AlmaLinux OS 9 audit system must protect logon UIDs from unauthorized change.

STIG ID: ALMA-09-056780 |  SRG: SRG-OS-000058-GPOS-00028 |  Severity: medium |  CCI:  | Vulnerability Id: V-269544

Vulnerability Discussion

If modification of login user identifiers (UIDs) is not prevented, they can be changed by nonprivileged users and make auditing complicated or impossible.

Check

Configure AlmaLinux OS 9 auditing to prevent modification of login UIDs once they are set by adding the following line to /etc/audit/rules.d/audit.rules:

--loginuid-immutable

Fix

Verify the audit system prevents unauthorized changes to logon UIDs with the following command:

$ grep immutable /etc/audit/audit.rules

--loginuid-immutable

If the "--loginuid-immutable" option is not returned in the "/etc/audit/audit.rules", or the line is commented out, this is a finding.