SV-274186r1120546: Amazon Linux 2023 must configure the use of the pam_faillock.so module in the /etc/pam.d/system-auth file. | Amazon Linux 2023 STIG SCAP Benchmark

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Assessment Title

Rule Text

Amazon Linux 2023 must configure the use of the pam_faillock.so module in the /etc/pam.d/system-auth file.

Description

Discussion Text

If the pam_faillock.so module is not loaded, the system will not correctly lockout accounts to prevent password guessing attacks.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000044

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.

#!/bin/bash
# Reconstructed from oval:mil.disa.stig.amzlx23os:def:274186
# Amazon Linux 2023 must configure the use of the pam_faillock.so module in the /etc/pam.d/system-auth file.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# pam_faillock.so present in system-auth
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -Pq '^[\s]*auth[\s]+.*pam_faillock\.so.*preauth[^\n]*\n([\s\S]*)^[\s]*auth[\s]+.*pam_unix\.so' '/etc/pam.d/system-auth' &>/dev/null
}

if test_1; then
  echo "PASS"
else
  echo "FAIL"
fi

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:274186

FILE="/etc/pam.d/system-auth"
if [ ! -f "$FILE" ]; then
  echo "PASS"
  exit 0
fi

if [ $(grep -P '^[\s]*auth[\s]+.*pam_faillock\\.so.*preauth[^\\n]*\\n' "$FILE" | grep -c .) -ge 1 ] && \
   grep -q '^[\s]*auth[\s]+.*pam_unix\\.so' "$FILE"; then
  echo "PASS"
  exit 0
fi

echo "FAIL"
exit 1

Remediation

Configure Amazon Linux 2023 to include the use of the pam_faillock.so module in the /etc/pam.d/system-auth file.

Add/modify the appropriate sections of the "/etc/pam.d/system-auth" file to match the following lines:
Note: The "preauth" line must be listed before pam_unix.so.

auth required pam_faillock.so preauth
auth required pam_faillock.so authfail
account required pam_faillock.so