryption be used in place of the version 2 community strings.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72313</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that a system using SNMP is not using default community strings. Check to see if the "/etc/snmp/snmpd.conf" file exists with the following command: # ls -al /etc/snmp/snmpd.conf -rw------- 1 root root 52640 Mar 12 11:08 snmpd.conf If the file does not exist, this is Not Applicable. If the file does exist, check for the default community strings with the following commands: # grep public /etc/snmp/snmpd.conf # grep private /etc/snmp/snmpd.conf If either of these commands returns any output, this is a finding.</RawString> </Rule> <Rule id="V-204628" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If the systems access control program is not configured with appropriate rules for allowing and denying access to system network resources, services may be accessible to unauthorized hosts.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72315</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>If the "firewalld" package is not installed, ask the System Administrator (SA) if another firewall application (such as iptables) is installed. If an application firewall is not installed, this is a finding. Verify the system's access control program is configured to grant or deny system access to specific hosts. Check to see if "firewalld" is active with the following command: # systemctl status firewalld firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled) Active: active (running) since Sun 2014-04-20 14:06:46 BST; 30s ago If "firewalld" is active, check to see if it is configured to grant or deny access to specific hosts or services with the following commands: # firewall-cmd --get-default-zone public # firewall-cmd --list-all --zone=public public (active) target: default icmp-block-inversion: no interfaces: eth0 sources: services: mdns ssh ports: protocols: masquerade: no forward-ports: icmp-blocks: If "firewalld" is not active, determine whether "tcpwrappers" is being used by checking whether the "hosts.allow" and "hosts.deny" files are empty with the following commands: # ls -al /etc/hosts.allow rw-r----- 1 root root 9 Aug 2 23:13 /etc/hosts.allow # ls -al /etc/hosts.deny -rw-r----- 1 root root 9 Apr 9 2007 /etc/hosts.deny If "firewalld" and "tcpwrappers" are not installed, configured, and active, ask the SA if another access control program (such as iptables) is installed and active. Ask the SA to show that the running configuration grants or denies access to specific hosts or services. If "firewalld" is active and is not configured to grant access to specific hosts or "tcpwrappers" is not configured to grant or deny access to specific hosts, this is a finding.</RawString> </Rule> <Rule id="V-214799" severity="high" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Without cryptographic integrity protections, system command and files can be altered by unauthorized users without detection. Cryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the key used to generate the hash.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71855</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the cryptographic hash of system files and commands match the vendor values. Check the cryptographic hash of system files and commands with the following command: Note: System configuration files (indicated by a "c" in the second column) are expected to change over time. Unusual modifications should be investigated through the system audit log. # rpm -Va --noconfig | grep '^..5' If there is any output from the command for system files or binaries, this is a finding.</RawString> </Rule> <Rule id="V-214800" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Adding endpoint security tools can provide the capability to automatically take actions in response to malicious behavior, which can provide additional agility in reacting to network threats. These tools also often include a reporting capability to provide network awareness of the system, which may not otherwise exist in an organization's systems management regime.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-92255</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Per OPORD 16-0080, the preferred endpoint security tool is McAfee Endpoint Security for Linux (ENSL) in conjunction with SELinux. Procedure: Check that the following package has been installed: # rpm -qa | grep -i mcafeetp If the "mcafeetp" package is not installed, this is a finding. Verify that the daemon is running: # ps -ef | grep -i mfetpd If the daemon is not running, this is a finding.</RawString> </Rule> <Rule id="V-214801" severity="high" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>Virus scanning software can be used to protect a system from penetration from computer viruses and to limit their spread through intermediate systems. The virus scanning software should be configured to perform scans dynamically on accessed files. If this capability is not available, the system must be configured to scan, at a minimum, all altered files on the system on a daily basis. If the system processes inbound SMTP mail, the virus scanner must be configured to scan all received mail.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72213</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify an anti-virus solution is installed on the system. The anti-virus solution may be bundled with an approved host-based security solution. If there is no anti-virus solution installed on the system, this is a finding.</RawString> </Rule> <Rule id="V-214937" severity="medium" conversionstatus="pass" title="SRG-OS-000029-GPOS-00010" dscresource="None"> <Description><VulnDiscussion>A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence. The session lock is implemented at the point where session activity can be determined. The ability to enable/disable a session lock is given to the user by default. Disabling the user’s ability to disengage the graphical user interface session lock provides the assurance that all sessions will lock after the specified period of time.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-78995</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system prevents a user from overriding the screensaver lock-enabled setting for the graphical user interface. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Determine which profile the system database is using with the following command: # grep system-db /etc/dconf/profile/user system-db:local Check for the lock-enabled setting with the following command: Note: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used. # grep -i lock-enabled /etc/dconf/db/local.d/locks/* /org/gnome/desktop/screensaver/lock-enabled If the command does not return a result, this is a finding.</RawString> </Rule> <Rule id="V-219059" severity="medium" conversionstatus="pass" title="SRG-OS-000114-GPOS-00059" dscresource="None"> <Description><VulnDiscussion>Automatically mounting file systems permits easy introduction of unknown devices, thereby facilitating malicious activity. Satisfies: SRG-OS-000114-GPOS-00059, SRG-OS-000378-GPOS-00163, SRG-OS-000480-GPOS-00227</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-100023</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Note: If the operating system does not have a graphical user interface installed, this requirement is Not Applicable. Verify the operating system disables the ability to automount devices in a graphical user interface. Note: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used. Check to see if automounter service is disabled with the following commands: # cat /etc/dconf/db/local.d/00-No-Automount [org/gnome/desktop/media-handling] automount=false automount-open=false autorun-never=true If the output does not match the example above, this is a finding. # cat /etc/dconf/db/local.d/locks/00-No-Automount /org/gnome/desktop/media-handling/automount /org/gnome/desktop/media-handling/automount-open /org/gnome/desktop/media-handling/autorun-never If the output does not match the example, this is a finding.</RawString> </Rule> <Rule id="V-228563" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If a world-writable directory is not owned by root, sys, bin, or an application User Identifier (UID), unauthorized users may be able to modify files created by others. The only authorized public directories are those temporary directories supplied with the system or those designed to be temporary file repositories. The setting is normally reserved for directories used by the system and by users for temporary file storage, (e.g., /tmp), and for directories requiring global read/write access.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>The following command will discover and print world-writable directories that are not owned by a system account, assuming only system accounts have a UID lower than 1000. Run it once for each local partition [PART]: # find [PART] -xdev -type d -perm -0002 -uid +999 -print If there is output, this is a finding.</RawString> </Rule> <Rule id="V-237633" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>The sudo command allows a user to execute programs with elevated (administrator) privileges. It prompts the user for their password and confirms your request to execute a command by checking a file, called sudoers. If the "sudoers" file is not configured correctly, any user defined on the system can initiate privileged actions on the target system.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the "sudoers" file restricts sudo access to authorized personnel. $ sudo grep -iw 'ALL' /etc/sudoers /etc/sudoers.d/* If the either of the following entries are returned, this is a finding: ALL ALL=(ALL) ALL ALL ALL=(ALL:ALL) ALL</RawString> </Rule> <Rule id="V-251702" severity="high" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>If an account has an empty password, anyone could log on and run commands with the privileges of that account. Accounts with empty passwords should never be used in operational environments.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Check the "/etc/shadow" file for blank passwords with the following command: $ sudo awk -F: '!$2 {print $1}' /etc/shadow If the command returns any results, this is a finding.</RawString> </Rule> <Rule id="V-251703" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="None"> <Description><VulnDiscussion>The "sudo" command allows authorized users to run programs (including shells) as other users, system users, and root. The "/etc/sudoers" file is used to configure authorized "sudo" users as well as the programs they are allowed to run. Some configuration options in the "/etc/sudoers" file allow configured users to run programs without re-authenticating. Use of these configuration options makes it easier for one compromised account to be used to compromise other accounts. It is possible to include other sudoers files from within the sudoers file currently being parsed using the #include and #includedir directives. When sudo reaches this line it will suspend processing of the current file (/etc/sudoers) and switch to the specified file/directory. Once the end of the included file(s) is reached, the rest of /etc/sudoers will be processed. Files that are included may themselves include other files. A hard limit of 128 nested include files is enforced to prevent include file loops.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Note: If the "include" and "includedir" directives are not present in the /etc/sudoers file, this requirement is not applicable. Verify the operating system specifies only the default "include" directory for the /etc/sudoers file with the following command: $ sudo grep include /etc/sudoers #includedir /etc/sudoers.d If the results are not "/etc/sudoers.d" or additional files or directories are specified, this is a finding. Verify the operating system does not have nested "include" files or directories within the /etc/sudoers.d directory with the following command: $ sudo grep -r include /etc/sudoers.d If results are returned, this is a finding.</RawString> </Rule> <Rule id="V-251705" severity="medium" conversionstatus="pass" title="SRG-OS-000445-GPOS-00199" dscresource="None"> <Description><VulnDiscussion>Without verification of the security functions, security functions may not operate correctly, and the failure may go unnoticed. Security function is defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data on which the protection is based. Security functionality includes, but is not limited to, establishing system accounts, configuring access authorizations (i.e., permissions, privileges), setting events to be audited, and setting intrusion detection parameters. This requirement applies to the Red Hat Enterprise Linux operating system performing security function verification/testing and/or systems and environments that require this functionality.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that Advanced Intrusion Detection Environment (AIDE) is installed and verifies the correct operation of all security functions. Check that the AIDE package is installed with the following command: $ sudo rpm -q aide aide-0.15.1-13.el7.x86_64 If AIDE is not installed, ask the System Administrator how file integrity checks are performed on the system. If there is no application installed to perform integrity checks, this is a finding. If AIDE is installed, check if it has been initialized with the following command: $ sudo /usr/sbin/aide --check If the output is "Couldn't open file /var/lib/aide/aide.db.gz for reading", this is a finding.</RawString> </Rule> <Rule id="V-254523" severity="medium" conversionstatus="pass" title="SRG-OS-000123-GPOS-00064" dscresource="None"> <Description><VulnDiscussion>Temporary accounts are privileged or nonprivileged accounts that are established during pressing circumstances, such as new software or hardware configuration or an incident response, where the need for prompt account activation requires bypassing normal account authorization procedures. If any inactive temporary accounts are left enabled on the system and are not either manually removed or automatically expired within 72 hours, the security posture of the system will be degraded and exposed to exploitation by unauthorized users or insider threat actors. Temporary accounts are different from emergency accounts. Emergency accounts, also known as "last resort" or "break glass" accounts, are local logon accounts enabled on the system for emergency use by authorized system administrators to manage a system when standard logon methods are failing or not available. Emergency accounts are not subject to manual removal or scheduled expiration requirements. The automatic expiration of temporary accounts may be extended as needed by the circumstances but it must not be extended indefinitely. A documented permanent account should be established for privileged users who need long-term maintenance accounts.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify temporary accounts have been provisioned with an expiration date of 72 hours. For every existing temporary account, run the following command to obtain its account expiration information: $ sudo chage -l <temporary_account_name> | grep -i "account expires" Verify each of these accounts has an expiration date set within 72 hours. If any temporary accounts have no expiration date set or do not expire within 72 hours, this is a finding.</RawString> </Rule> <Rule id="V-255928" severity="medium" conversionstatus="pass" title="SRG-OS-000073-GPOS-00041" dscresource="None"> <Description><VulnDiscussion>When using the authconfig utility to modify authentication configuration settings, the "system-auth" and "password-auth" files and any custom settings that they may contain are overwritten. This can be avoided by creating new local configuration files and creating new or moving existing symbolic links to them. The authconfig utility will recognize the local configuration files and not overwrite them, while writing its own settings to the original configuration files.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify "system-auth" and "password-auth" files are symbolic links pointing to "system-auth-local" and "password-auth-local": $ sudo ls -l /etc/pam.d/{password,system}-auth lrwxrwxrwx. 1 root root 30 Apr 1 11:59 /etc/pam.d/password-auth -> /etc/pam.d/password-auth-local lrwxrwxrwx. 1 root root 28 Apr 1 11:59 /etc/pam.d/system-auth -> /etc/pam.d/system-auth-local If system-auth and password-auth files are not symbolic links, this is a finding. If system-auth and password-auth are symbolic links but do not point to "system-auth-local" and "password-auth-local", this is a finding.</RawString> </Rule> <Rule id="V-256968" severity="medium" conversionstatus="pass" title="SRG-OS-000366-GPOS-00153" dscresource="None"> <Description><VulnDiscussion>Cryptographic verification of vendor software packages ensures that all software packages are obtained from a valid source and protects against spoofing that could lead to installation of malware on the system. Red Hat cryptographically signs all software packages, which includes updates, with a GPG key to verify that they are valid.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Confirm Red Hat package-signing keys are installed on the system and verify their fingerprints match vendor values. Note: For Red Hat Enterprise Linux 7 software packages, Red Hat uses GPG keys labeled "release key 2" and "auxiliary key". The keys are defined in key file "/etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release" by default. List Red Hat GPG keys installed on the system: $ sudo rpm -q --queryformat "%{SUMMARY}\n" gpg-pubkey | grep -i "red hat" gpg(Red Hat, Inc. (release key 2) <security@redhat.com>) gpg(Red Hat, Inc. (auxiliary key) <security@redhat.com>) If Red Hat GPG keys "release key 2" and "auxiliary key" are not installed, this is a finding. List key fingerprints of installed Red Hat GPG keys: $ sudo gpg -q --with-fingerprint /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release If key file "/etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release" is missing, this is a finding. Example output: pub 4096R/FD431D51 2009-10-22 Red Hat, Inc. (release key 2) <security@redhat.com> Key fingerprint = 567E 347A D004 4ADE 55BA 8A5F 199E 2F91 FD43 1D51 pub 1024D/2FA658E0 2006-12-01 Red Hat, Inc. (auxiliary key) <security@redhat.com> Key fingerprint = 43A6 E49C 4A38 F4BE 9ABF 2A53 4568 9C88 2FA6 58E0 Compare key fingerprints of installed Red Hat GPG keys with fingerprints listed on Red Hat "Product Signing Keys" webpage at https://access.redhat.com/security/team/key. If key fingerprints do not match, this is a finding.</RawString> </Rule> <Rule id="V-256970" severity="medium" conversionstatus="pass" title="SRG-OS-000363-GPOS-00150" dscresource="None"> <Description><VulnDiscussion>Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized access to the operating system. Changes to operating system configurations can have unintended side effects, some of which may be relevant to security. Detecting such changes and providing an automated response can help avoid unintended, negative consequences that could ultimately affect the security state of the operating system. The operating system's IMO/ISSO and SAs must be notified via email and/or monitoring system trap when there is an unauthorized modification of a configuration item.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that the operating system is configured to allow sending email notifications. Note: The "mailx" package provides the "mail" command that is used to send email messages. Verify that the "mailx" package is installed on the system: $ sudo yum list installed mailx mailx.x86_64 12.5-19.el7 @rhel-7-server-rpms If "mailx" package is not installed, this is a finding.</RawString> </Rule> </ManualRule> <nxFileLineRule dscresourcemodule="nx"> <Rule id="V-204399.b" severity="medium" conversionstatus="pass" title="SRG-OS-000029-GPOS-00010" dscresource="nxFileLine"> <ContainsLine>/org/gnome/desktop/screensaver/lock-delay</ContainsLine> <Description><VulnDiscussion>A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*/org/gnome/desktop/screensaver/lock-delay</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/dconf/db/local.d/locks/session</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-73155.b</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system prevents a user from overriding a screensaver lock after a 15-minute period of inactivity for graphical user interfaces. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Determine which profile the system database is using with the following command: # grep system-db /etc/dconf/profile/user system-db:local Check for the lock delay setting with the following command: Note: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used. # grep -i lock-delay /etc/dconf/db/local.d/locks/* /org/gnome/desktop/screensaver/lock-delay If the command does not return a result, this is a finding.</RawString> </Rule> <Rule id="V-204400" severity="medium" conversionstatus="pass" title="SRG-OS-000029-GPOS-00010" dscresource="nxFileLine"> <ContainsLine>/org/gnome/desktop/session/idle-delay</ContainsLine> <Description><VulnDiscussion>A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*/org/gnome/desktop/session/idle-delay</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/dconf/db/local.d/locks/session</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-73157</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system prevents a user from overriding session idle delay after a 15-minute period of inactivity for graphical user interfaces. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Determine which profile the system database is using with the following command: # grep system-db /etc/dconf/profile/user system-db:local Check for the session idle delay setting with the following command: Note: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used. # grep -i idle-delay /etc/dconf/db/local.d/locks/* /org/gnome/desktop/session/idle-delay If the command does not return a result, this is a finding.</RawString> </Rule> <Rule id="V-204403" severity="medium" conversionstatus="pass" title="SRG-OS-000029-GPOS-00010" dscresource="nxFileLine"> <ContainsLine>/org/gnome/desktop/screensaver/idle-activation-enabled</ContainsLine> <Description><VulnDiscussion>A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence. The session lock is implemented at the point where session activity can be determined. The ability to enable/disable a session lock is given to the user by default. Disabling the user's ability to disengage the graphical user interface session lock provides the assurance that all sessions will lock after the specified period of time.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*/org/gnome/desktop/screensaver/idle-activation-enabled</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/dconf/db/local.d/locks/session</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-78997</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system prevents a user from overriding the screensaver idle-activation-enabled setting for the graphical user interface. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Determine which profile the system database is using with the following command: # grep system-db /etc/dconf/profile/user system-db:local Check for the idle-activation-enabled setting with the following command: Note: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used. # grep -i idle-activation-enabled /etc/dconf/db/local.d/locks/* /org/gnome/desktop/screensaver/idle-activation-enabled If the command does not return a result, this is a finding.</RawString> </Rule> <Rule id="V-204405" severity="medium" conversionstatus="pass" title="SRG-OS-000069-GPOS-00037" dscresource="nxFileLine"> <ContainsLine>password substack system-auth</ContainsLine> <Description><VulnDiscussion>Pluggable authentication modules (PAM) allow for a modular approach to integrating authentication methods. PAM operates in a top-down processing model and if the modules are not listed in the correct order, an important security function could be bypassed if stack entries are not centralized.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^\s*password(?:\t*|\s*)substack\tsystem-auth\s*$|^#\s*password\s*substack\s*system-auth.*</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/pam.d/passwd</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-81003</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that /etc/pam.d/passwd is configured to use /etc/pam.d/system-auth when changing passwords: # cat /etc/pam.d/passwd | grep -i substack | grep -i system-auth password substack system-auth If no results are returned, the line is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204407" severity="medium" conversionstatus="pass" title="SRG-OS-000069-GPOS-00037" dscresource="nxFileLine"> <ContainsLine>ucredit = -1</ContainsLine> <Description><VulnDiscussion>Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*ucredit.*$|^ucredit\s*=\s*(?!-1\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/security/pwquality.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71903</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Note: The value to require a number of upper-case characters to be set is expressed as a negative number in "/etc/security/pwquality.conf". Check the value for "ucredit" in "/etc/security/pwquality.conf" with the following command: # grep ucredit /etc/security/pwquality.conf ucredit = -1 If the value of "ucredit" is not set to a negative value, this is a finding.</RawString> </Rule> <Rule id="V-204408" severity="medium" conversionstatus="pass" title="SRG-OS-000070-GPOS-00038" dscresource="nxFileLine"> <ContainsLine>lcredit = -1</ContainsLine> <Description><VulnDiscussion>Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*lcredit.*$|^lcredit\s*=\s*(?!-1\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/security/pwquality.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71905</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Note: The value to require a number of lower-case characters to be set is expressed as a negative number in "/etc/security/pwquality.conf". Check the value for "lcredit" in "/etc/security/pwquality.conf" with the following command: # grep lcredit /etc/security/pwquality.conf lcredit = -1 If the value of "lcredit" is not set to a negative value, this is a finding.