Title

The audit system must be configured to audit modifications to the systems Mandatory Access Control (MAC) configuration (SELinux). (Cat III impact)

Discussion

The system's mandatory access policy (SELinux) should not be arbitrarily changed by anything other than administrator action. All changes to MAC policy should be audited.

Check Content

To determine if the system is configured to audit changes to its SELinux configuration files, run the following command: $ sudo grep -w "/etc/selinux" /etc/audit/audit.rules If the system is configured to watch for changes to its SELinux configuration, a line should be returned (including "-p wa" indicating permissions that are watched). If the system is not configured to audit attempts to change the MAC policy, this is a finding.

Fix Text

Add the following to "/etc/audit/audit.rules": -w /etc/selinux/ -p wa -k MAC-policy

Additional Identifiers

Rule ID: SV-217961r603264_rule

Vulnerability ID: V-217961

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.