Title

SLEM 5 must audit all uses of the sudoers file and all files in the "/etc/sudoers.d/" directory. (Cat II impact)

Discussion

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.

Check Content

Verify SLEM 5 generates audit records when successful/unsuccessful attempts to access the "/etc/sudoers" file and files in the "/etc/sudoers.d/" directory with the following command: > sudo auditctl -l | grep -w '/etc/sudoers' -w /etc/sudoers -p wa -k privileged-actions -w /etc/sudoers.d -p wa -k privileged-actions If the commands do not return output that match the examples, this is a finding. Notes: The "-k" allows for specifying an arbitrary identifier. The string following "-k" does not need to match the example output above.

Fix Text

Configure SLEM 5 to generate audit records when successful/unsuccessful attempts to access the "/etc/sudoers" file and files in the "/etc/sudoers.d/" directory. Add or modify the following lines in "/etc/audit/rules.d/audit.rules" file: -w /etc/sudoers -p wa -k privileged-actions -w /etc/sudoers.d -p wa -k privileged-actions To reload the rules file, restart the audit daemon: > sudo systemctl restart auditd.service or issue the following command: > sudo augenrules --load

Additional Identifiers

Rule ID: SV-261465r996802_rule

Vulnerability ID: V-261465

Group Title: SRG-OS-000037-GPOS-00015

Expert Comments

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