</RawString> </Rule> <Rule id="V-204409" severity="medium" conversionstatus="pass" title="SRG-OS-000071-GPOS-00039" dscresource="nxFileLine"> <ContainsLine>dcredit = -1</ContainsLine> <Description><VulnDiscussion>Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*dcredit.*$|^dcredit\s*=\s*(?!-1\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/security/pwquality.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71907</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Note: The value to require a number of numeric characters to be set is expressed as a negative number in "/etc/security/pwquality.conf". Check the value for "dcredit" in "/etc/security/pwquality.conf" with the following command: # grep dcredit /etc/security/pwquality.conf dcredit = -1 If the value of "dcredit" is not set to a negative value, this is a finding.</RawString> </Rule> <Rule id="V-204410" severity="medium" conversionstatus="pass" title="SRG-OS-000266-GPOS-00101" dscresource="nxFileLine"> <ContainsLine>ocredit=-1</ContainsLine> <Description><VulnDiscussion>Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*ocredit.*$|^ocredit\s*=\s*(?!-1)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/security/pwquality.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71909</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system enforces password complexity by requiring that at least one special character be used. Note: The value to require a number of special characters to be set is expressed as a negative number in "/etc/security/pwquality.conf". Check the value for "ocredit" in "/etc/security/pwquality.conf" with the following command: # grep ocredit /etc/security/pwquality.conf ocredit=-1 If the value of "ocredit" is not set to a negative value, this is a finding.</RawString> </Rule> <Rule id="V-204411" severity="medium" conversionstatus="pass" title="SRG-OS-000072-GPOS-00040" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/security/pwquality.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71911</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the following statement is true when leveraging the correct nxFileLine ContainsLine format: "If the value of "difok" is set to less than "8", this is a finding." </OrganizationValueTestString> <RawString>The "difok" option sets the number of characters in a password that must not be present in the old password. Check for the value of the "difok" option in "/etc/security/pwquality.conf" with the following command: # grep difok /etc/security/pwquality.conf difok = 8 If the value of "difok" is set to less than "8", this is a finding.</RawString> </Rule> <Rule id="V-204412" severity="medium" conversionstatus="pass" title="SRG-OS-000072-GPOS-00040" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/security/pwquality.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71913</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the following statement is true when leveraging the correct nxFileLine ContainsLine format: "If the value of "minclass" is set to less than "4", this is a finding." </OrganizationValueTestString> <RawString>The "minclass" option sets the minimum number of required classes of characters for the new password (digits, upper-case, lower-case, others). Check for the value of the "minclass" option in "/etc/security/pwquality.conf" with the following command: # grep minclass /etc/security/pwquality.conf minclass = 4 If the value of "minclass" is set to less than "4", this is a finding.</RawString> </Rule> <Rule id="V-204413" severity="medium" conversionstatus="pass" title="SRG-OS-000072-GPOS-00040" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/security/pwquality.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71915</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the following statement is true when leveraging the correct nxFileLine ContainsLine format: "If the value of "maxrepeat" is set to more than "3", this is a finding." </OrganizationValueTestString> <RawString>The "maxrepeat" option sets the maximum number of allowed same consecutive characters in a new password. Check for the value of the "maxrepeat" option in "/etc/security/pwquality.conf" with the following command: # grep maxrepeat /etc/security/pwquality.conf maxrepeat = 3 If the value of "maxrepeat" is set to more than "3", this is a finding.</RawString> </Rule> <Rule id="V-204414" severity="medium" conversionstatus="pass" title="SRG-OS-000072-GPOS-00040" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/security/pwquality.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71917</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the following statement is true when leveraging the correct nxFileLine ContainsLine format: If the value of "maxclassrepeat" is set to "0", more than "4" or is commented out, this is a finding.</OrganizationValueTestString> <RawString>The "maxclassrepeat" option sets the maximum number of allowed same consecutive characters in the same class in the new password. Check for the value of the "maxclassrepeat" option in "/etc/security/pwquality.conf" with the following command: $ sudo grep maxclassrepeat /etc/security/pwquality.conf maxclassrepeat = 4 If the value of "maxclassrepeat" is set to "0", more than "4" or is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204416" severity="medium" conversionstatus="pass" title="SRG-OS-000073-GPOS-00041" dscresource="nxFileLine"> <ContainsLine>ENCRYPT_METHOD SHA512</ContainsLine> <Description><VulnDiscussion>Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised. Passwords encrypted with a weak algorithm are no more protected than if they are kept in plain text.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*ENCRYPT_METHOD\s*SHA512</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/login.defs</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71921</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the system's shadow file is configured to store only encrypted representations of passwords. The strength of encryption that must be used to hash passwords for all accounts is SHA512. Check that the system is configured to create SHA512 hashed passwords with the following command: # grep -i encrypt /etc/login.defs ENCRYPT_METHOD SHA512 If the "/etc/login.defs" configuration file does not exist or allows for password hashes other than SHA512 to be used, this is a finding.</RawString> </Rule> <Rule id="V-204418" severity="medium" conversionstatus="pass" title="SRG-OS-000075-GPOS-00043" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>Enforcing a minimum password lifetime helps to prevent repeated password changes to defeat the password reuse or history enforcement requirement. If users are allowed to immediately and continually change their password, the password could be repeatedly changed in a short period of time to defeat the organization's policy regarding password reuse.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/login.defs</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71925</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the following statement is true when leveraging the correct nxFileLine ContainsLine format: "If the "PASS_MIN_DAYS" parameter value is not "1" or greater, or is commented out, this is a finding." </OrganizationValueTestString> <RawString>Verify the operating system enforces 24 hours/1 day as the minimum password lifetime for new user accounts. Check for the value of "PASS_MIN_DAYS" in "/etc/login.defs" with the following command: # grep -i pass_min_days /etc/login.defs PASS_MIN_DAYS 1 If the "PASS_MIN_DAYS" parameter value is not "1" or greater, or is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204420" severity="medium" conversionstatus="pass" title="SRG-OS-000076-GPOS-00044" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>Any password, no matter how complex, can eventually be cracked. Therefore, passwords need to be changed periodically. If the operating system does not limit the lifetime of passwords and force users to change their passwords, there is the risk that the operating system passwords could be compromised.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/login.defs</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71929</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the following statement is true when leveraging the correct nxFileLine ContainsLine format: "If the "PASS_MAX_DAYS" parameter value is not 60 or less, or is commented out, this is a finding." </OrganizationValueTestString> <RawString>If passwords are not being used for authentication, this is Not Applicable. Verify the operating system enforces a 60-day maximum password lifetime restriction for new user accounts. Check for the value of "PASS_MAX_DAYS" in "/etc/login.defs" with the following command: # grep -i pass_max_days /etc/login.defs PASS_MAX_DAYS 60 If the "PASS_MAX_DAYS" parameter value is not 60 or less, or is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204423" severity="medium" conversionstatus="pass" title="SRG-OS-000078-GPOS-00046" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>The shorter the password, the lower the number of possible combinations that need to be tested before the password is compromised. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password length is one factor of several that helps to determine strength and how long it takes to crack a password. Use of more characters in a password helps to exponentially increase the time and/or resources required to compromise the password.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/security/pwquality.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71935</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the following statement is true when leveraging the correct nxFileLine ContainsLine format: "If the command does not return a "minlen" value of 15 or greater, this is a finding." </OrganizationValueTestString> <RawString>Verify the operating system enforces a minimum 15-character password length. The "minlen" option sets the minimum number of characters in a new password. Check for the value of the "minlen" option in "/etc/security/pwquality.conf" with the following command: # grep minlen /etc/security/pwquality.conf minlen = 15 If the command does not return a "minlen" value of 15 or greater, this is a finding.</RawString> </Rule> <Rule id="V-204425" severity="high" conversionstatus="pass" title="SRG-OS-000106-GPOS-00053" dscresource="nxFileLine"> <ContainsLine>PermitEmptyPasswords no</ContainsLine> <Description><VulnDiscussion>Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*PermitEmptyPasswords.*$|^PermitEmptyPasswords\s*(?!no\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71939</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>To determine how the SSH daemon's "PermitEmptyPasswords" option is set, run the following command: # grep -i PermitEmptyPasswords /etc/ssh/sshd_config PermitEmptyPasswords no If no line, a commented line, or a line indicating the value "no" is returned, the required value is set. If the required value is not set, this is a finding.</RawString> </Rule> <Rule id="V-204426" severity="medium" conversionstatus="pass" title="SRG-OS-000118-GPOS-00060" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>Inactive identifiers pose a risk to systems and applications because attackers may exploit an inactive identifier and potentially obtain undetected access to the system. Owners of inactive accounts will not notice if unauthorized access to their user account has been obtained. Operating systems need to track periods of inactivity and disable application identifiers after 35 days of inactivity.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/default/useradd</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71941</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the following statement is true when leveraging the correct nxFileLine ContainsLine format: "If "INACTIVE" is set to "-1", a value greater than "35", is commented out, or is not defined, this is a finding." </OrganizationValueTestString> <RawString>If passwords are not being used for authentication, this is Not Applicable. Verify the operating system disables account identifiers (individuals, groups, roles, and devices) after the password expires with the following command: # grep -i inactive /etc/default/useradd INACTIVE=35 If "INACTIVE" is set to "-1", a value greater than "35", is commented out, or is not defined, this is a finding.</RawString> </Rule> <Rule id="V-204431" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00226" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>Configuring the operating system to implement organization-wide security implementation guides and security checklists verifies compliance with federal standards and establishes a common security baseline across DoD that reflects the most restrictive security posture consistent with operational requirements. Configuration settings are the set of parameters that can be changed in hardware, software, or firmware components of the system that affect the security posture and/or functionality of the system. Security-related parameters are those parameters impacting the security state of the system, including the parameters required to satisfy other security control requirements. Security-related parameters include, for example, registry settings; account, file, and directory permission settings; and settings for functions, ports, protocols, services, and remote connections.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/login.defs</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71951</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the following statement is true when leveraging the correct nxFileLine ContainsLine format: "If the value of "FAIL_DELAY" is not set to "4" or greater, or the line is commented out, this is a finding." </OrganizationValueTestString> <RawString>Verify the operating system enforces a delay of at least four seconds between console logon prompts following a failed logon attempt. Check the value of the "fail_delay" parameter in the "/etc/login.defs" file with the following command: # grep -i fail_delay /etc/login.defs FAIL_DELAY 4 If the value of "FAIL_DELAY" is not set to "4" or greater, or the line is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204434" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00229" dscresource="nxFileLine"> <ContainsLine>PermitUserEnvironment no</ContainsLine> <Description><VulnDiscussion>Failure to restrict system access to authenticated users negatively impacts operating system security.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*PermitUserEnvironment.*$|^PermitUserEnvironment\s*(?!no\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71957</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system does not allow users to override environment variables to the SSH daemon. Check for the value of the "PermitUserEnvironment" keyword with the following command: # grep -i permituserenvironment /etc/ssh/sshd_config PermitUserEnvironment no If the "PermitUserEnvironment" keyword is not set to "no", is missing, or is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204435" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00229" dscresource="nxFileLine"> <ContainsLine>HostbasedAuthentication no</ContainsLine> <Description><VulnDiscussion>Failure to restrict system access to authenticated users negatively impacts operating system security.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*HostbasedAuthentication.*$|^HostbasedAuthentication\s*(?!no\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71959</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system does not allow a non-certificate trusted host SSH logon to the system. Check for the value of the "HostbasedAuthentication" keyword with the following command: # grep -i hostbasedauthentication /etc/ssh/sshd_config HostbasedAuthentication no If the "HostbasedAuthentication" keyword is not set to "no", is missing, or is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204447" severity="high" conversionstatus="pass" title="SRG-OS-000366-GPOS-00153" dscresource="nxFileLine"> <ContainsLine>gpgcheck=1</ContainsLine> <Description><VulnDiscussion>Changes to any software components can have significant effects on the overall security of the operating system. This requirement ensures the software has not been tampered with and that it has been provided by a trusted vendor. Accordingly, patches, service packs, device drivers, or operating system components must be signed with a certificate recognized and approved by the organization. Verifying the authenticity of the software prior to installation validates the integrity of the patch or upgrade received from a vendor. This verifies the software has not been tampered with and that it has been provided by a trusted vendor. Self-signed certificates are disallowed by this requirement. The operating system should not have to verify the software again. This requirement does not mandate DoD certificates for this purpose; however, the certificate used to verify the software must be from an approved CA.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*gpgcheck\s*=\s*1</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/yum.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71977</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system prevents the installation of patches, service packs, device drivers, or operating system components from a repository without verification that they have been digitally signed using a certificate that is recognized and approved by the organization. Check that yum verifies the signature of packages from a repository prior to install with the following command: # grep gpgcheck /etc/yum.conf gpgcheck=1 If "gpgcheck" is not set to "1", or if options are missing or commented out, ask the System Administrator how the certificates for patches and other operating system components are verified. If there is no process to validate certificates that is approved by the organization, this is a finding.</RawString> </Rule> <Rule id="V-204448" severity="high" conversionstatus="pass" title="SRG-OS-000366-GPOS-00153" dscresource="nxFileLine"> <ContainsLine>localpkg_gpgcheck=1</ContainsLine> <Description><VulnDiscussion>Changes to any software components can have significant effects on the overall security of the operating system. This requirement ensures the software has not been tampered with and that it has been provided by a trusted vendor. Accordingly, patches, service packs, device drivers, or operating system components must be signed with a certificate recognized and approved by the organization. Verifying the authenticity of the software prior to installation validates the integrity of the patch or upgrade received from a vendor. This verifies the software has not been tampered with and that it has been provided by a trusted vendor. Self-signed certificates are disallowed by this requirement. The operating system should not have to verify the software again. This requirement does not mandate DoD certificates for this purpose; however, the certificate used to verify the software must be from an approved CA.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*localpkg_gpgcheck\s*=\s*1</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/yum.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71979</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system prevents the installation of patches, service packs, device drivers, or operating system components of local packages without verification that they have been digitally signed using a certificate that is recognized and approved by the organization. Check that yum verifies the signature of local packages prior to install with the following command: # grep localpkg_gpgcheck /etc/yum.conf localpkg_gpgcheck=1 If "localpkg_gpgcheck" is not set to "1", or if options are missing or commented out, ask the System Administrator how the signatures of local packages and other operating system components are verified. If there is no process to validate the signatures of local packages that is approved by the organization, this is a finding.</RawString> </Rule> <Rule id="V-204449.c" severity="medium" conversionstatus="pass" title="SRG-OS-000114-GPOS-00059" dscresource="nxFileLine"> <ContainsLine>install usb-storage /bin/true</ContainsLine> <Description><VulnDiscussion>USB mass storage permits easy introduction of unknown devices, thereby facilitating malicious activity. Satisfies: SRG-OS-000114-GPOS-00059, SRG-OS-000378-GPOS-00163, SRG-OS-000480-GPOS-00227</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*install\s*usb-storage\s*/bin/true</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/modprobe.d/usb-storage.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71983.c</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system disables the ability to load the USB Storage kernel module. # grep -r usb-storage /etc/modprobe.d/* | grep -i "/bin/true" | grep -v "^#" install usb-storage /bin/true If the command does not return any output, or the line is commented out, and use of USB Storage is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding. Verify the operating system disables the ability to use USB mass storage devices. Check to see if USB mass storage is disabled with the following command: # grep usb-storage /etc/modprobe.d/* | grep -i "blacklist" | grep -v "^#" blacklist usb-storage If the command does not return any output or the output is not "blacklist usb-storage", and use of USB storage devices is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.</RawString> </Rule> <Rule id="V-204449.d" severity="medium" conversionstatus="pass" title="SRG-OS-000114-GPOS-00059" dscresource="nxFileLine"> <ContainsLine>blacklist usb-storage</ContainsLine> <Description><VulnDiscussion>USB mass storage permits easy introduction of unknown devices, thereby facilitating malicious activity. Satisfies: SRG-OS-000114-GPOS-00059, SRG-OS-000378-GPOS-00163, SRG-OS-000480-GPOS-00227</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*blacklist\s*usb-storage</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/modprobe.d/blacklist.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71983.d</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system disables the ability to load the USB Storage kernel module. # grep -r usb-storage /etc/modprobe.d/* | grep -i "/bin/true" | grep -v "^#" install usb-storage /bin/true If the command does not return any output, or the line is commented out, and use of USB Storage is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding. Verify the operating system disables the ability to use USB mass storage devices. Check to see if USB mass storage is disabled with the following command: # grep usb-storage /etc/modprobe.d/* | grep -i "blacklist" | grep -v "^#" blacklist usb-storage If the command does not return any output or the output is not "blacklist usb-storage", and use of USB storage devices is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.</RawString> </Rule> <Rule id="V-204450.b" severity="medium" conversionstatus="pass" title="SRG-OS-000378-GPOS-00163" dscresource="nxFileLine"> <ContainsLine>install dccp /bin/true</ContainsLine> <Description><VulnDiscussion>Disabling DCCP protects the system against exploitation of any flaws in the protocol implementation.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*install\s*dccp\s*/bin/true</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/modprobe.d/dccp.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-77821.b</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system disables the ability to load the DCCP kernel module. # grep -r dccp /etc/modprobe.d/* | grep -i "/bin/true" | grep -v "^#" install dccp /bin/true If the command does not return any output, or the line is commented out, and use of DCCP is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding. Verify the operating system disables the ability to use the DCCP kernel module. Check to see if the DCCP kernel module is disabled with the following command: # grep -i dccp /etc/modprobe.d/* | grep -i "blacklist" | grep -v "^#" blacklist dccp If the command does not return any output or the output is not "blacklist dccp", and use of the dccp kernel module is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.</RawString> </Rule> <Rule id="V-204450.c" severity="medium" conversionstatus="pass" title="SRG-OS-000378-GPOS-00163" dscresource="nxFileLine"> <ContainsLine>blacklist dccp</ContainsLine> <Description><VulnDiscussion>Disabling DCCP protects the system against exploitation of any flaws in the protocol implementation.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*blacklist\s*dccp</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/modprobe.d/blacklist.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-77821.c</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system disables the ability to load the DCCP kernel module. # grep -r dccp /etc/modprobe.d/* | grep -i "/bin/true" | grep -v "^#" install dccp /bin/true If the command does not return any output, or the line is commented out, and use of DCCP is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding. Verify the operating system disables the ability to use the DCCP kernel module. Check to see if the DCCP kernel module is disabled with the following command: # grep -i dccp /etc/modprobe.d/* | grep -i "blacklist" | grep -v "^#" blacklist dccp If the command does not return any output or the output is not "blacklist dccp", and use of the dccp kernel module is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.</RawString> </Rule> <Rule id="V-204452" severity="low" conversionstatus="pass" title="SRG-OS-000437-GPOS-00194" dscresource="nxFileLine"> <ContainsLine>clean_requirements_on_remove=1</ContainsLine> <Description><VulnDiscussion>Previous versions of software components that are not removed from the information system after updates have been installed may be exploited by adversaries. Some information technology products may remove older versions of software automatically from the information system.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*clean_requirements_on_remove\s*=\s*1</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/yum.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71987</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system removes all software components after updated versions have been installed. Check if yum is configured to remove unneeded packages with the following command: # grep -i clean_requirements_on_remove /etc/yum.conf clean_requirements_on_remove=1 If "clean_requirements_on_remove" is not set to "1", "True", or "yes", or is not set in "/etc/yum.conf", this is a finding.