SV-274160r1120663: Amazon Linux 2023 must ensure all interactive users have unique User IDs (UIDs). | Amazon Linux 2023 STIG SCAP Benchmark

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Assessment Title

Rule Text

Amazon Linux 2023 must ensure all interactive users have unique User IDs (UIDs).

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-000764Not mappedCCI-000804Not mappedCCI-000135

References

DPMS Target Amazon Linux 2023 DISA DPMS Target Amazon Linux 2023 5700

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.amzlx23os:def:274160

declare -a uids=()
declare -a passwd_lines

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

passwd_lines=$(cat /etc/passwd)

for line in $passwd_lines; do
  IFS=: read -r -a fields <<< "$line"
  uids+=("${fields[2]}")
done

# Check for duplicate UIDs
seen=()
for uid in "${uids[@]}"; do
  if [[ " ${seen[*]} " =~ " ${uid} " ]]; then
    echo "FAIL"
    exit 1
  fi
  seen+=("$uid")
done

echo "PASS"
exit 0

Remediation

Configure Amazon Linux 2023 to contain no duplicate UIDs for interactive users.

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