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

The Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide (V1 R2) has 391 STIG checks. New to STIG checklists? Read What is a STIG checklist?, CKL vs CKLB, and STIG vs SCAP benchmark.

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Severity

Version

V1 · R2

CurrentPublished Wed Sep 30 2026

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

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

Assessment Title

Rule Text

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

Description

Discussion Text

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

New to STIG checklists? Read What is a STIG checklist? and CKL vs CKLB.

Objective

V-282434

Rule

SV-282434r1200282_rule

Severity

medium

Rule Version

TOSS-05-000463

Documentable

false

IA Controls

NIST SP 800-53

Rev 5

Assessment Procedure

Check Text

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.

Implementation Procedure

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.

STIG check 82 of 391 in the Tri-Lab Operating System Stack (TOSS) 5 STIG checklist

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