</RawString> </Rule> <Rule id="V-204453" severity="medium" conversionstatus="pass" title="SRG-OS-000445-GPOS-00199" dscresource="nxFileLine"> <ContainsLine>SELINUX=enforcing</ContainsLine> <Description><VulnDiscussion>Without verification of the security functions, security functions may not operate correctly and the failure may go unnoticed. Security function is defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data on which the protection is based. Security functionality includes, but is not limited to, establishing system accounts, configuring access authorizations (i.e., permissions, privileges), setting events to be audited, and setting intrusion detection parameters. This requirement applies to operating systems performing security function verification/testing and/or systems and environments that require this functionality.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*SELINUX.*$|^SELINUX\s*=\s*(?!enforcing)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/selinux/config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71989</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Per OPORD 16-0080, the preferred endpoint security tool is Endpoint Security for Linux (ENSL) in conjunction with SELinux. Verify the operating system verifies correct operation of all security functions. Check if "SELinux" is active and in "Enforcing" mode with the following command: # getenforce Enforcing If "SELinux" is not active and not in "Enforcing" mode, this is a finding.</RawString> </Rule> <Rule id="V-204454" severity="medium" conversionstatus="pass" title="SRG-OS-000445-GPOS-00199" dscresource="nxFileLine"> <ContainsLine>SELINUXTYPE=targeted</ContainsLine> <Description><VulnDiscussion>Without verification of the security functions, security functions may not operate correctly and the failure may go unnoticed. Security function is defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data on which the protection is based. Security functionality includes, but is not limited to, establishing system accounts, configuring access authorizations (i.e., permissions, privileges), setting events to be audited, and setting intrusion detection parameters. This requirement applies to operating systems performing security function verification/testing and/or systems and environments that require this functionality.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*SELINUXTYPE.*$|^SELINUXTYPE\s*=\s*(?!targeted\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/selinux/config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71991</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Per OPORD 16-0080, the preferred endpoint security tool is Endpoint Security for Linux (ENSL) in conjunction with SELinux. Verify the operating system verifies correct operation of all security functions. Check if "SELinux" is active and is enforcing the targeted policy with the following command: # sestatus SELinux status: enabled SELinuxfs mount: /selinux SELinux root directory: /etc/selinux Loaded policy name: targeted Current mode: enforcing Mode from config file: enforcing Policy MLS status: enabled Policy deny_unknown status: allowed Max kernel policy version: 28 If the "Loaded policy name" is not set to "targeted", this is a finding. Verify that the /etc/selinux/config file is configured to the "SELINUXTYPE" to "targeted": # grep -i "selinuxtype" /etc/selinux/config | grep -v '^#' SELINUXTYPE = targeted If no results are returned or "SELINUXTYPE" is not set to "targeted", this is a finding.</RawString> </Rule> <Rule id="V-204457" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00228" dscresource="nxFileLine"> <ContainsLine>UMASK 077</ContainsLine> <Description><VulnDiscussion>Setting the most restrictive default permissions ensures that when new accounts are created, they do not have unnecessary access.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^\s*UMASK(?!\s077\b)\s*\d*\s*$|^#\s*UMASK.*</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/login.defs</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71995</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system defines default permissions for all authenticated users in such a way that the user can only read and modify their own files. Check for the value of the "UMASK" parameter in "/etc/login.defs" file with the following command: Note: If the value of the "UMASK" parameter is set to "000" in "/etc/login.defs" file, the Severity is raised to a CAT I. # grep -i umask /etc/login.defs UMASK 077 If the value for the "UMASK" parameter is not "077", or the "UMASK" parameter is missing or is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204466" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFileLine"> <ContainsLine>CREATE_HOME yes</ContainsLine> <Description><VulnDiscussion>If local interactive users are not assigned a valid home directory, there is no place for the storage and control of files they should own.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*CREATE_HOME.*$|^CREATE_HOME\s*(?!yes\b)\w*$|^CREATE_HOME\t.*</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/login.defs</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72013</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify all local interactive users on the system are assigned a home directory upon creation. Check to see if the system is configured to create home directories for local interactive users with the following command: # grep -i create_home /etc/login.defs CREATE_HOME yes If the value for "CREATE_HOME" parameter is not set to "yes", the line is missing, or the line is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204504" severity="medium" conversionstatus="pass" title="SRG-OS-000046-GPOS-00022" dscresource="nxFileLine"> <ContainsLine>-f 2</ContainsLine> <Description><VulnDiscussion>It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Without this notification, the security personnel may be unaware of an impending failure of the audit capability, and system operation may be adversely affected. Audit processing failures include software/hardware errors, failures in the audit capturing mechanisms, and audit storage capacity being reached or exceeded. This requirement applies to each audit data storage repository (i.e., distinct information system component where audit records are stored), the centralized audit storage capacity of organizations (i.e., all audit data storage repositories combined), or both. Satisfies: SRG-OS-000046-GPOS-00022, SRG-OS-000047-GPOS-00023</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*-f\s+2|^\s*-f\s*1</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72081</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Confirm the audit configuration regarding how auditing processing failures are handled. Check to see what level "auditctl" is set to with following command: # auditctl -s | grep -i "fail" failure 2 Note: If the value of "failure" is set to "2", the system is configured to panic (shut down) in the event of an auditing failure. If the value of "failure" is set to "1", the system will not shut down and instead will record the audit failure in the kernel log. If the system is configured as per requirement RHEL-07-031000, the kernel log will be sent to a log aggregation server and generate an alert. If the "failure" setting is set to any value other than "1" or "2", this is a finding. If the "failure" setting is not set, this should be upgraded to a CAT I finding. If the "failure" setting is set to "1" but the availability concern is not documented or there is no monitoring of the kernel log, this should be downgraded to a CAT III finding.</RawString> </Rule> <Rule id="V-204506.a" severity="medium" conversionstatus="pass" title="SRG-OS-000342-GPOS-00133" dscresource="nxFileLine"> <ContainsLine>active = yes</ContainsLine> <Description><VulnDiscussion>Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity. One method of off-loading audit logs in Red Hat Enterprise Linux is with the use of the audisp-remote dameon. Without the configuration of the "au-remote" plugin, the audisp-remote daemon will not off load the logs from the system being audited. Satisfies: SRG-OS-000342-GPOS-00133, SRG-OS-000479-GPOS-00224</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>\s*active\s*=\s*no|active=yes|#\s*active\s*=.*</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audisp/plugins.d/au-remote.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-81017.a</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the "au-remote" plugin is configured to always off-load audit logs using the audisp-remote daemon: # cat /etc/audisp/plugins.d/au-remote.conf | grep -v "^#" active = yes direction = out path = /sbin/audisp-remote type = always format = string If "active" is not set to "yes", "direction" is not set to "out", "path" is not set to "/sbin/audisp-remote", "type" is not set to "always", or any of the lines are commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or storage media. If there is no evidence that the system is configured to off-load audit logs to a different system or storage media, this is a finding.</RawString> </Rule> <Rule id="V-204506.b" severity="medium" conversionstatus="pass" title="SRG-OS-000342-GPOS-00133" dscresource="nxFileLine"> <ContainsLine>direction = out</ContainsLine> <Description><VulnDiscussion>Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity. One method of off-loading audit logs in Red Hat Enterprise Linux is with the use of the audisp-remote dameon. Without the configuration of the "au-remote" plugin, the audisp-remote daemon will not off load the logs from the system being audited. Satisfies: SRG-OS-000342-GPOS-00133, SRG-OS-000479-GPOS-00224</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*direction\s*=\s*out</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audisp/plugins.d/au-remote.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-81017.b</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the "au-remote" plugin is configured to always off-load audit logs using the audisp-remote daemon: # cat /etc/audisp/plugins.d/au-remote.conf | grep -v "^#" active = yes direction = out path = /sbin/audisp-remote type = always format = string If "active" is not set to "yes", "direction" is not set to "out", "path" is not set to "/sbin/audisp-remote", "type" is not set to "always", or any of the lines are commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or storage media. If there is no evidence that the system is configured to off-load audit logs to a different system or storage media, this is a finding.</RawString> </Rule> <Rule id="V-204506.c" severity="medium" conversionstatus="pass" title="SRG-OS-000342-GPOS-00133" dscresource="nxFileLine"> <ContainsLine>path = /sbin/audisp-remote</ContainsLine> <Description><VulnDiscussion>Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity. One method of off-loading audit logs in Red Hat Enterprise Linux is with the use of the audisp-remote dameon. Without the configuration of the "au-remote" plugin, the audisp-remote daemon will not off load the logs from the system being audited. Satisfies: SRG-OS-000342-GPOS-00133, SRG-OS-000479-GPOS-00224</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*path\s*=\s*/sbin/audisp-remote</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audisp/plugins.d/au-remote.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-81017.c</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the "au-remote" plugin is configured to always off-load audit logs using the audisp-remote daemon: # cat /etc/audisp/plugins.d/au-remote.conf | grep -v "^#" active = yes direction = out path = /sbin/audisp-remote type = always format = string If "active" is not set to "yes", "direction" is not set to "out", "path" is not set to "/sbin/audisp-remote", "type" is not set to "always", or any of the lines are commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or storage media. If there is no evidence that the system is configured to off-load audit logs to a different system or storage media, this is a finding.</RawString> </Rule> <Rule id="V-204506.d" severity="medium" conversionstatus="pass" title="SRG-OS-000342-GPOS-00133" dscresource="nxFileLine"> <ContainsLine>type = always</ContainsLine> <Description><VulnDiscussion>Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity. One method of off-loading audit logs in Red Hat Enterprise Linux is with the use of the audisp-remote dameon. Without the configuration of the "au-remote" plugin, the audisp-remote daemon will not off load the logs from the system being audited. Satisfies: SRG-OS-000342-GPOS-00133, SRG-OS-000479-GPOS-00224</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*type\s*=\s*always</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audisp/plugins.d/au-remote.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-81017.d</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the "au-remote" plugin is configured to always off-load audit logs using the audisp-remote daemon: # cat /etc/audisp/plugins.d/au-remote.conf | grep -v "^#" active = yes direction = out path = /sbin/audisp-remote type = always format = string If "active" is not set to "yes", "direction" is not set to "out", "path" is not set to "/sbin/audisp-remote", "type" is not set to "always", or any of the lines are commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or storage media. If there is no evidence that the system is configured to off-load audit logs to a different system or storage media, this is a finding.</RawString> </Rule> <Rule id="V-204507" severity="medium" conversionstatus="pass" title="SRG-OS-000342-GPOS-00133" dscresource="nxFileLine"> <ContainsLine>overflow_action = syslog</ContainsLine> <Description><VulnDiscussion>Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity. One method of off-loading audit logs in Red Hat Enterprise Linux is with the use of the audisp-remote dameon. When the remote buffer is full, audit logs will not be collected and sent to the central log server. Satisfies: SRG-OS-000342-GPOS-00133, SRG-OS-000479-GPOS-00224</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*overflow_action.*$|^overflow_action\s*=\s*(?!syslog$)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audisp/audispd.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-81019</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the audisp daemon is configured to take an appropriate action when the internal queue is full: # grep "overflow_action" /etc/audisp/audispd.conf overflow_action = syslog If the "overflow_action" option is not "syslog", "single", or "halt", or the line is commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or storage media, and to indicate what action that system takes when the internal queue is full. If there is no evidence the system is configured to off-load audit logs to a different system or storage media or, if the configuration does not take appropriate action when the internal queue is full, this is a finding.</RawString> </Rule> <Rule id="V-204508" severity="medium" conversionstatus="pass" title="SRG-OS-000342-GPOS-00133" dscresource="nxFileLine"> <ContainsLine>name_format = hostname</ContainsLine> <Description><VulnDiscussion>Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity. One method of off-loading audit logs in Red Hat Enterprise Linux is with the use of the audisp-remote dameon. When audit logs are not labeled before they are sent to a central log server, the audit data will not be able to be analyzed and tied back to the correct system. Satisfies: SRG-OS-000342-GPOS-00133, SRG-OS-000479-GPOS-00224</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*name_format.*$|^name_format\s*=\s*(?!hostname$)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audisp/audispd.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-81021</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the audisp daemon is configured to label all off-loaded audit logs: # grep "name_format" /etc/audisp/audispd.conf name_format = hostname If the "name_format" option is not "hostname", "fqd", or "numeric", or the line is commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or storage media, and to indicate if the logs are labeled appropriately. If there is no evidence that the system is configured to off-load audit logs to a different system or storage media, or if the configuration does not appropriately label logs before they are off-loaded, this is a finding.</RawString> </Rule> <Rule id="V-204509" severity="medium" conversionstatus="pass" title="SRG-OS-000342-GPOS-00133" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity. Satisfies: SRG-OS-000342-GPOS-00133, SRG-OS-000479-GPOS-00224</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audisp/audisp-remote.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72083</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the IP address of the log aggregation server is defined; i.e.: remote_server = <IPAddress> </OrganizationValueTestString> <RawString>Verify the operating system off-loads audit records onto a different system or media from the system being audited. To determine the remote server that the records are being sent to, use the following command: # grep -i remote_server /etc/audisp/audisp-remote.conf remote_server = 10.0.21.1 If a remote server is not configured, or the line is commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or media. If there is no evidence that the audit logs are being off-loaded to another system or media, this is a finding.</RawString> </Rule> <Rule id="V-204510" severity="medium" conversionstatus="pass" title="SRG-OS-000342-GPOS-00133" dscresource="nxFileLine"> <ContainsLine>enable_krb5 = yes</ContainsLine> <Description><VulnDiscussion>Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity. Satisfies: SRG-OS-000342-GPOS-00133, SRG-OS-000479-GPOS-00224</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*enable_krb5\s*=\s*yes</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audisp/audisp-remote.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72085</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system encrypts audit records off-loaded onto a different system or media from the system being audited. To determine if the transfer is encrypted, use the following command: # grep -i enable_krb5 /etc/audisp/audisp-remote.conf enable_krb5 = yes If the value of the "enable_krb5" option is not set to "yes" or the line is commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or media. If there is no evidence that the transfer of the audit logs being off-loaded to another system or media is encrypted, this is a finding.</RawString> </Rule> <Rule id="V-204511" severity="medium" conversionstatus="pass" title="SRG-OS-000342-GPOS-00133" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>Taking appropriate action in case of a filled audit storage volume will minimize the possibility of losing audit records. One method of off-loading audit logs in Red Hat Enterprise Linux is with the use of the audisp-remote dameon.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audisp/audisp-remote.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72087</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the value of the "disk_full_action" option is set to "SYSLOG", "SINGLE", or "HALT"; i.e.: "disk_full_action = single" </OrganizationValueTestString> <RawString>Verify the action the operating system takes if the disk the audit records are written to becomes full. To determine the action that takes place if the disk is full on the remote server, use the following command: # grep -i disk_full_action /etc/audisp/audisp-remote.conf disk_full_action = single If the value of the "disk_full_action" option is not "syslog", "single", or "halt", or the line is commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or storage media, and to indicate the action taken when the disk is full on the remote server. If there is no evidence that the system is configured to off-load audit logs to a different system or storage media, or if the configuration does not take appropriate action when the disk is full on the remote server, this is a finding.</RawString> </Rule> <Rule id="V-204512" severity="medium" conversionstatus="pass" title="SRG-OS-000342-GPOS-00133" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>Taking appropriate action when there is an error sending audit records to a remote system will minimize the possibility of losing audit records. One method of off-loading audit logs in Red Hat Enterprise Linux is with the use of the audisp-remote dameon.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audisp/audisp-remote.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-73163</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the "network_failure_action" option is set to "SYSLOG", "SINGLE", or "HALT"; i.e.: "network_failure_action = syslog" </OrganizationValueTestString> <RawString>Verify the action the operating system takes if there is an error sending audit records to a remote system. Check the action that takes place if there is an error sending audit records to a remote system with the following command: # grep -i network_failure_action /etc/audisp/audisp-remote.conf network_failure_action = syslog If the value of the "network_failure_action" option is not "syslog", "single", or "halt", or the line is commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or storage media, and to indicate the action taken if there is an error sending audit records to the remote system. If there is no evidence that the system is configured to off-load audit logs to a different system or storage media, or if the configuration does not take appropriate action if there is an error sending audit records to the remote system, this is a finding.</RawString> </Rule> <Rule id="V-204513" severity="medium" conversionstatus="pass" title="SRG-OS-000343-GPOS-00134" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>If security personnel are not notified immediately when storage volume reaches 75 percent utilization, they are unable to plan for audit record storage capacity expansion.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/auditd.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72089</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the value of the "space_left" keyword is not set to 25 percent of the total partition size</OrganizationValueTestString> <RawString>Verify the operating system initiates an action to notify the SA and ISSO (at a minimum) when allocated audit record storage volume reaches 75 percent of the repository maximum audit record storage capacity. Check the system configuration to determine the partition the audit records are being written to with the following command: $ sudo grep -iw log_file /etc/audit/auditd.conf log_file = /var/log/audit/audit.log Determine what the threshold is for the system to take action when 75 percent of the repository maximum audit record storage capacity is reached: $ sudo grep -iw space_left /etc/audit/auditd.conf space_left = 25% If the value of the "space_left" keyword is not set to 25 percent of the total partition size, this is a finding.</RawString> </Rule> <Rule id="V-204514" severity="medium" conversionstatus="pass" title="SRG-OS-000343-GPOS-00134" dscresource="nxFileLine"> <ContainsLine>space_left_action = email</ContainsLine> <Description><VulnDiscussion>If security personnel are not notified immediately when the threshold for the repository maximum audit record storage capacity is reached, they are unable to expand the audit record storage capacity before records are lost.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*space_left_action.*$|^space_left_action\s*=\s*(?!email$)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/auditd.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72091</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system immediately notifies the SA and ISSO (at a minimum) via email when the allocated audit record storage volume reaches 75 percent of the repository maximum audit record storage capacity. Check what action the operating system takes when the threshold for the repository maximum audit record storage capacity is reached with the following command: # grep -i space_left_action /etc/audit/auditd.conf space_left_action = email If the value of the "space_left_action" keyword is not set to "email", this is a finding.</RawString> </Rule> <Rule id="V-204515" severity="medium" conversionstatus="pass" title="SRG-OS-000343-GPOS-00134" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>If security personnel are not notified immediately when the threshold for the repository maximum audit record storage capacity is reached, they are unable to expand the audit record storage capacity before records are lost.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/auditd.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72093</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the value of the "action_mail_acct" keyword is set to "root" and/or other accounts for security personnel; i.e.: "action_mail_acct = root" </OrganizationValueTestString> <RawString>Verify the operating system immediately notifies the SA and ISSO (at a minimum) via email when the threshold for the repository maximum audit record storage capacity is reached. Check what account the operating system emails when the threshold for the repository maximum audit record storage capacity is reached with the following command: # grep -i action_mail_acct /etc/audit/auditd.conf action_mail_acct = root If the value of the "action_mail_acct" keyword is not set to "root" and other accounts for security personnel, this is a finding.</RawString> </Rule> <Rule id="V-204516.a" severity="medium" conversionstatus="pass" title="SRG-OS-000327-GPOS-00127" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b32 -S execve -C uid!=euid -F euid=0 -k setuid</ContainsLine> <Description><VulnDiscussion>Misuse of privileged functions, either intentionally or unintentionally by authorized users, or by unauthorized external entities that have compromised information system accounts, is a serious and ongoing concern and can have significant adverse impacts on organizations. Auditing the use of privileged functions is one way to detect such misuse and identify the risk from insider threats and the advanced persistent threat.