AlmaLinux OS 9 audit system must protect logon UIDs from unauthorized change.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-269544 | ALMA-09-056780 | SV-269544r1050427_rule | CCI-000163 | medium |
| Description | ||||
| If modification of login user identifiers (UIDs) is not prevented, they can be changed by nonprivileged users and make auditing complicated or impossible. | ||||
| STIG | Date | |||
| CloudLinux AlmaLinux OS 9 Security Technical Implementation Guide | 2025-05-22 | |||
Details
Check Text (C-269544r1050427_chk)
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.
Fix Text (F-73476r1049960_fix)
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