← Back to Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide

V-282434

CAT II (Medium)

TOSS 5 audit system must protect login user identifiers (UIDs) from unauthorized change.

Rule ID

SV-282434r1200282_rule

STIG

Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-000162 CCI-000163 CCI-000164 CCI-000172

Discussion

If modification of login UIDs is not prevented, they can be changed by nonprivileged users and make auditing complicated or impossible. Satisfies: SRG-OS-000057-GPOS-00027, SRG-OS-000058-GPOS-00028, SRG-OS-000059-GPOS-00029, SRG-OS-000462-GPOS-00206, SRG-OS-000475-GPOS-00220

Check Content

Verify the audit system prevents unauthorized changes to login UIDs using the following command:

$ sudo grep -i 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

Configure TOSS 5 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

Restart the audit daemon for the changes to take effect.