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b32\s*-S\s*execve\s*-C\s*uid!\s*=\s*euid\s*-F\s*euid\s*=\s*0\s*-k\s*setuid</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72095.a</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system audits the execution of privileged functions using the following command: # grep -iw execve /etc/audit/audit.rules -a always,exit -F arch=b32 -S execve -C uid!=euid -F euid=0 -k setuid If both the "b32" and "b64" audit rules for "SUID" files are not defined, this is a finding. If both the "b32" and "b64" audit rules for "SGID" files are not defined, this is a finding. </RawString> </Rule> <Rule id="V-204516.b" severity="medium" conversionstatus="pass" title="SRG-OS-000327-GPOS-00127" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b64 -S execve -C uid!=euid -F euid=0 -k setuid</ContainsLine> <Description><VulnDiscussion>Misuse of privileged functions, either intentionally or unintentionally by authorized users, or by unauthorized external entities that have compromised information system accounts, is a serious and ongoing concern and can have significant adverse impacts on organizations. Auditing the use of privileged functions is one way to detect such misuse and identify the risk from insider threats and the advanced persistent threat.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b64\s*-S\s*execve\s*-C\s*uid!\s*=\s*euid\s*-F\s*euid\s*=\s*0\s*-k\s*setuid</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72095.b</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system audits the execution of privileged functions using the following command: # grep -iw execve /etc/audit/audit.rules -a always,exit -F arch=b64 -S execve -C uid!=euid -F euid=0 -k setuid If both the "b32" and "b64" audit rules for "SUID" files are not defined, this is a finding. If both the "b32" and "b64" audit rules for "SGID" files are not defined, this is a finding. </RawString> </Rule> <Rule id="V-204516.c" severity="medium" conversionstatus="pass" title="SRG-OS-000327-GPOS-00127" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b32 -S execve -C gid!=egid -F egid=0 -k setgid</ContainsLine> <Description><VulnDiscussion>Misuse of privileged functions, either intentionally or unintentionally by authorized users, or by unauthorized external entities that have compromised information system accounts, is a serious and ongoing concern and can have significant adverse impacts on organizations. Auditing the use of privileged functions is one way to detect such misuse and identify the risk from insider threats and the advanced persistent threat.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b32\s*-S\s*execve\s*-C\s*gid!\s*=\s*egid\s*-F\s*egid\s*=\s*0\s*-k\s*setgid</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72095.c</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system audits the execution of privileged functions using the following command: # grep -iw execve /etc/audit/audit.rules -a always,exit -F arch=b32 -S execve -C gid!=egid -F egid=0 -k setgid If both the "b32" and "b64" audit rules for "SUID" files are not defined, this is a finding. If both the "b32" and "b64" audit rules for "SGID" files are not defined, this is a finding. </RawString> </Rule> <Rule id="V-204516.d" severity="medium" conversionstatus="pass" title="SRG-OS-000327-GPOS-00127" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b64 -S execve -C gid!=egid -F egid=0 -k setgid</ContainsLine> <Description><VulnDiscussion>Misuse of privileged functions, either intentionally or unintentionally by authorized users, or by unauthorized external entities that have compromised information system accounts, is a serious and ongoing concern and can have significant adverse impacts on organizations. Auditing the use of privileged functions is one way to detect such misuse and identify the risk from insider threats and the advanced persistent threat.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b64\s*-S\s*execve\s*-C\s*gid!\s*=\s*egid\s*-F\s*egid\s*=\s*0\s*-k\s*setgid</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72095.d</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system audits the execution of privileged functions using the following command: # grep -iw execve /etc/audit/audit.rules -a always,exit -F arch=b64 -S execve -C gid!=egid -F egid=0 -k setgid If both the "b32" and "b64" audit rules for "SUID" files are not defined, this is a finding. If both the "b32" and "b64" audit rules for "SGID" files are not defined, this is a finding. </RawString> </Rule> <Rule id="V-204517.a" severity="medium" conversionstatus="pass" title="SRG-OS-000064-GPOS-00033" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b32 -S chown,fchown,fchownat,lchown -F auid>=1000 -F auid!=unset -k perm_mod</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance can be helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000392-GPOS-00172, SRG-OS-000458-GPOS-00203, SRG-OS-000474-GPOS-00219</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b32\s*-S\s*chown,fchown,fchownat,lchown\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*perm_mod</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72097.a</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "chown", "fchown", "fchownat", and "lchown" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep chown /etc/audit/audit.rules -a always,exit -F arch=b32 -S chown,fchown,fchownat,lchown -F auid>=1000 -F auid!=unset -k perm_mod If both the "b32" and "b64" audit rules are not defined for the "chown", "fchown", "fchownat", and "lchown" syscalls, this is a finding. </RawString> </Rule> <Rule id="V-204517.b" severity="medium" conversionstatus="pass" title="SRG-OS-000064-GPOS-00033" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b64 -S chown,fchown,fchownat,lchown -F auid>=1000 -F auid!=unset -k perm_mod</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance can be helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000392-GPOS-00172, SRG-OS-000458-GPOS-00203, SRG-OS-000474-GPOS-00219</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b64\s*-S\s*chown,fchown,fchownat,lchown\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*perm_mod</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72097.b</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "chown", "fchown", "fchownat", and "lchown" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep chown /etc/audit/audit.rules -a always,exit -F arch=b64 -S chown,fchown,fchownat,lchown -F auid>=1000 -F auid!=unset -k perm_mod If both the "b32" and "b64" audit rules are not defined for the "chown", "fchown", "fchownat", and "lchown" syscalls, this is a finding. </RawString> </Rule> <Rule id="V-204521.a" severity="medium" conversionstatus="pass" title="SRG-OS-000458-GPOS-00203" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b32 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=unset -k perm_mod</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance can be helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000458-GPOS-00203, SRG-OS-000392-GPOS-00172, SRG-OS-000064-GPOS-00033</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b32\s*-S\s*chmod,fchmod,fchmodat\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*perm_mod</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72105.a</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "chmod", "fchmod", and "fchmodat" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following command: # grep chmod /etc/audit/audit.rules -a always,exit -F arch=b32 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=unset -k perm_mod If both the "b32" and "b64" audit rules are not defined for the "chmod", "fchmod", and "fchmodat" syscalls, this is a finding. </RawString> </Rule> <Rule id="V-204521.b" severity="medium" conversionstatus="pass" title="SRG-OS-000458-GPOS-00203" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b64 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=unset -k perm_mod</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance can be helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000458-GPOS-00203, SRG-OS-000392-GPOS-00172, SRG-OS-000064-GPOS-00033</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b64\s*-S\s*chmod,fchmod,fchmodat\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*perm_mod</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72105.b</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "chmod", "fchmod", and "fchmodat" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following command: # grep chmod /etc/audit/audit.rules -a always,exit -F arch=b64 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=unset -k perm_mod If both the "b32" and "b64" audit rules are not defined for the "chmod", "fchmod", and "fchmodat" syscalls, this is a finding. </RawString> </Rule> <Rule id="V-204524.a" severity="medium" conversionstatus="pass" title="SRG-OS-000458-GPOS-00203" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b32 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid>=1000 -F auid!=unset -k perm_mod</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance can be helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000458-GPOS-00203, SRG-OS-000392-GPOS-00172, SRG-OS-000064-GPOS-00033</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b32\s*-S\s*setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*perm_mod</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72111.a</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "setxattr", "fsetxattr", "lsetxattr", "removexattr", "fremovexattr", and "lremovexattr" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep xattr /etc/audit/audit.rules -a always,exit -F arch=b32 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid>=1000 -F auid!=unset -k perm_mod If both the "b32" and "b64" audit rules are not defined for the "setxattr", "fsetxattr", "lsetxattr", "removexattr", "fremovexattr", and "lremovexattr" syscalls, this is a finding. </RawString> </Rule> <Rule id="V-204524.b" severity="medium" conversionstatus="pass" title="SRG-OS-000458-GPOS-00203" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b64 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid>=1000 -F auid!=unset -k perm_mod</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance can be helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000458-GPOS-00203, SRG-OS-000392-GPOS-00172, SRG-OS-000064-GPOS-00033</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b64\s*-S\s*setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*perm_mod</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72111.b</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "setxattr", "fsetxattr", "lsetxattr", "removexattr", "fremovexattr", and "lremovexattr" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep xattr /etc/audit/audit.rules -a always,exit -F arch=b64 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid>=1000 -F auid!=unset -k perm_mod If both the "b32" and "b64" audit rules are not defined for the "setxattr", "fsetxattr", "lsetxattr", "removexattr", "fremovexattr", and "lremovexattr" syscalls, this is a finding. </RawString> </Rule> <Rule id="V-204531.a" severity="medium" conversionstatus="pass" title="SRG-OS-000064-GPOS-00033" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b32 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance can be helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000458-GPOS-00203, SRG-OS-000461-GPOS-00205, SRG-OS-000392-GPOS-00172</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b32\s*-S\s*creat,open,openat,open_by_handle_at,truncate,ftruncate\s*-F\s*exit\s*=\s*-EPERM\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*access</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72125.a</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "creat", "open", "openat", "open_by_handle_at", "truncate", and "ftruncate" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep 'open\|truncate\|creat' /etc/audit/audit.rules -a always,exit -F arch=b32 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access If both the "b32" and "b64" audit rules are not defined for the "creat", "open", "openat", "open_by_handle_at", "truncate", and "ftruncate" syscalls, this is a finding. If the output does not produce rules containing "-F exit=-EPERM", this is a finding. If the output does not produce rules containing "-F exit=-EACCES", this is a finding. </RawString> </Rule> <Rule id="V-204531.b" severity="medium" conversionstatus="pass" title="SRG-OS-000064-GPOS-00033" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b32 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance can be helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000458-GPOS-00203, SRG-OS-000461-GPOS-00205, SRG-OS-000392-GPOS-00172</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b32\s*-S\s*creat,open,openat,open_by_handle_at,truncate,ftruncate\s*-F\s*exit\s*=\s*-EACCES\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*access</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72125.b</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "creat", "open", "openat", "open_by_handle_at", "truncate", and "ftruncate" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep 'open\|truncate\|creat' /etc/audit/audit.rules -a always,exit -F arch=b32 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access If both the "b32" and "b64" audit rules are not defined for the "creat", "open", "openat", "open_by_handle_at", "truncate", and "ftruncate" syscalls, this is a finding. If the output does not produce rules containing "-F exit=-EPERM", this is a finding. If the output does not produce rules containing "-F exit=-EACCES", this is a finding. </RawString> </Rule> <Rule id="V-204531.c" severity="medium" conversionstatus="pass" title="SRG-OS-000064-GPOS-00033" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b64 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance can be helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000458-GPOS-00203, SRG-OS-000461-GPOS-00205, SRG-OS-000392-GPOS-00172</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b64\s*-S\s*creat,open,openat,open_by_handle_at,truncate,ftruncate\s*-F\s*exit\s*=\s*-EPERM\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*access</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72125.c</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "creat", "open", "openat", "open_by_handle_at", "truncate", and "ftruncate" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep 'open\|truncate\|creat' /etc/audit/audit.rules -a always,exit -F arch=b64 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access If both the "b32" and "b64" audit rules are not defined for the "creat", "open", "openat", "open_by_handle_at", "truncate", and "ftruncate" syscalls, this is a finding. If the output does not produce rules containing "-F exit=-EPERM", this is a finding. If the output does not produce rules containing "-F exit=-EACCES", this is a finding. </RawString> </Rule> <Rule id="V-204531.d" severity="medium" conversionstatus="pass" title="SRG-OS-000064-GPOS-00033" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b64 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance can be helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000458-GPOS-00203, SRG-OS-000461-GPOS-00205, SRG-OS-000392-GPOS-00172</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b64\s*-S\s*creat,open,openat,open_by_handle_at,truncate,ftruncate\s*-F\s*exit\s*=\s*-EACCES\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*access</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72125.d</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "creat", "open", "openat", "open_by_handle_at", "truncate", and "ftruncate" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep 'open\|truncate\|creat' /etc/audit/audit.rules -a always,exit -F arch=b64 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access If both the "b32" and "b64" audit rules are not defined for the "creat", "open", "openat", "open_by_handle_at", "truncate", and "ftruncate" syscalls, this is a finding. If the output does not produce rules containing "-F exit=-EPERM", this is a finding. If the output does not produce rules containing "-F exit=-EACCES", this is a finding. </RawString> </Rule> <Rule id="V-204536" severity="medium" conversionstatus="pass" title="SRG-OS-000392-GPOS-00172" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/sbin/semanage -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000392-GPOS-00172, SRG-OS-000463-GPOS-00207, SRG-OS-000465-GPOS-00209</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/sbin/semanage\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-priv_change</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72135</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "semanage" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/sbin/semanage" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/semanage -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204537" severity="medium" conversionstatus="pass" title="SRG-OS-000392-GPOS-00172" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/sbin/setsebool -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000392-GPOS-00172, SRG-OS-000463-GPOS-00207, SRG-OS-000465-GPOS-00209</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/sbin/setsebool\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-priv_change</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72137</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "setsebool" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/sbin/setsebool" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/setsebool -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204538" severity="medium" conversionstatus="pass" title="SRG-OS-000392-GPOS-00172" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/bin/chcon -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000392-GPOS-00172, SRG-OS-000463-GPOS-00207, SRG-OS-000465-GPOS-00209</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/bin/chcon\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-priv_change</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72139</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "chcon" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/bin/chcon" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/chcon -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204539" severity="medium" conversionstatus="pass" title="SRG-OS-000392-GPOS-00172" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/sbin/setfiles -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000392-GPOS-00172, SRG-OS-000463-GPOS-00207, SRG-OS-000465-GPOS-00209</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/sbin/setfiles\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-priv_change</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72141</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "setfiles" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/sbin/setfiles" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/setfiles -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204540" severity="medium" conversionstatus="pass" title="SRG-OS-000392-GPOS-00172" dscresource="nxFileLine"> <ContainsLine>-w /var/run/faillock -p wa -k logins</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000392-GPOS-00172, SRG-OS-000470-GPOS-00214, SRG-OS-000473-GPOS-00218</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-w\s*/var/run/faillock\s*-p\s*wa\s*-k\s*logins</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72145</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when unsuccessful account access events occur. Check the file system rule in "/etc/audit/audit.rules" with the following commands: # grep -i /var/run/faillock /etc/audit/audit.rules -w /var/run/faillock -p wa -k logins If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204541" severity="medium" conversionstatus="pass" title="SRG-OS-000392-GPOS-00172" dscresource="nxFileLine"> <ContainsLine>-w /var/log/lastlog -p wa -k logins</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000392-GPOS-00172, SRG-OS-000470-GPOS-00214, SRG-OS-000473-GPOS-00218</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-w\s*/var/log/lastlog\s*-p\s*wa\s*-k\s*logins</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72147</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful account access events occur. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep -i /var/log/lastlog /etc/audit/audit.rules -w /var/log/lastlog -p wa -k logins If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204542" severity="medium" conversionstatus="pass" title="SRG-OS-000042-GPOS-00020" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/bin/passwd -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged password commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/bin/passwd\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-passwd</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72149</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "passwd" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/bin/passwd" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/passwd -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204543" severity="medium" conversionstatus="pass" title="SRG-OS-000042-GPOS-00020" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/sbin/unix_chkpwd -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged password commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/sbin/unix_chkpwd\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-passwd</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72151</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "unix_chkpwd" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/sbin/unix_chkpwd" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/unix_chkpwd -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204544" severity="medium" conversionstatus="pass" title="SRG-OS-000042-GPOS-00020" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/bin/gpasswd -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged password commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/bin/gpasswd\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-passwd</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72153</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "gpasswd" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/bin/gpasswd" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/gpasswd -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204545" severity="medium" conversionstatus="pass" title="SRG-OS-000042-GPOS-00020" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/bin/chage -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged password commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/bin/chage\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-passwd</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72155</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "chage" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/bin/chage" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/chage -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204546" severity="medium" conversionstatus="pass" title="SRG-OS-000042-GPOS-00020" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/sbin/userhelper -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged password commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/sbin/userhelper\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-passwd</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72157</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "userhelper" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/sbin/userhelper" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/userhelper -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204547" severity="medium" conversionstatus="pass" title="SRG-OS-000037-GPOS-00015" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/bin/su -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/bin/su\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-priv_change</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72159</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "su" command occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/bin/su" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/su -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204548" severity="medium" conversionstatus="pass" title="SRG-OS-000037-GPOS-00015" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/bin/sudo -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/bin/sudo\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-priv_change</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72161</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "sudo" command occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/bin/sudo" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/sudo -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204549.a" severity="medium" conversionstatus="pass" title="SRG-OS-000037-GPOS-00015" dscresource="nxFileLine"> <ContainsLine>-w /etc/sudoers -p wa -k privileged-actions</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-w /etc/sudoers -p wa -k privileged-actions</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72163.a</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to access the "/etc/sudoers" file and files in the "/etc/sudoers.d/" directory. Check for modification of the following files being audited by performing the following commands to check the file system rules in "/etc/audit/audit.rules": # grep -i "/etc/sudoers" /etc/audit/audit.rules -w /etc/sudoers -p wa -k privileged-actions # grep -i "/etc/sudoers.d/" /etc/audit/audit.rules -w /etc/sudoers.d/ -p wa -k privileged-actions If the commands do not return output that match the examples, this is a finding.</RawString> </Rule> <Rule id="V-204549.b" severity="medium" conversionstatus="pass" title="SRG-OS-000037-GPOS-00015" dscresource="nxFileLine"> <ContainsLine>-w /etc/sudoers.d/ -p wa -k privileged-actions</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-w /etc/sudoers.d/ -p wa -k privileged-actions</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72163.b</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to access the "/etc/sudoers" file and files in the "/etc/sudoers.d/" directory. Check for modification of the following files being audited by performing the following commands to check the file system rules in "/etc/audit/audit.rules": # grep -i "/etc/sudoers" /etc/audit/audit.rules -w /etc/sudoers -p wa -k privileged-actions # grep -i "/etc/sudoers.d/" /etc/audit/audit.rules -w /etc/sudoers.d/ -p wa -k privileged-actions If the commands do not return output that match the examples, this is a finding.