SV-258045r958482: RHEL 9 duplicate User IDs (UIDs) must not exist for interactive users. | Red Hat Enterprise Linux 9 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 9 duplicate User IDs (UIDs) must not exist for interactive users.

Description

Discussion Text

To ensure accountability and prevent unauthenticated access, interactive users must be identified and authenticated to prevent potential misuse and compromise of the system. Satisfies: SRG-OS-000104-GPOS-00051, SRG-OS-000121-GPOS-00062, SRG-OS-000042-GPOS-00020

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

IA Controls

NIST SP 800-53

Not mappedCCI-000135Not mappedCCI-000764Not mappedCCI-000804

References

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

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:258045

if [ ! -f "/etc/passwd" ]; then
  echo "PASS"
  exit 0
fi

declare -a users
while IFS=: read -r _ name uid _ _ _ _ _ _; do
  users+=("$name")
done < /etc/passwd

for user in "${users[@]}"; do
  uids=$(cut -d: -f3 /etc/passwd | grep -o "$user" | wc -l)
  if [ $uids -gt 1 ]; then
    echo "FAIL"
    exit 1
  fi
done

echo "PASS"
exit 0

Remediation

Edit the file "/etc/passwd" and provide each interactive user account that has a duplicate UID with a unique UID.