SV-258061r958482: RHEL 9 groups must have unique Group ID (GID). | Red Hat Enterprise Linux 9 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 9 groups must have unique Group ID (GID).

Description

Discussion Text

To ensure accountability and prevent unauthenticated access, groups must be identified uniquely to prevent potential misuse and compromise of the system.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000764

References

DPMS Target Red Hat Enterprise Linux 9 DISA DPMS Target Red Hat Enterprise Linux 9 5551

Checks

DISA STIG (Manual Reference)

Verify that RHEL 9 contains no duplicate GIDs for interactive users with the following command:
 
 $  cut -d : -f 3 /etc/group | uniq -d
 
If the system has duplicate GIDs, this is a finding.

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

Assessment Script Powered by AISandbox-executed

A standalone Shell script to assess this control automatically. Review before running it in your environment.

Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.

#!/bin/sh
# OVAL definition: oval:mil.disa.stig.rhel9os:def:258061
if [ ! -f "/etc/group" ]; then echo "PASS"; exit 0; fi
awk -F: '{print $3}' /etc/group | sort | uniq -d | wc -l | grep -q '^[0-9]$'; if [ $? -eq 0 ]; then echo "PASS"; else echo "FAIL"; fi; exit ${?}

Remediation

Edit the file "/etc/group" and provide each group that has a duplicate GID with a unique GID.