</RawString> </Rule> <Rule id="V-204550" severity="medium" conversionstatus="pass" title="SRG-OS-000037-GPOS-00015" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/bin/newgrp -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/bin/newgrp\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-priv_change</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72165</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "newgrp" command occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/bin/newgrp" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/newgrp -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204551" severity="medium" conversionstatus="pass" title="SRG-OS-000037-GPOS-00015" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/bin/chsh -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/bin/chsh\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-priv_change</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72167</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "chsh" command occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/bin/chsh" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/chsh -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204552.a" severity="medium" conversionstatus="pass" title="SRG-OS-000042-GPOS-00020" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b32 -S mount -F auid>=1000 -F auid!=unset -k privileged-mount</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged mount commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b32\s*-S\s*mount\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-mount</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72171.a</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "mount" command and syscall occur. Check that the following system call is being audited by performing the following series of commands to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "mount" /etc/audit/audit.rules -a always,exit -F arch=b32 -S mount -F auid>=1000 -F auid!=unset -k privileged-mount If both the "b32" and "b64" audit rules are not defined for the "mount" syscall, this is a finding. If all uses of the "mount" command are not being audited, this is a finding. </RawString> </Rule> <Rule id="V-204552.b" severity="medium" conversionstatus="pass" title="SRG-OS-000042-GPOS-00020" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b64 -S mount -F auid>=1000 -F auid!=unset -k privileged-mount</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged mount commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b64\s*-S\s*mount\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-mount</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72171.b</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "mount" command and syscall occur. Check that the following system call is being audited by performing the following series of commands to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "mount" /etc/audit/audit.rules -a always,exit -F arch=b64 -S mount -F auid>=1000 -F auid!=unset -k privileged-mount If both the "b32" and "b64" audit rules are not defined for the "mount" syscall, this is a finding. If all uses of the "mount" command are not being audited, this is a finding. </RawString> </Rule> <Rule id="V-204552.c" severity="medium" conversionstatus="pass" title="SRG-OS-000042-GPOS-00020" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/bin/mount -F perm=x -F auid>=1000 -F auid!=unset -k privileged-mount</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged mount commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/bin/mount\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-mount</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72171.c</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "mount" command and syscall occur. Check that the following system call is being audited by performing the following series of commands to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "mount" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/mount -F perm=x -F auid>=1000 -F auid!=unset -k privileged-mount If both the "b32" and "b64" audit rules are not defined for the "mount" syscall, this is a finding. If all uses of the "mount" command are not being audited, this is a finding. </RawString> </Rule> <Rule id="V-204553" severity="medium" conversionstatus="pass" title="SRG-OS-000042-GPOS-00020" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/bin/umount -F perm=x -F auid>=1000 -F auid!=unset -k privileged-mount</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged mount commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/bin/umount\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-mount</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72173</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "umount" command occur. Check that the following system call is being audited by performing the following series of commands to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/bin/umount" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/umount -F perm=x -F auid>=1000 -F auid!=unset -k privileged-mount If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204554" severity="medium" conversionstatus="pass" title="SRG-OS-000042-GPOS-00020" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/sbin/postdrop -F perm=x -F auid>=1000 -F auid!=unset -k privileged-postfix</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged postfix commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/sbin/postdrop\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-postfix</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72175</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "postdrop" command occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/sbin/postdrop" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/postdrop -F perm=x -F auid>=1000 -F auid!=unset -k privileged-postfix If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204555" severity="medium" conversionstatus="pass" title="SRG-OS-000042-GPOS-00020" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/sbin/postqueue -F perm=x -F auid>=1000 -F auid!=unset -k privileged-postfix</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged postfix commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/sbin/postqueue\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-postfix</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72177</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "postqueue" command occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/sbin/postqueue" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/postqueue -F perm=x -F auid>=1000 -F auid!=unset -k privileged-postfix If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204556" severity="medium" conversionstatus="pass" title="SRG-OS-000042-GPOS-00020" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/libexec/openssh/ssh-keysign -F perm=x -F auid>=1000 -F auid!=unset -k privileged-ssh</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged ssh commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/libexec/openssh/ssh-keysign\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-ssh</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72179</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "ssh-keysign" command occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/libexec/openssh/ssh-keysign" /etc/audit/audit.rules -a always,exit -F path=/usr/libexec/openssh/ssh-keysign -F perm=x -F auid>=1000 -F auid!=unset -k privileged-ssh If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204557" severity="medium" conversionstatus="pass" title="SRG-OS-000042-GPOS-00020" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/bin/crontab -F perm=x -F auid>=1000 -F auid!=unset -k privileged-cron</ContainsLine> <Description><VulnDiscussion>Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/bin/crontab\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-cron</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72183</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "crontab" command occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/bin/crontab" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/crontab -F perm=x -F auid>=1000 -F auid!=unset -k privileged-cron If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204558" severity="medium" conversionstatus="pass" title="SRG-OS-000471-GPOS-00215" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/sbin/pam_timestamp_check -F perm=x -F auid>=1000 -F auid!=unset -k privileged-pam</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/sbin/pam_timestamp_check\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*privileged-pam</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72185</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "pam_timestamp_check" command occur. Check the auditing rules in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/sbin/pam_timestamp_check" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/pam_timestamp_check -F perm=x -F auid>=1000 -F auid!=unset -k privileged-pam If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204559.a" severity="medium" conversionstatus="pass" title="SRG-OS-000471-GPOS-00216" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b32 -S create_module -F auid>=1000 -F auid!=unset -k module-change</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b32\s*-S\s*create_module\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*module-change</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-78999.a</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "create_module" syscall occur. Check the auditing rules in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "create_module" /etc/audit/audit.rules -a always,exit -F arch=b32 -S create_module -F auid>=1000 -F auid!=unset -k module-change If both the "b32" and "b64" audit rules are not defined for the "create_module" syscall, this is a finding. </RawString> </Rule> <Rule id="V-204559.b" severity="medium" conversionstatus="pass" title="SRG-OS-000471-GPOS-00216" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b64 -S create_module -F auid>=1000 -F auid!=unset -k module-change</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b64\s*-S\s*create_module\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*module-change</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-78999.b</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "create_module" syscall occur. Check the auditing rules in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "create_module" /etc/audit/audit.rules -a always,exit -F arch=b64 -S create_module -F auid>=1000 -F auid!=unset -k module-change If both the "b32" and "b64" audit rules are not defined for the "create_module" syscall, this is a finding. </RawString> </Rule> <Rule id="V-204560.a" severity="medium" conversionstatus="pass" title="SRG-OS-000471-GPOS-00216" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b32 -S init_module,finit_module -F auid>=1000 -F auid!=unset -k modulechange</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance can be helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b32\s*-S\s*init_module,finit_module\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*modulechange</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72187.a</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "init_module" and "finit_module" syscalls. Check the auditing rules in "/etc/audit/audit.rules" with the following command: $ sudo grep init_module /etc/audit/audit.rules -a always,exit -F arch=b32 -S init_module,finit_module -F auid>=1000 -F auid!=unset -k modulechange If both the "b32" and "b64" audit rules are not defined for the "init_module" and "finit_module" syscalls, this is a finding. </RawString> </Rule> <Rule id="V-204560.b" severity="medium" conversionstatus="pass" title="SRG-OS-000471-GPOS-00216" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b64 -S init_module,finit_module -F auid>=1000 -F auid!=unset -k modulechange</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance can be helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b64\s*-S\s*init_module,finit_module\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*modulechange</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72187.b</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "init_module" and "finit_module" syscalls. Check the auditing rules in "/etc/audit/audit.rules" with the following command: $ sudo grep init_module /etc/audit/audit.rules -a always,exit -F arch=b64 -S init_module,finit_module -F auid>=1000 -F auid!=unset -k modulechange If both the "b32" and "b64" audit rules are not defined for the "init_module" and "finit_module" syscalls, this is a finding. </RawString> </Rule> <Rule id="V-204562.a" severity="medium" conversionstatus="pass" title="SRG-OS-000471-GPOS-00216" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b32 -S delete_module -F auid>=1000 -F auid!=unset -k module-change</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b32\s*-S\s*delete_module\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*module-change</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72189.a</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "delete_module" syscall occur. Check the auditing rules in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "delete_module" /etc/audit/audit.rules -a always,exit -F arch=b32 -S delete_module -F auid>=1000 -F auid!=unset -k module-change If both the "b32" and "b64" audit rules are not defined for the "delete_module" syscall, this is a finding. </RawString> </Rule> <Rule id="V-204562.b" severity="medium" conversionstatus="pass" title="SRG-OS-000471-GPOS-00216" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b64 -S delete_module -F auid>=1000 -F auid!=unset -k module-change</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b64\s*-S\s*delete_module\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*module-change</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72189.b</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "delete_module" syscall occur. Check the auditing rules in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "delete_module" /etc/audit/audit.rules -a always,exit -F arch=b64 -S delete_module -F auid>=1000 -F auid!=unset -k module-change If both the "b32" and "b64" audit rules are not defined for the "delete_module" syscall, this is a finding. </RawString> </Rule> <Rule id="V-204563" severity="medium" conversionstatus="pass" title="SRG-OS-000471-GPOS-00216" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F path=/usr/bin/kmod -F perm=x -F auid>=1000 -F auid!=unset -k modules</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*path\s*=\s*/usr/bin/kmod\s*-F\s*perm\s*=\s*x\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*modules</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72191</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records when successful/unsuccessful attempts to use the "kmod" command occur. Check the auditing rules in "/etc/audit/audit.rules" with the following command: $ sudo grep "/usr/bin/kmod" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/kmod -F perm=x -F auid>=1000 -F auid!=unset -k modules If the command does not return any output, this is a finding.</RawString> </Rule> <Rule id="V-204564" severity="medium" conversionstatus="pass" title="SRG-OS-000004-GPOS-00004" dscresource="nxFileLine"> <ContainsLine>-w /etc/passwd -p wa -k identity</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000303-GPOS-00120, SRG-OS-000476-GPOS-00221</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-w\s*/etc/passwd\s*-p\s*wa\s*-k\s*identity</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72197</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/passwd". Check the auditing rules in "/etc/audit/audit.rules" with the following command: # grep /etc/passwd /etc/audit/audit.rules -w /etc/passwd -p wa -k identity If the command does not return a line, or the line is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204565" severity="medium" conversionstatus="pass" title="SRG-OS-000004-GPOS-00004" dscresource="nxFileLine"> <ContainsLine>-w /etc/group -p wa -k identity</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter).</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-w\s*/etc/group\s*-p\s*wa\s*-k\s*identity</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-73165</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/group". Check the auditing rules in "/etc/audit/audit.rules" with the following command: # grep /etc/group /etc/audit/audit.rules -w /etc/group -p wa -k identity If the command does not return a line, or the line is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204566" severity="medium" conversionstatus="pass" title="SRG-OS-000004-GPOS-00004" dscresource="nxFileLine"> <ContainsLine>-w /etc/gshadow -p wa -k identity</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter).</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-w\s*/etc/gshadow\s*-p\s*wa\s*-k\s*identity</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-73167</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/gshadow". Check the auditing rules in "/etc/audit/audit.rules" with the following command: # grep /etc/gshadow /etc/audit/audit.rules -w /etc/gshadow -p wa -k identity If the command does not return a line, or the line is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204567" severity="medium" conversionstatus="pass" title="SRG-OS-000004-GPOS-00004" dscresource="nxFileLine"> <ContainsLine>-w /etc/shadow -p wa -k identity</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter).</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-w\s*/etc/shadow\s*-p\s*wa\s*-k\s*identity</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-73171</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/shadow. Check the auditing rules in "/etc/audit/audit.rules" with the following command: # grep /etc/shadow /etc/audit/audit.rules -w /etc/shadow -p wa -k identity If the command does not return a line, or the line is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204568" severity="medium" conversionstatus="pass" title="SRG-OS-000004-GPOS-00004" dscresource="nxFileLine"> <ContainsLine>-w /etc/security/opasswd -p wa -k identity</ContainsLine> <Description><VulnDiscussion>Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter).</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-w\s*/etc/security/opasswd\s*-p\s*wa\s*-k\s*identity</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-73173</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/security/opasswd. Check the auditing rules in "/etc/audit/audit.rules" with the following command: # grep /etc/security/opasswd /etc/audit/audit.rules -w /etc/security/opasswd -p wa -k identity If the command does not return a line, or the line is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204572.a" severity="medium" conversionstatus="pass" title="SRG-OS-000466-GPOS-00210" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b32 -S unlink,unlinkat,rename,renameat,rmdir -F auid>=1000 -F auid!=unset -k delete</ContainsLine> <Description><VulnDiscussion>If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance can be helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000466-GPOS-00210, SRG-OS-000467-GPOS-00211, SRG-OS-000468-GPOS-00212, SRG-OS-000392-GPOS-00172</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b32\s*-S\s*unlink,unlinkat,rename,renameat,rmdir\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*delete</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72205.a</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "unlink", "unlinkat", "rename", "renameat", and "rmdir" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep 'unlink\|rename\|rmdir' /etc/audit/audit.rules -a always,exit -F arch=b32 -S unlink,unlinkat,rename,renameat,rmdir -F auid>=1000 -F auid!=unset -k delete If both the "b32" and "b64" audit rules are not defined for the "unlink", "unlinkat", "rename", "renameat", and "rmdir" syscalls, this is a finding. </RawString> </Rule> <Rule id="V-204572.b" severity="medium" conversionstatus="pass" title="SRG-OS-000466-GPOS-00210" dscresource="nxFileLine"> <ContainsLine>-a always,exit -F arch=b64 -S unlink,unlinkat,rename,renameat,rmdir -F auid>=1000 -F auid!=unset -k delete</ContainsLine> <Description><VulnDiscussion>If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance can be helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000466-GPOS-00210, SRG-OS-000467-GPOS-00211, SRG-OS-000468-GPOS-00212, SRG-OS-000392-GPOS-00172</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*-a\s*always,exit\s*-F\s*arch\s*=\s*b64\s*-S\s*unlink,unlinkat,rename,renameat,rmdir\s*-F\s*auid>\s*=\s*1000\s*-F\s*auid!\s*=\s*unset\s*-k\s*delete</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/audit/rules.d/audit.rules</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72205.b</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "unlink", "unlinkat", "rename", "renameat", and "rmdir" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep 'unlink\|rename\|rmdir' /etc/audit/audit.rules -a always,exit -F arch=b64 -S unlink,unlinkat,rename,renameat,rmdir -F auid>=1000 -F auid!=unset -k delete If both the "b32" and "b64" audit rules are not defined for the "unlink", "unlinkat", "rename", "renameat", and "rmdir" syscalls, this is a finding. </RawString> </Rule> <Rule id="V-204578" severity="medium" conversionstatus="pass" title="SRG-OS-000033-GPOS-00014" dscresource="nxFileLine"> <ContainsLine>Ciphers aes256-ctr,aes192-ctr,aes128-ctr</ContainsLine> <Description><VulnDiscussion>Unapproved mechanisms that are used for authentication to the cryptographic module are not verified and therefore cannot be relied upon to provide confidentiality or integrity, and DoD data may be compromised. Operating systems utilizing encryption are required to use FIPS-compliant mechanisms for authenticating to cryptographic modules. FIPS 140-2 is the current standard for validating that mechanisms used to access cryptographic modules utilize authentication that meets DoD requirements. This allows for Security Levels 1, 2, 3, or 4 for use on a general purpose computing system. The system will attempt to use the first cipher presented by the client that matches the server list. Listing the values "strongest to weakest" is a method to ensure the use of the strongest cipher available to secure the SSH connection. Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000120-GPOS-00061, SRG-OS-000125-GPOS-00065, SRG-OS-000250-GPOS-00093, SRG-OS-000393-GPOS-00173</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*Ciphers.*|^\s*Ciphers\s*aes128-ctr.*|^\s*Ciphers\s*aes192-ctr.*</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72221</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system uses mechanisms meeting the requirements of applicable federal laws, Executive orders, directives, policies, regulations, standards, and guidance for authentication to a cryptographic module. The location of the "sshd_config" file may vary if a different daemon is in use. Inspect the "Ciphers" configuration with the following command: # grep -i ciphers /etc/ssh/sshd_config Ciphers aes256-ctr,aes192-ctr,aes128-ctr If any ciphers other than "aes256-ctr", "aes192-ctr", or "aes128-ctr" are listed, the order differs from the example above, the "Ciphers" keyword is missing, or the returned line is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204579.b" severity="medium" conversionstatus="pass" title="SRG-OS-000163-GPOS-00072" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle session will also free up resources committed by the managed network element. Terminating network connections associated with communications sessions includes, for example, de-allocating associated TCP/IP address/port pairs at the operating system level and de-allocating networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. This does not mean that the operating system terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session. Satisfies: SRG-OS-000029-GPOS-00010, SRG-OS-000163-GPOS-00072</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/profile.d/tmout.sh</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72223.b</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the following statement is true when leveraging the correct nxFileLine ContainsLine format: "If the file "/etc/profile.d/tmout.sh" does not exist with the contents shown above, the value of "TMOUT" is greater than 900, or the timeout values are commented out, this is a finding.</OrganizationValueTestString> <RawString>Verify the operating system terminates all network connections associated with a communications session at the end of the session or based on inactivity. Check the value of the system inactivity timeout with the following command: $ sudo grep -irw tmout /etc/profile /etc/bashrc /etc/profile.d etc/profile.d/tmout.sh:declare -xr TMOUT=900 If conflicting results are returned, this is a finding. If "TMOUT" is not set to "900" or less to enforce session termination after inactivity, this is a finding.</RawString> </Rule> <Rule id="V-204579.c" severity="medium" conversionstatus="pass" title="SRG-OS-000163-GPOS-00072" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle session will also free up resources committed by the managed network element. Terminating network connections associated with communications sessions includes, for example, de-allocating associated TCP/IP address/port pairs at the operating system level and de-allocating networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. This does not mean that the operating system terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session. Satisfies: SRG-OS-000029-GPOS-00010, SRG-OS-000163-GPOS-00072</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/bashrc</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72223.c</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the following statement is true when leveraging the correct nxFileLine ContainsLine format: "If the file "/etc/bashrc" does not exist with the contents shown above, the value of "TMOUT" is greater than 900, or the timeout values are commented out, this is a finding.</OrganizationValueTestString> <RawString>Verify the operating system terminates all network connections associated with a communications session at the end of the session or based on inactivity. Check the value of the system inactivity timeout with the following command: $ sudo grep -irw tmout /etc/profile /etc/bashrc /etc/profile.d etc/profile.d/tmout.sh:declare -xr TMOUT=900 If conflicting results are returned, this is a finding. If "TMOUT" is not set to "900" or less to enforce session termination after inactivity, this is a finding.</RawString> </Rule> <Rule id="V-204579.d" severity="medium" conversionstatus="pass" title="SRG-OS-000163-GPOS-00072" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle session will also free up resources committed by the managed network element. Terminating network connections associated with communications sessions includes, for example, de-allocating associated TCP/IP address/port pairs at the operating system level and de-allocating networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. This does not mean that the operating system terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session. Satisfies: SRG-OS-000029-GPOS-00010, SRG-OS-000163-GPOS-00072</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/profile</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72223.d</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the following statement is true when leveraging the correct nxFileLine ContainsLine format: "If the file "/etc/profile" does not exist with the contents shown above, the value of "TMOUT" is greater than 900, or the timeout values are commented out, this is a finding.</OrganizationValueTestString> <RawString>Verify the operating system terminates all network connections associated with a communications session at the end of the session or based on inactivity. Check the value of the system inactivity timeout with the following command: $ sudo grep -irw tmout /etc/profile /etc/bashrc /etc/profile.d etc/profile.d/tmout.sh:declare -xr TMOUT=900 If conflicting results are returned, this is a finding. If "TMOUT" is not set to "900" or less to enforce session termination after inactivity, this is a finding.</RawString> </Rule> <Rule id="V-204580" severity="medium" conversionstatus="pass" title="SRG-OS-000023-GPOS-00006" dscresource="nxFileLine"> <ContainsLine>banner /etc/issue</ContainsLine> <Description><VulnDiscussion>Display of a standardized and approved use notification before granting access to the publicly accessible operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. System use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist. The banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for operating systems that can accommodate banners of 1300 characters: "You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details." Satisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000024-GPOS-00007 , SRG-OS-000228-GPOS-00088</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*banner\s*/etc/issue</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72225</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify any publicly accessible connection to the operating system displays the Standard Mandatory DoD Notice and Consent Banner before granting access to the system. Check for the location of the banner file being used with the following command: # grep -i banner /etc/ssh/sshd_config banner /etc/issue This command will return the banner keyword and the name of the file that contains the ssh banner (in this case "/etc/issue"). If the line is commented out, this is a finding. View the file specified by the banner keyword to check that it matches the text of the Standard Mandatory DoD Notice and Consent Banner: "You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details." If the system does not display a graphical logon banner or the banner does not match the Standard Mandatory DoD Notice and Consent Banner, this is a finding. If the text in the file does not match the Standard Mandatory DoD Notice and Consent Banner, this is a finding.</RawString> </Rule> <Rule id="V-204587" severity="medium" conversionstatus="pass" title="SRG-OS-000163-GPOS-00072" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>Terminating an idle SSH session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle SSH session will also free up resources committed by the managed network element. Terminating network connections associated with communications sessions includes, for example, de-allocating associated TCP/IP address/port pairs at the operating system level and de-allocating networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. This does not mean that the operating system terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session. Satisfies: SRG-OS-000163-GPOS-00072, SRG-OS-000279-GPOS-00109</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72237</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the following statement is true when leveraging the correct nxFileLine ContainsLine format: "If "ClientAliveInterval" has a value that is greater than "600" and is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding." </OrganizationValueTestString> <RawString>Verify the operating system automatically terminates a user session after inactivity time-outs have expired. Check for the value of the "ClientAliveInterval" keyword with the following command: # grep -iw clientaliveinterval /etc/ssh/sshd_config ClientAliveInterval 600 If "ClientAliveInterval" is not configured, commented out, or has a value of "0", this is a finding. If "ClientAliveInterval" has a value that is greater than "600" and is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.</RawString> </Rule> <Rule id="V-204588" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFileLine"> <ContainsLine>RhostsRSAAuthentication no</ContainsLine> <Description><VulnDiscussion>Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*RhostsRSAAuthentication.*$|^RhostsRSAAuthentication\s*(?!no\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72239</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Check the version of the operating system with the following command: # cat /etc/redhat-release If the release is 7.4 or newer this requirement is Not Applicable. Verify the SSH daemon does not allow authentication using RSA rhosts authentication. To determine how the SSH daemon's "RhostsRSAAuthentication" option is set, run the following command: # grep RhostsRSAAuthentication /etc/ssh/sshd_config RhostsRSAAuthentication no If the value is returned as "yes", the returned line is commented out, or no output is returned, this is a finding.</RawString> </Rule> <Rule id="V-204589" severity="medium" conversionstatus="pass" title="SRG-OS-000163-GPOS-00072" dscresource="nxFileLine"> <ContainsLine>ClientAliveCountMax 0</ContainsLine> <Description><VulnDiscussion>Terminating an idle SSH session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle SSH session will also free up resources committed by the managed network element. Terminating network connections associated with communications sessions includes, for example, de-allocating associated TCP/IP address/port pairs at the operating system level and de-allocating networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. This does not mean that the operating system terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session. Satisfies: SRG-OS-000163-GPOS-00072, SRG-OS-000279-GPOS-00109</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*ClientAliveCountMax.*$|^ClientAliveCountMax\s*(?!0\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72241</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system automatically terminates a user session after inactivity time-outs have expired. Check for the value of the "ClientAliveCountMax" keyword with the following command: # grep -i clientalivecount /etc/ssh/sshd_config ClientAliveCountMax 0 If "ClientAliveCountMax" is not set to "0", this is a finding.</RawString> </Rule> <Rule id="V-204590" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFileLine"> <ContainsLine>IgnoreRhosts yes</ContainsLine> <Description><VulnDiscussion>Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*IgnoreRhosts.*$|^IgnoreRhosts\s*(?!yes\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72243</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the SSH daemon does not allow authentication using known hosts authentication. To determine how the SSH daemon's "IgnoreRhosts" option is set, run the following command: # grep -i IgnoreRhosts /etc/ssh/sshd_config IgnoreRhosts yes If the value is returned as "no", the returned line is commented out, or no output is returned, this is a finding.</RawString> </Rule> <Rule id="V-204591" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFileLine"> <ContainsLine>PrintLastLog yes</ContainsLine> <Description><VulnDiscussion>Providing users with feedback on when account accesses via SSH last occurred facilitates user recognition and reporting of unauthorized account use.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*PrintLastLog.*$|^PrintLastLog\s*(?!yes\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72245</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify SSH provides users with feedback on when account accesses last occurred. Check that "PrintLastLog" keyword in the sshd daemon configuration file is used and set to "yes" with the following command: # grep -i printlastlog /etc/ssh/sshd_config PrintLastLog yes If the "PrintLastLog" keyword is set to "no", is missing, or is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204592" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFileLine"> <ContainsLine>PermitRootLogin no</ContainsLine> <Description><VulnDiscussion>Even though the communications channel may be encrypted, an additional layer of security is gained by extending the policy of not logging on directly as root. In addition, logging on with a user-specific account provides individual accountability of actions performed on the system.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*PermitRootLogin.*$|^PermitRootLogin\s*(?!no\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72247</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify remote access using SSH prevents users from logging on directly as root. Check that SSH prevents users from logging on directly as root with the following command: # grep -i permitrootlogin /etc/ssh/sshd_config PermitRootLogin no If the "PermitRootLogin" keyword is set to "yes", is missing, or is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204593" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFileLine"> <ContainsLine>IgnoreUserKnownHosts yes</ContainsLine> <Description><VulnDiscussion>Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*IgnoreUserKnownHosts.*$|^IgnoreUserKnownHosts\s*(?!yes\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72249</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the SSH daemon does not allow authentication using known hosts authentication. To determine how the SSH daemon's "IgnoreUserKnownHosts" option is set, run the following command: # grep -i IgnoreUserKnownHosts /etc/ssh/sshd_config IgnoreUserKnownHosts yes If the value is returned as "no", the returned line is commented out, or no output is returned, this is a finding.</RawString> </Rule> <Rule id="V-204594" severity="high" conversionstatus="pass" title="SRG-OS-000074-GPOS-00042" dscresource="nxFileLine"> <ContainsLine>Protocol 2</ContainsLine> <Description><VulnDiscussion>SSHv1 is an insecure implementation of the SSH protocol and has many well-known vulnerability exploits. Exploits of the SSH daemon could provide immediate root access to the system. Satisfies: SRG-OS-000074-GPOS-00042, SRG-OS-000480-GPOS-00227</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*Protocol.*$|^Protocol\s*(?!2\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72251</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Check the version of the operating system with the following command: # cat /etc/redhat-release If the release is 7.4 or newer this requirement is Not Applicable. Verify the SSH daemon is configured to only use the SSHv2 protocol. Check that the SSH daemon is configured to only use the SSHv2 protocol with the following command: # grep -i protocol /etc/ssh/sshd_config Protocol 2 #Protocol 1,2 If any protocol line other than "Protocol 2" is uncommented, this is a finding.</RawString> </Rule> <Rule id="V-204595" severity="medium" conversionstatus="pass" title="SRG-OS-000250-GPOS-00093" dscresource="nxFileLine"> <ContainsLine>MACs hmac-sha2-512,hmac-sha2-256</ContainsLine> <Description><VulnDiscussion>DoD information systems are required to use FIPS 140-2 approved cryptographic hash functions. The only SSHv2 hash algorithm meeting this requirement is SHA. The system will attempt to use the first hash presented by the client that matches the server list. Listing the values "strongest to weakest" is a method to ensure the use of the strongest hash available to secure the SSH connection.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*MACs.*|\s*MACs\s*hmac-(?!sha2-512).*</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72253</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the SSH daemon is configured to only use MACs employing FIPS 140-2-approved hashes. Note: If RHEL-07-021350 is a finding, this is automatically a finding as the system cannot implement FIPS 140-2-approved cryptographic algorithms and hashes. Check that the SSH daemon is configured to only use MACs employing FIPS 140-2-approved hashes with the following command: # grep -i macs /etc/ssh/sshd_config MACs hmac-sha2-512,hmac-sha2-256 If any hashes other than "hmac-sha2-512" or "hmac-sha2-256" are listed, the order differs from the example above, they are missing, or the returned line is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204598" severity="medium" conversionstatus="pass" title="SRG-OS-000364-GPOS-00151" dscresource="nxFileLine"> <ContainsLine>GSSAPIAuthentication no</ContainsLine> <Description><VulnDiscussion>GSSAPI authentication is used to provide additional authentication mechanisms to applications. Allowing GSSAPI authentication through SSH exposes the system's GSSAPI to remote hosts, increasing the attack surface of the system. GSSAPI authentication must be disabled unless needed.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*GSSAPIAuthentication.*$|^GSSAPIAuthentication\s*(?!no\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72259</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the SSH daemon does not permit GSSAPI authentication unless approved. Check that the SSH daemon does not permit GSSAPI authentication with the following command: # grep -i gssapiauth /etc/ssh/sshd_config GSSAPIAuthentication no If the "GSSAPIAuthentication" keyword is missing, is set to "yes" and is not documented with the Information System Security Officer (ISSO), or the returned line is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204599" severity="medium" conversionstatus="pass" title="SRG-OS-000364-GPOS-00151" dscresource="nxFileLine"> <ContainsLine>KerberosAuthentication no</ContainsLine> <Description><VulnDiscussion>Kerberos authentication for SSH is often implemented using Generic Security Service Application Program Interface (GSSAPI). If Kerberos is enabled through SSH, the SSH daemon provides a means of access to the system's Kerberos implementation. Vulnerabilities in the system's Kerberos implementation may then be subject to exploitation. To reduce the attack surface of the system, the Kerberos authentication mechanism within SSH must be disabled for systems not using this capability.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*KerberosAuthentication.*$|^KerberosAuthentication\s*(?!no\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72261</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the SSH daemon does not permit Kerberos to authenticate passwords unless approved. Check that the SSH daemon does not permit Kerberos to authenticate passwords with the following command: # grep -i kerberosauth /etc/ssh/sshd_config KerberosAuthentication no If the "KerberosAuthentication" keyword is missing, or is set to "yes" and is not documented with the Information System Security Officer (ISSO), or the returned line is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204600" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFileLine"> <ContainsLine>StrictModes yes</ContainsLine> <Description><VulnDiscussion>If other users have access to modify user-specific SSH configuration files, they may be able to log on to the system as another user.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*StrictModes.*$|^StrictModes\s*(?!yes\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72263</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the SSH daemon performs strict mode checking of home directory configuration files. The location of the "sshd_config" file may vary if a different daemon is in use. Inspect the "sshd_config" file with the following command: # grep -i strictmodes /etc/ssh/sshd_config StrictModes yes If "StrictModes" is set to "no", is missing, or the returned line is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204601" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFileLine"> <ContainsLine>UsePrivilegeSeparation sandbox</ContainsLine> <Description><VulnDiscussion>SSH daemon privilege separation causes the SSH process to drop root privileges when not needed, which would decrease the impact of software vulnerabilities in the unprivileged section.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*UsePrivilegeSeparation.*$|^UsePrivilegeSeparation\s*(?!sandbox\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72265</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the SSH daemon performs privilege separation. Check that the SSH daemon performs privilege separation with the following command: # grep -i usepriv /etc/ssh/sshd_config UsePrivilegeSeparation sandbox If the "UsePrivilegeSeparation" keyword is set to "no", is missing, or the returned line is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204602" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFileLine"> <ContainsLine>Compression delayed</ContainsLine> <Description><VulnDiscussion>If compression is allowed in an SSH connection prior to authentication, vulnerabilities in the compression software could result in compromise of the system from an unauthenticated connection, potentially with root privileges.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*Compression.*$|^Compression\s*(?!delayed\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72267</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Note: For RHEL 7.4 and above, this requirement is not applicable. Verify the SSH daemon performs compression after a user successfully authenticates. Check that the SSH daemon performs compression after a user successfully authenticates with the following command: # grep -i compression /etc/ssh/sshd_config Compression delayed If the "Compression" keyword is set to "yes", is missing, or the returned line is commented out, this is a finding.</RawString> </Rule> <Rule id="V-204622" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFileLine"> <ContainsLine>X11Forwarding no</ContainsLine> <Description><VulnDiscussion>The security risk of using X11 forwarding is that the client's X11 display server may be exposed to attack when the SSH client requests forwarding. A system administrator may have a stance in which they want to protect clients that may expose themselves to attack by unwittingly requesting X11 forwarding, which can warrant a ''no'' setting. X11 forwarding should be enabled with caution. Users with the ability to bypass file permissions on the remote host (for the user's X11 authorization database) can access the local X11 display through the forwarded connection. An attacker may then be able to perform activities such as keystroke monitoring if the ForwardX11Trusted option is also enabled. If X11 services are not required for the system's intended function, they should be disabled or restricted as appropriate to the system’s needs.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>^#\s*X11Forwarding.*$|^X11Forwarding\s*(?!no\b)\w*$</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72303</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Determine if X11Forwarding is disabled with the following command: # grep -i x11forwarding /etc/ssh/sshd_config | grep -v "^#" X11Forwarding no If the "X11Forwarding" keyword is set to "yes" and is not documented with the Information System Security Officer (ISSO) as an operational requirement or is missing, this is a finding.</RawString> </Rule> <Rule id="V-204623" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFileLine"> <ContainsLine>server_args = -s /var/lib/tftpboot</ContainsLine> <Description><VulnDiscussion>Restricting TFTP to a specific directory prevents remote users from copying, transferring, or overwriting system files.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*server_args\s*=\s*-s\s*/var/lib/tftpboot</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/xinetd.d/tftp</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72305</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the TFTP daemon is configured to operate in secure mode. Check to see if a TFTP server has been installed with the following commands: # yum list installed tftp-server tftp-server.x86_64 x.x-x.el7 rhel-7-server-rpms If a TFTP server is not installed, this is Not Applicable. If a TFTP server is installed, check for the server arguments with the following command: # grep server_args /etc/xinetd.d/tftp server_args = -s /var/lib/tftpboot If the "server_args" line does not have a "-s" option and a subdirectory is not assigned, this is a finding.</RawString> </Rule> <Rule id="V-233307" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFileLine"> <ContainsLine>X11UseLocalhost yes</ContainsLine> <Description><VulnDiscussion>When X11 forwarding is enabled, there may be additional exposure to the server and client displays if the sshd proxy display is configured to listen on the wildcard address. By default, sshd binds the forwarding server to the loopback address and sets the hostname part of the DIPSLAY environment variable to localhost. This prevents remote hosts from connecting to the proxy display.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*X11UseLocalhost\s*yes</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the SSH daemon prevents remote hosts from connecting to the proxy display. Check the SSH X11UseLocalhost setting with the following command: # sudo grep -i x11uselocalhost /etc/ssh/sshd_config X11UseLocalhost yes If the "X11UseLocalhost" keyword is set to "no", is missing, or is commented out, this is a finding.</RawString> </Rule> <Rule id="V-244557" severity="medium" conversionstatus="pass" title="SRG-OS-000080-GPOS-00048" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>If the system does not require valid authentication before it boots into single-user or maintenance mode, anyone who invokes single-user or maintenance mode is granted privileged access to all files on the system. GRUB 2 is the default boot loader for RHEL 7 and is designed to require a password to boot into single-user mode or make modifications to the boot menu. The GRUB 2 superuser account is an account of last resort. Establishing a unique username for this account hardens the boot loader against brute force attacks. Due to the nature of the superuser account database being distinct from the OS account database, this allows the use of a username that is not among those within the OS account database. Examples of non-unique superusers names are root, superuser, unlock, etc.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/boot/grub2/grub.cfg</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>"set superusers =" is set to a unique name in /boot/grub2/grub.cfg</OrganizationValueTestString> <RawString>For systems that use UEFI, this is Not Applicable. For systems that are running a version of RHEL prior to 7.2, this is Not Applicable. Verify that a unique name is set as the "superusers" account: # grep -iw "superusers" /boot/grub2/grub.cfg set superusers="[someuniquestringhere]" export superusers If "superusers" is identical to any OS account name or is missing a name, this is a finding.</RawString> </Rule> <Rule id="V-244558" severity="medium" conversionstatus="pass" title="SRG-OS-000080-GPOS-00048" dscresource="nxFileLine"> <ContainsLine> </ContainsLine> <Description><VulnDiscussion>If the system does not require valid authentication before it boots into single-user or maintenance mode, anyone who invokes single-user or maintenance mode is granted privileged access to all files on the system. GRUB 2 is the default boot loader for RHEL 7 and is designed to require a password to boot into single-user mode or make modifications to the boot menu. The GRUB 2 superuser account is an account of last resort. Establishing a unique username for this account hardens the boot loader against brute force attacks. Due to the nature of the superuser account database being distinct from the OS account database, this allows the use of a username that is not among those within the OS account database. Examples of non-unique superusers names are root, superuser, unlock, etc.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern> </DoesNotContainPattern> <DuplicateOf /> <FilePath>/boot/efi/EFI/redhat/grub.cfg</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>"set superusers =" is set to a unique name in /boot/efi/EFI/redhat/grub.cfg</OrganizationValueTestString> <RawString>For systems that use BIOS, this is Not Applicable. For systems that are running a version of RHEL prior to 7.2, this is Not Applicable. Verify that a unique name is set as the "superusers" account: $ sudo grep -iw "superusers" /boot/efi/EFI/redhat/grub.cfg set superusers="[someuniquestringhere]" export superusers If "superusers" is identical to any OS account name or is missing a name, this is a finding.</RawString> </Rule> <Rule id="V-255925" severity="medium" conversionstatus="pass" title="SRG-OS-000033-GPOS-00014" dscresource="nxFileLine"> <ContainsLine>KexAlgorithms ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256</ContainsLine> <Description><VulnDiscussion>The use of FIPS-validated cryptographic algorithms is enforced by enabling kernel FIPS mode. In the event that kernel FIPS mode is disabled, the use of nonvalidated cryptographic algorithms will be permitted systemwide. The SSH server configuration must manually define only FIPS-validated key exchange algorithms to prevent the use of nonvalidated algorithms.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*KexAlgorithms\s*ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/ssh/sshd_config</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that the SSH server is configured to use only FIPS-validated key exchange algorithms: $ sudo grep -i kexalgorithms /etc/ssh/sshd_config KexAlgorithms ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256 If "KexAlgorithms" is not configured, is commented out, or does not contain only the algorithms "ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256" in exact order, this is a finding.</RawString> </Rule> <Rule id="V-256969" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFileLine"> <ContainsLine>/etc/dconf/db/gdm.d/00-login-screen:disable-user-list=true</ContainsLine> <Description><VulnDiscussion>Leaving the user list enabled is a security risk as it allows anyone with physical access to the system to enumerate known user accounts without authenticated access to the system.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DoesNotContainPattern>#\s*/etc/dconf/db/gdm.d/00-login-screen:disable-user-list\s*=\s*true</DoesNotContainPattern> <DuplicateOf /> <FilePath>/etc/dconf/db/gdm.d/00-login-screen</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that the operating system is configured to disable the login screen user list for graphical user interfaces. Note: If the system does not have the GNOME Desktop installed, this requirement is Not Applicable. Verify that the login screen user list for the GNOME Desktop is disabled with the following command: $ sudo grep -is disable-user-list /etc/dconf/db/gdm.d/* /etc/dconf/db/gdm.d/00-login-screen:disable-user-list=true If the variable "disable-user-list" is not defined in a file under "/etc/dconf/db/gdm.d/", is not set to "true", is missing or commented out, this is a finding.</RawString> </Rule> </nxFileLineRule> <nxFileRule dscresourcemodule="nx"> <Rule id="V-204395" severity="medium" conversionstatus="pass" title="SRG-OS-000023-GPOS-00006" dscresource="nxFile"> <Contents>You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details.</Contents> <Description><VulnDiscussion>Display of a standardized and approved use notification before granting access to the operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. System use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist. The banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for operating systems that can accommodate banners of 1300 characters: "You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details." Satisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000024-GPOS-00007</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/issue</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71863</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system displays the Standard Mandatory DoD Notice and Consent Banner before granting access to the operating system via a command line user logon. Check to see if the operating system displays a banner at the command line logon screen with the following command: # more /etc/issue The command should return the following text: "You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details." If the operating system does not display a graphical logon banner or the banner does not match the Standard Mandatory DoD Notice and Consent Banner, this is a finding. If the text in the "/etc/issue" file does not match the Standard Mandatory DoD Notice and Consent Banner, this is a finding.</RawString> </Rule> <Rule id="V-204399.a" severity="medium" conversionstatus="pass" title="SRG-OS-000029-GPOS-00010" dscresource="nxFile"> <Contents>/org/gnome/desktop/screensaver/lock-delay</Contents> <Description><VulnDiscussion>A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/dconf/db/local.d/locks/session</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-73155.a</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system prevents a user from overriding a screensaver lock after a 15-minute period of inactivity for graphical user interfaces. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Determine which profile the system database is using with the following command: # grep system-db /etc/dconf/profile/user system-db:local Check for the lock delay setting with the following command: Note: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used. # grep -i lock-delay /etc/dconf/db/local.d/locks/* /org/gnome/desktop/screensaver/lock-delay If the command does not return a result, this is a finding.</RawString> </Rule> <Rule id="V-204449.a" severity="medium" conversionstatus="pass" title="SRG-OS-000114-GPOS-00059" dscresource="nxFile"> <Contents /> <Description><VulnDiscussion>USB mass storage permits easy introduction of unknown devices, thereby facilitating malicious activity. Satisfies: SRG-OS-000114-GPOS-00059, SRG-OS-000378-GPOS-00163, SRG-OS-000480-GPOS-00227</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/modprobe.d/usb-storage.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71983.a</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system disables the ability to load the USB Storage kernel module. # grep -r usb-storage /etc/modprobe.d/* | grep -i "/bin/true" | grep -v "^#" install usb-storage /bin/true If the command does not return any output, or the line is commented out, and use of USB Storage is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding. Verify the operating system disables the ability to use USB mass storage devices. Check to see if USB mass storage is disabled with the following command: # grep usb-storage /etc/modprobe.d/* | grep -i "blacklist" | grep -v "^#" blacklist usb-storage If the command does not return any output or the output is not "blacklist usb-storage", and use of USB storage devices is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.</RawString> </Rule> <Rule id="V-204449.b" severity="medium" conversionstatus="pass" title="SRG-OS-000114-GPOS-00059" dscresource="nxFile"> <Contents /> <Description><VulnDiscussion>USB mass storage permits easy introduction of unknown devices, thereby facilitating malicious activity. Satisfies: SRG-OS-000114-GPOS-00059, SRG-OS-000378-GPOS-00163, SRG-OS-000480-GPOS-00227</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/modprobe.d/blacklist.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71983.b</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system disables the ability to load the USB Storage kernel module. # grep -r usb-storage /etc/modprobe.d/* | grep -i "/bin/true" | grep -v "^#" install usb-storage /bin/true If the command does not return any output, or the line is commented out, and use of USB Storage is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding. Verify the operating system disables the ability to use USB mass storage devices. Check to see if USB mass storage is disabled with the following command: # grep usb-storage /etc/modprobe.d/* | grep -i "blacklist" | grep -v "^#" blacklist usb-storage If the command does not return any output or the output is not "blacklist usb-storage", and use of USB storage devices is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.</RawString> </Rule> <Rule id="V-204450.a" severity="medium" conversionstatus="pass" title="SRG-OS-000378-GPOS-00163" dscresource="nxFile"> <Contents /> <Description><VulnDiscussion>Disabling DCCP protects the system against exploitation of any flaws in the protocol implementation.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/modprobe.d/dccp.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-77821.a</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system disables the ability to load the DCCP kernel module. # grep -r dccp /etc/modprobe.d/* | grep -i "/bin/true" | grep -v "^#" install dccp /bin/true If the command does not return any output, or the line is commented out, and use of DCCP is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding. Verify the operating system disables the ability to use the DCCP kernel module. Check to see if the DCCP kernel module is disabled with the following command: # grep -i dccp /etc/modprobe.d/* | grep -i "blacklist" | grep -v "^#" blacklist dccp If the command does not return any output or the output is not "blacklist dccp", and use of the dccp kernel module is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.</RawString> </Rule> <Rule id="V-204576" severity="low" conversionstatus="pass" title="SRG-OS-000027-GPOS-00008" dscresource="nxFile"> <Contents> </Contents> <Description><VulnDiscussion>Operating system management includes the ability to control the number of users and user sessions that utilize an operating system. Limiting the number of allowed users and sessions per user is helpful in reducing the risks related to DoS attacks. This requirement addresses concurrent sessions for information system accounts and does not address concurrent sessions by single users via multiple system accounts. The maximum number of concurrent sessions should be defined based on mission needs and the operational environment for each system.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/security/limits.d/204576-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72217</LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the "maxlogins" value is set to "10" or less </OrganizationValueTestString> <RawString>Verify the operating system limits the number of concurrent sessions to "10" for all accounts and/or account types by issuing the following command: # grep "maxlogins" /etc/security/limits.conf /etc/security/limits.d/*.conf * hard maxlogins 10 This can be set as a global domain (with the * wildcard) but may be set differently for multiple domains. If the "maxlogins" item is missing, commented out, or the value is not set to "10" or less for all domains that have the "maxlogins" item assigned, this is a finding.</RawString> </Rule> <Rule id="V-204579.a" severity="medium" conversionstatus="pass" title="SRG-OS-000163-GPOS-00072" dscresource="nxFile"> <Contents /> <Description><VulnDiscussion>Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle session will also free up resources committed by the managed network element. Terminating network connections associated with communications sessions includes, for example, de-allocating associated TCP/IP address/port pairs at the operating system level and de-allocating networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. This does not mean that the operating system terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session. Satisfies: SRG-OS-000029-GPOS-00010, SRG-OS-000163-GPOS-00072</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/profile.d/tmout.sh</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72223.a</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system terminates all network connections associated with a communications session at the end of the session or based on inactivity. Check the value of the system inactivity timeout with the following command: $ sudo grep -irw tmout /etc/profile /etc/bashrc /etc/profile.d etc/profile.d/tmout.sh:declare -xr TMOUT=900 If conflicting results are returned, this is a finding. If "TMOUT" is not set to "900" or less to enforce session termination after inactivity, this is a finding.</RawString> </Rule> <Rule id="V-204584" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFile"> <Contents>kernel.randomize_va_space = 2</Contents> <Description><VulnDiscussion>Address space layout randomization (ASLR) makes it more difficult for an attacker to predict the location of attack code he or she has introduced into a process's address space during an attempt at exploitation. Additionally, ASLR also makes it more difficult for an attacker to know the location of existing code in order to repurpose it using return-oriented programming (ROP) techniques.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sysctl.d/204584-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-77825</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system implements virtual address space randomization. # grep -r kernel.randomize_va_space /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null kernel.randomize_va_space = 2 If "kernel.randomize_va_space" is not configured in the /etc/sysctl.conf file or or in any of the other sysctl.d directories, is commented out or does not have a value of "2", this is a finding. Check that the operating system implements virtual address space randomization with the following command: # /sbin/sysctl -a | grep kernel.randomize_va_space kernel.randomize_va_space = 2 If "kernel.randomize_va_space" does not have a value of "2", this is a finding. If conflicting results are returned, this is a finding.</RawString> </Rule> <Rule id="V-204609" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFile"> <Contents>net.ipv4.conf.all.accept_source_route = 0</Contents> <Description><VulnDiscussion>Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv4 forwarding is enabled and the system is functioning as a router.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sysctl.d/204609-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72283</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the system does not accept IPv4 source-routed packets. # grep -r net.ipv4.conf.all.accept_source_route /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null net.ipv4.conf.all.accept_source_route = 0 If "net.ipv4.conf.all.accept_source_route" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "0", this is a finding. Check that the operating system implements the accept source route variable with the following command: # /sbin/sysctl -a | grep net.ipv4.conf.all.accept_source_route net.ipv4.conf.all.accept_source_route = 0 If the returned line does not have a value of "0", this is a finding. If conflicting results are returned, this is a finding.</RawString> </Rule> <Rule id="V-204610" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFile"> <Contents>net.ipv4.conf.all.rp_filter = 1</Contents> <Description><VulnDiscussion>Enabling reverse path filtering drops packets with source addresses that should not have been able to be received on the interface they were received on. It should not be used on systems that are routers for complicated networks, but is helpful for end hosts and routers serving small networks.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sysctl.d/204610-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-92251</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the system uses a reverse-path filter for IPv4: # grep -r net.ipv4.conf.all.rp_filter /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null net.ipv4.conf.all.rp_filter = 1 If "net.ipv4.conf.all.rp_filter" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "1", this is a finding. Check that the operating system implements the accept source route variable with the following command: # /sbin/sysctl -a | grep net.ipv4.conf.all.rp_filter net.ipv4.conf.all.rp_filter = 1 If the returned line does not have a value of "1", this is a finding. If conflicting results are returned, this is a finding.</RawString> </Rule> <Rule id="V-204611" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFile"> <Contents>net.ipv4.conf.default.rp_filter = 1</Contents> <Description><VulnDiscussion>Enabling reverse path filtering drops packets with source addresses that should not have been able to be received on the interface they were received on. It should not be used on systems which are routers for complicated networks, but is helpful for end hosts and routers serving small networks.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sysctl.d/204611-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-92253</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the system uses a reverse-path filter for IPv4: # grep -r net.ipv4.conf.default.rp_filter /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null net.ipv4.conf.default.rp_filter = 1 If "net.ipv4.conf.default.rp_filter" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "1", this is a finding. Check that the operating system implements the accept source route variable with the following command: # /sbin/sysctl -a | grep net.ipv4.conf.default.rp_filter net.ipv4.conf.default.rp_filter = 1 If the returned line does not have a value of "1", this is a finding. If conflicting results are returned, this is a finding.</RawString> </Rule> <Rule id="V-204612" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFile"> <Contents>net.ipv4.conf.default.accept_source_route = 0</Contents> <Description><VulnDiscussion>Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv4 forwarding is enabled and the system is functioning as a router.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sysctl.d/204612-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72285</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the system does not accept IPv4 source-routed packets by default. # grep -r net.ipv4.conf.default.accept_source_route /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null net.ipv4.conf.default.accept_source_route = 0 If "net.ipv4.conf.default.accept_source_route" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "0", this is a finding. Check that the operating system implements the accept source route variable with the following command: # /sbin/sysctl -a | grep net.ipv4.conf.default.accept_source_route net.ipv4.conf.default.accept_source_route = 0 If the returned line does not have a value of "0", this is a finding. If conflicting results are returned, this is a finding.</RawString> </Rule> <Rule id="V-204613" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFile"> <Contents>net.ipv4.icmp_echo_ignore_broadcasts = 1</Contents> <Description><VulnDiscussion>Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sysctl.d/204613-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72287</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the system does not respond to IPv4 ICMP echoes sent to a broadcast address. # grep -r net.ipv4.icmp_echo_ignore_broadcasts /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null If "net.ipv4.icmp_echo_ignore_broadcasts" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "1", this is a finding. Check that the operating system implements the "icmp_echo_ignore_broadcasts" variable with the following command: # /sbin/sysctl -a | grep net.ipv4.icmp_echo_ignore_broadcasts net.ipv4.icmp_echo_ignore_broadcasts = 1 If the returned line does not have a value of "1", this is a finding. If conflicting results are returned, this is a finding.</RawString> </Rule> <Rule id="V-204614" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFile"> <Contents>net.ipv4.conf.default.accept_redirects = 0</Contents> <Description><VulnDiscussion>ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sysctl.d/204614-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72289</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the system will not accept IPv4 ICMP redirect messages. # grep -r net.ipv4.conf.default.accept_redirects /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null If "net.ipv4.conf.default.accept_redirects" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "0", this is a finding. Check that the operating system implements the value of the "accept_redirects" variables with the following command: # /sbin/sysctl -a | grep net.ipv4.conf.default.accept_redirects net.ipv4.conf.default.accept_redirects = 0 If the returned line does not have a value of "0", this is a finding. If conflicting results are returned, this is a finding.</RawString> </Rule> <Rule id="V-204615" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFile"> <Contents>net.ipv4.conf.all.accept_redirects = 0</Contents> <Description><VulnDiscussion>ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sysctl.d/204615-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-73175</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the system ignores IPv4 ICMP redirect messages. # grep -r net.ipv4.conf.all.accept_redirects /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null If "net.ipv4.conf.all.accept_redirects" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "0", this is a finding. Check that the operating system implements the "accept_redirects" variables with the following command: # /sbin/sysctl -a | grep net.ipv4.conf.all.accept_redirects net.ipv4.conf.all.accept_redirects = 0 If the returned line does not have a value of "0", this is a finding. If conflicting results are returned, this is a finding.</RawString> </Rule> <Rule id="V-204616" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFile"> <Contents>net.ipv4.conf.default.send_redirects = 0</Contents> <Description><VulnDiscussion>ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table, possibly revealing portions of the network topology.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sysctl.d/204616-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72291</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the system does not allow interfaces to perform IPv4 ICMP redirects by default. # grep -r net.ipv4.conf.default.send_redirects /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null If "net.ipv4.conf.default.send_redirects" is not configured in the "/etc/sysctl.conf" file or in any of the other sysctl.d directories, is commented out or does not have a value of "0", this is a finding. Check that the operating system implements the "default send_redirects" variables with the following command: # /sbin/sysctl -a | grep net.ipv4.conf.default.send_redirects net.ipv4.conf.default.send_redirects = 0 If the returned line does not have a value of "0", this is a finding. If conflicting results are returned, this is a finding.</RawString> </Rule> <Rule id="V-204617" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFile"> <Contents>net.ipv4.conf.all.send_redirects = 0</Contents> <Description><VulnDiscussion>ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table, possibly revealing portions of the network topology.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sysctl.d/204617-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72293</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the system does not send IPv4 ICMP redirect messages. # grep -r net.ipv4.conf.all.send_redirects /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null If "net.ipv4.conf.all.send_redirects" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out or does not have a value of "0", this is a finding. Check that the operating system implements the "all send_redirects" variables with the following command: # /sbin/sysctl -a | grep net.ipv4.conf.all.send_redirects net.ipv4.conf.all.send_redirects = 0 If the returned line does not have a value of "0", this is a finding. If conflicting results are returned, this is a finding.</RawString> </Rule> <Rule id="V-204625" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFile"> <Contents>net.ipv4.ip_forward = 0</Contents> <Description><VulnDiscussion>Routing protocol daemons are typically used on routers to exchange network topology information with other routers. If this software is used when not required, system network information may be unnecessarily transmitted across the network.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sysctl.d/204625-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72309</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the system is not performing packet forwarding, unless the system is a router. # grep -r net.ipv4.ip_forward /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null net.ipv4.ip_forward = 0 If "net.ipv4.ip_forward" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "0", this is a finding. Check that the operating system does not implement IP forwarding using the following command: # /sbin/sysctl -a | grep net.ipv4.ip_forward net.ipv4.ip_forward = 0 If IP forwarding value is "1" and the system is hosting any application, database, or web servers, this is a finding. If conflicting results are returned, this is a finding.</RawString> </Rule> <Rule id="V-204630" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFile"> <Contents>net.ipv6.conf.all.accept_source_route = 0</Contents> <Description><VulnDiscussion>Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv6 forwarding is enabled and the system is functioning as a router.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sysctl.d/204630-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72319</LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>If IPv6 is not enabled, the key will not exist, and this is Not Applicable. Verify the system does not accept IPv6 source-routed packets. # grep -r net.ipv6.conf.all.accept_source_route /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null net.ipv6.conf.all.accept_source_route = 0 If "net.ipv6.conf.all.accept_source_route" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out or does not have a value of "0", this is a finding. Check that the operating system implements the accept source route variable with the following command: # /sbin/sysctl -a | grep net.ipv6.conf.all.accept_source_route net.ipv6.conf.all.accept_source_route = 0 If the returned lines do not have a value of "0", this is a finding. If conflicting results are returned, this is a finding.</RawString> </Rule> <Rule id="V-237634.a" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFile"> <Contents>Defaults !targetpw</Contents> <Description><VulnDiscussion>The sudoers security policy requires that users authenticate themselves before they can use sudo. When sudoers requires authentication, it validates the invoking user's credentials. If the rootpw, targetpw, or runaspw flags are defined and not disabled, by default the operating system will prompt the invoking user for the "root" user password. For more information on each of the listed configurations, reference the sudoers(5) manual page.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sudoers.d/237634a-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that the sudoers security policy is configured to use the invoking user's password for privilege escalation. $ sudo grep -Eir '(rootpw|targetpw|runaspw)' /etc/sudoers /etc/sudoers.d* | grep -v '#' /etc/sudoers:Defaults !targetpw /etc/sudoers:Defaults !rootpw /etc/sudoers:Defaults !runaspw If conflicting results are returned, this is a finding. If "Defaults !targetpw" is not defined, this is a finding. If "Defaults !rootpw" is not defined, this is a finding. If "Defaults !runaspw" is not defined, this is a finding.</RawString> </Rule> <Rule id="V-237634.b" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFile"> <Contents>Defaults !rootpw</Contents> <Description><VulnDiscussion>The sudoers security policy requires that users authenticate themselves before they can use sudo. When sudoers requires authentication, it validates the invoking user's credentials. If the rootpw, targetpw, or runaspw flags are defined and not disabled, by default the operating system will prompt the invoking user for the "root" user password. For more information on each of the listed configurations, reference the sudoers(5) manual page.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sudoers.d/237634b-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that the sudoers security policy is configured to use the invoking user's password for privilege escalation. $ sudo grep -Eir '(rootpw|targetpw|runaspw)' /etc/sudoers /etc/sudoers.d* | grep -v '#' /etc/sudoers:Defaults !targetpw /etc/sudoers:Defaults !rootpw /etc/sudoers:Defaults !runaspw If conflicting results are returned, this is a finding. If "Defaults !targetpw" is not defined, this is a finding. If "Defaults !rootpw" is not defined, this is a finding. If "Defaults !runaspw" is not defined, this is a finding.</RawString> </Rule> <Rule id="V-237634.c" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxFile"> <Contents>Defaults !runaspw</Contents> <Description><VulnDiscussion>The sudoers security policy requires that users authenticate themselves before they can use sudo. When sudoers requires authentication, it validates the invoking user's credentials. If the rootpw, targetpw, or runaspw flags are defined and not disabled, by default the operating system will prompt the invoking user for the "root" user password. For more information on each of the listed configurations, reference the sudoers(5) manual page.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sudoers.d/237634c-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that the sudoers security policy is configured to use the invoking user's password for privilege escalation. $ sudo grep -Eir '(rootpw|targetpw|runaspw)' /etc/sudoers /etc/sudoers.d* | grep -v '#' /etc/sudoers:Defaults !targetpw /etc/sudoers:Defaults !rootpw /etc/sudoers:Defaults !runaspw If conflicting results are returned, this is a finding. If "Defaults !targetpw" is not defined, this is a finding. If "Defaults !rootpw" is not defined, this is a finding. If "Defaults !runaspw" is not defined, this is a finding.</RawString> </Rule> <Rule id="V-237635" severity="medium" conversionstatus="pass" title="SRG-OS-000373-GPOS-00156" dscresource="nxFile"> <Contents> </Contents> <Description><VulnDiscussion>Without re-authentication, users may access resources or perform tasks for which they do not have authorization. When operating systems provide the capability to escalate a functional capability, it is critical the organization requires the user to re-authenticate when using the "sudo" command. If the value is set to an integer less than 0, the user's time stamp will not expire and the user will not have to re-authenticate for privileged actions until the user's session is terminated.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sudoers.d/237635-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>the "Defaults timestamp_timeout=[value]" must be a number that is greater than or equal to "0" </OrganizationValueTestString> <RawString>Verify the operating system requires re-authentication when using the "sudo" command to elevate privileges. $ sudo grep -ir 'timestamp_timeout' /etc/sudoers /etc/sudoers.d /etc/sudoers:Defaults timestamp_timeout=0 If conflicting results are returned, this is a finding. If "timestamp_timeout" is set to a negative number, is commented out, or no results are returned, this is a finding.</RawString> </Rule> <Rule id="V-250314" severity="medium" conversionstatus="pass" title="SRG-OS-000324-GPOS-00125" dscresource="nxFile"> <Contents>%wheel ALL=(ALL) TYPE=sysadm_t ROLE=sysadm_r ALL</Contents> <Description><VulnDiscussion>Preventing non-privileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges. Privileged functions include, for example, establishing accounts, performing system integrity checks, or administering cryptographic key management activities. Non-privileged users are individuals who do not possess appropriate authorizations. Circumventing intrusion detection and prevention mechanisms or malicious code protection mechanisms are examples of privileged functions that require protection from non-privileged users.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <FilePath>/etc/sudoers.d/250314-powerstig.conf</FilePath> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system elevates the SELinux context when an administrator calls the sudo command with the following command: This command must be ran as root: # grep -r sysadm_r /etc/sudoers /etc/sudoers.d %wheel ALL=(ALL) TYPE=sysadm_t ROLE=sysadm_r ALL If conflicting results are returned, this is a finding. If a designated sudoers administrator group or account(s) is not configured to elevate the SELinux type and role to "sysadm_t" and "sysadm_r" with the use of the sudo command, this is a finding.</RawString> </Rule> </nxFileRule> <nxPackageRule dscresourcemodule="nx"> <Rule id="V-204442" severity="high" conversionstatus="pass" title="SRG-OS-000095-GPOS-00049" dscresource="nxPackage"> <Description><VulnDiscussion>It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). The rsh-server service provides an unencrypted remote access service that does not provide for the confidentiality and integrity of user passwords or the remote session and has very weak authentication. If a privileged user were to log on using this service, the privileged user password could be compromised.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <Ensure>Absent</Ensure> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71967</LegacyId> <Name>rsh-server</Name> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Check to see if the rsh-server package is installed with the following command: # yum list installed rsh-server If the rsh-server package is installed, this is a finding.</RawString> </Rule> <Rule id="V-204443" severity="high" conversionstatus="pass" title="SRG-OS-000095-GPOS-00049" dscresource="nxPackage"> <Description><VulnDiscussion>Removing the "ypserv" package decreases the risk of the accidental (or intentional) activation of NIS or NIS+ services.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <Ensure>Absent</Ensure> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71969</LegacyId> <Name>ypserv</Name> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>The NIS service provides an unencrypted authentication service that does not provide for the confidentiality and integrity of user passwords or the remote session. Check to see if the "ypserve" package is installed with the following command: # yum list installed ypserv If the "ypserv" package is installed, this is a finding.</RawString> </Rule> <Rule id="V-204497" severity="high" conversionstatus="pass" title="SRG-OS-000033-GPOS-00014" dscresource="nxPackage"> <Description><VulnDiscussion>Use of weak or untested encryption algorithms undermines the purposes of using encryption to protect data. The operating system must implement cryptographic modules adhering to the higher standards approved by the federal government since this provides assurance they have been tested and validated. Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000185-GPOS-00079, SRG-OS-000396-GPOS-00176, SRG-OS-000405-GPOS-00184, SRG-OS-000478-GPOS-00223</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <Ensure>Present</Ensure> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72067</LegacyId> <Name>dracut-fips</Name> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system implements DoD-approved encryption to protect the confidentiality of remote access sessions. Check to see if the "dracut-fips" package is installed with the following command: # yum list installed dracut-fips dracut-fips-033-360.el7_2.x86_64.rpm If a "dracut-fips" package is installed, check to see if the kernel command line is configured to use FIPS mode with the following command: Note: GRUB 2 reads its configuration from the "/boot/grub2/grub.cfg" file on traditional BIOS-based machines and from the "/boot/efi/EFI/redhat/grub.cfg" file on UEFI machines. # grep fips /boot/grub2/grub.cfg /vmlinuz-3.8.0-0.40.el7.x86_64 root=/dev/mapper/rhel-root ro rd.md=0 rd.dm=0 rd.lvm.lv=rhel/swap crashkernel=auto rd.luks=0 vconsole.keymap=us rd.lvm.lv=rhel/root rhgb fips=1 quiet If the kernel command line is configured to use FIPS mode, check to see if the system is in FIPS mode with the following command: # cat /proc/sys/crypto/fips_enabled 1 If a "dracut-fips" package is not installed, the kernel command line does not have a fips entry, or the system has a value of "0" for "fips_enabled" in "/proc/sys/crypto", this is a finding. Verify the file /etc/system-fips exists. # ls -l /etc/system-fips If this file does not exist, this is a finding.</RawString> </Rule> <Rule id="V-204498" severity="low" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxPackage"> <Description><VulnDiscussion>ACLs can provide permissions beyond those permitted through the file mode and must be verified by file integrity tools.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <Ensure>Present</Ensure> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72069</LegacyId> <Name>aide</Name> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the file integrity tool is configured to verify ACLs. Note: AIDE is highly configurable at install time. These commands assume the "aide.conf" file is under the "/etc" directory. Use the following command to determine if the file is in another location: # find / -name aide.conf Check the "aide.conf" file to determine if the "acl" rule has been added to the rule list being applied to the files and directories selection lists. An example rule that includes the "acl" rule is below: All= p+i+n+u+g+s+m+S+sha512+acl+xattrs+selinux /bin All # apply the custom rule to the files in bin /sbin All # apply the same custom rule to the files in sbin If the "acl" rule is not being used on all uncommented selection lines in the "/etc/aide.conf" file, or ACLs are not being checked by another file integrity tool, this is a finding.</RawString> </Rule> <Rule id="V-204502" severity="high" conversionstatus="pass" title="SRG-OS-000095-GPOS-00049" dscresource="nxPackage"> <Description><VulnDiscussion>It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include, but are not limited to, games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission, but which cannot be disabled.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <Ensure>Absent</Ensure> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72077</LegacyId> <Name>telnet-server</Name> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system is configured to disable non-essential capabilities. The most secure way of ensuring a non-essential capability is disabled is to not have the capability installed. The telnet service provides an unencrypted remote access service that does not provide for the confidentiality and integrity of user passwords or the remote session. If a privileged user were to log on using this service, the privileged user password could be compromised. Check to see if the telnet-server package is installed with the following command: # yum list installed telnet-server If the telnet-server package is installed, this is a finding.</RawString> </Rule> <Rule id="V-204585" severity="medium" conversionstatus="pass" title="SRG-OS-000423-GPOS-00187" dscresource="nxPackage"> <Description><VulnDiscussion>Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read or altered. This requirement applies to both internal and external networks and all types of information system components from which information can be transmitted (e.g., servers, mobile devices, notebook computers, printers, copiers, scanners, and facsimile machines). Communication paths outside the physical protection of a controlled boundary are exposed to the possibility of interception and modification. Protecting the confidentiality and integrity of organizational information can be accomplished by physical means (e.g., employing physical distribution systems) or by logical means (e.g., employing cryptographic techniques). If physical means of protection are employed, logical means (cryptography) do not have to be employed, and vice versa. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188, SRG-OS-000425-GPOS-00189, SRG-OS-000426-GPOS-00190</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <Ensure>Present</Ensure> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72233</LegacyId> <Name>openssh-server</Name> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Check to see if sshd is installed with the following command: # yum list installed \*ssh\* libssh2.x86_64 1.4.3-8.el7 @anaconda/7.1 openssh.x86_64 6.6.1p1-11.el7 @anaconda/7.1 openssh-server.x86_64 6.6.1p1-11.el7 @anaconda/7.1 If the "SSH server" package is not installed, this is a finding.</RawString> </Rule> <Rule id="V-204604.a" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxPackage"> <Description><VulnDiscussion>Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls limit which applications are allowed to communicate over the network. Satisfies: SRG-OS-000480-GPOS-00227, SRG-OS-000480-GPOS-00231, SRG-OS-000480-GPOS-00232</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <Ensure>Present</Ensure> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72273.a</LegacyId> <Name>firewalld</Name> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system enabled an application firewall. Check to see if "firewalld" is installed with the following command: # yum list installed firewalld firewalld-0.3.9-11.el7.noarch.rpm If the "firewalld" package is not installed, ask the System Administrator if another firewall application (such as iptables) is installed. If an application firewall is not installed, this is a finding. Check to see if the firewall is loaded and active with the following command: # systemctl status firewalld firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled) Active: active (running) since Tue 2014-06-17 11:14:49 CEST; 5 days ago If "firewalld" does not show a status of "loaded" and "active", this is a finding. Check the state of the firewall: # firewall-cmd --state running If "firewalld" does not show a state of "running", this is a finding.</RawString> </Rule> <Rule id="V-204620" severity="high" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxPackage"> <Description><VulnDiscussion>The FTP service provides an unencrypted remote access that does not provide for the confidentiality and integrity of user passwords or the remote session. If a privileged user were to log on using this service, the privileged user password could be compromised. SSH or other encrypted file transfer methods must be used in place of this service.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <Ensure>Absent</Ensure> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72299</LegacyId> <Name>vsftpd</Name> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify an FTP server has not been installed on the system. Check to see if an FTP server has been installed with the following commands: # yum list installed vsftpd vsftpd-3.0.2.el7.x86_64.rpm If "vsftpd" is installed and is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.</RawString> </Rule> <Rule id="V-204621" severity="high" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxPackage"> <Description><VulnDiscussion>If TFTP is required for operational support (such as the transmission of router configurations) its use must be documented with the Information System Security Officer (ISSO), restricted to only authorized personnel, and have access control rules established.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <Ensure>Absent</Ensure> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72301</LegacyId> <Name>tftp-server</Name> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify a TFTP server has not been installed on the system. Check to see if a TFTP server has been installed with the following command: # yum list installed tftp-server tftp-server-0.49-9.el7.x86_64.rpm If TFTP is installed and the requirement for TFTP is not documented with the ISSO, this is a finding.</RawString> </Rule> <Rule id="V-204631" severity="medium" conversionstatus="pass" title="SRG-OS-000375-GPOS-00160" dscresource="nxPackage"> <Description><VulnDiscussion>Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the information system is compromised, that compromise will not affect credentials stored on the authentication device. Multifactor solutions that require devices separate from information systems gaining access include, for example, hardware tokens providing time-based or challenge-response authenticators and smart cards such as the U.S. Government Personal Identity Verification card and the DoD Common Access Card. A privileged account is defined as an information system account with authorizations of a privileged user. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. This requirement only applies to components where this is specific to the function of the device or has the concept of an organizational user (e.g., VPN, proxy capability). This does not apply to authentication for the purpose of configuring the device itself (management). Satisfies: SRG-OS-000375-GPOS-00160, SRG-OS-000375-GPOS-00161, SRG-OS-000375-GPOS-00162</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <Ensure>Present</Ensure> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72417</LegacyId> <Name>pam_pkcs11</Name> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system has the packages required for multifactor authentication installed. Check for the presence of the packages required to support multifactor authentication with the following commands: # yum list installed pam_pkcs11 pam_pkcs11-0.6.2-14.el7.noarch.rpm If the "pam_pkcs11" package is not installed, this is a finding.</RawString> </Rule> <Rule id="V-255926" severity="medium" conversionstatus="pass" title="SRG-OS-000029-GPOS-00010" dscresource="nxPackage"> <Description><VulnDiscussion>A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock. The screen and tmux packages allow for a session lock to be implemented and configured.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <Ensure>Present</Ensure> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId> </LegacyId> <Name> </Name> <OrganizationValueRequired>True</OrganizationValueRequired> <OrganizationValueTestString>Specify either tmux or screen depending on preference</OrganizationValueTestString> <RawString>Verify the operating system has the screen package installed. Check to see if the screen package is installed with the following command: # yum list installed screen screen-4.3.1-3-x86_64.rpm If the screen package is not installed, check to see if the tmux package is installed with the following command: # yum list installed tmux tmux-1.8-4.el7.x86_64.rpm If either the screen package or the tmux package is not installed, this is a finding.</RawString> </Rule> </nxPackageRule> <nxServiceRule dscresourcemodule="nx"> <Rule id="V-204451" severity="medium" conversionstatus="pass" title="SRG-OS-000114-GPOS-00059" dscresource="nxService"> <Description><VulnDiscussion>Automatically mounting file systems permits easy introduction of unknown devices, thereby facilitating malicious activity. Satisfies: SRG-OS-000114-GPOS-00059, SRG-OS-000378-GPOS-00163, SRG-OS-000480-GPOS-00227</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <Enabled>False</Enabled> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-71985</LegacyId> <Name>autofs</Name> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system disables the ability to automount devices. Check to see if automounter service is active with the following command: # systemctl status autofs autofs.service - Automounts filesystems on demand Loaded: loaded (/usr/lib/systemd/system/autofs.service; disabled) Active: inactive (dead) If the "autofs" status is set to "active" and is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.</RawString> <State /> </Rule> <Rule id="V-204492" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxService"> <Description><VulnDiscussion>Kernel core dumps may contain the full contents of system memory at the time of the crash. Kernel core dumps may consume a considerable amount of disk space and may result in denial of service by exhausting the available space on the target file system partition.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <Enabled>False</Enabled> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72057</LegacyId> <Name>kdump</Name> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify that kernel core dumps are disabled unless needed. Check the status of the "kdump" service with the following command: # systemctl status kdump.service kdump.service - Crash recovery kernel arming Loaded: loaded (/usr/lib/systemd/system/kdump.service; enabled) Active: active (exited) since Wed 2015-08-26 13:08:09 EDT; 43min ago Main PID: 1130 (code=exited, status=0/SUCCESS) kernel arming. If the "kdump" service is active, ask the System Administrator if the use of the service is required and documented with the Information System Security Officer (ISSO). If the service is active and is not documented, this is a finding.</RawString> <State /> </Rule> <Rule id="V-204503" severity="medium" conversionstatus="pass" title="SRG-OS-000038-GPOS-00016" dscresource="nxService"> <Description><VulnDiscussion>Without establishing what type of events occurred, it would be difficult to establish, correlate, and investigate the events leading up to an outage or attack. Audit record content that may be necessary to satisfy this requirement includes, for example, time stamps, source and destination addresses, user/process identifiers, event descriptions, success/fail indications, filenames involved, and access control or flow control rules invoked. Associating event types with detected events in the operating system audit logs provides a means of investigating an attack; recognizing resource utilization or capacity thresholds; or identifying an improperly configured operating system. Satisfies: SRG-OS-000038-GPOS-00016, SRG-OS-000039-GPOS-00017, SRG-OS-000042-GPOS-00021, SRG-OS-000254-GPOS-00095, SRG-OS-000255-GPOS-00096</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <Enabled>True</Enabled> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72079</LegacyId> <Name>auditd</Name> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system produces audit records containing information to establish when (date and time) the events occurred. Check to see if auditing is active by issuing the following command: # systemctl is-active auditd.service active If the "auditd" status is not active, this is a finding.</RawString> <State>Running</State> </Rule> <Rule id="V-204586" severity="medium" conversionstatus="pass" title="SRG-OS-000423-GPOS-00187" dscresource="nxService"> <Description><VulnDiscussion>Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read or altered. This requirement applies to both internal and external networks and all types of information system components from which information can be transmitted (e.g., servers, mobile devices, notebook computers, printers, copiers, scanners, and facsimile machines). Communication paths outside the physical protection of a controlled boundary are exposed to the possibility of interception and modification. Protecting the confidentiality and integrity of organizational information can be accomplished by physical means (e.g., employing physical distribution systems) or by logical means (e.g., employing cryptographic techniques). If physical means of protection are employed, then logical means (cryptography) do not have to be employed, and vice versa. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188, SRG-OS-000425-GPOS-00189, SRG-OS-000426-GPOS-00190</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <Enabled>True</Enabled> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72235</LegacyId> <Name>sshd</Name> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify SSH is loaded and active with the following command: # systemctl status sshd sshd.service - OpenSSH server daemon Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled) Active: active (running) since Tue 2015-11-17 15:17:22 EST; 4 weeks 0 days ago Main PID: 1348 (sshd) CGroup: /system.slice/sshd.service 1053 /usr/sbin/sshd -D If "sshd" does not show a status of "active" and "running", this is a finding.</RawString> <State>Running</State> </Rule> <Rule id="V-204604.b" severity="medium" conversionstatus="pass" title="SRG-OS-000480-GPOS-00227" dscresource="nxService"> <Description><VulnDiscussion>Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls limit which applications are allowed to communicate over the network. Satisfies: SRG-OS-000480-GPOS-00227, SRG-OS-000480-GPOS-00231, SRG-OS-000480-GPOS-00232</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls></Description> <DuplicateOf /> <Enabled>True</Enabled> <IsNullOrEmpty>False</IsNullOrEmpty> <LegacyId>V-72273.b</LegacyId> <Name>firewalld</Name> <OrganizationValueRequired>False</OrganizationValueRequired> <OrganizationValueTestString /> <RawString>Verify the operating system enabled an application firewall. Check to see if "firewalld" is installed with the following command: # yum list installed firewalld firewalld-0.3.9-11.el7.noarch.rpm If the "firewalld" package is not installed, ask the System Administrator if another firewall application (such as iptables) is installed. If an application firewall is not installed, this is a finding. Check to see if the firewall is loaded and active with the following command: # systemctl status firewalld firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled) Active: active (running) since Tue 2014-06-17 11:14:49 CEST; 5 days ago If "firewalld" does not show a status of "loaded" and "active", this is a finding. Check the state of the firewall: # firewall-cmd --state running If "firewalld" does not show a state of "running", this is a finding.</RawString> <State>Running</State> </Rule> </nxServiceRule> </DISASTIG> |