SV-274163r1261421: Amazon Linux 2023 system-auth must be configured to use a sufficient number of hashing rounds. | Amazon Linux 2023 STIG SCAP Benchmark

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Assessment Title

Rule Text

Amazon Linux 2023 system-auth must be configured to use a sufficient number of hashing rounds.

Description

Discussion Text

Unapproved mechanisms used for authentication to the cryptographic module are not verified and therefore, cannot be relied upon to provide confidentiality or integrity, and DoW data may be compromised. Operating systems utilizing encryption are required to use FIPS-compliant mechanisms for authenticating to cryptographic modules. FIPS 140-2/140-3 is the current standard for validating that mechanisms used to access cryptographic modules utilize authentication that meets DoW requirements. This allows for Security Levels 1, 2, 3, or 4 for use on a general purpose computing system. Satisfies: SRG-OS-000073-GPOS-00041, SRG-OS-000120-GPOS-00061

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

IA Controls

NIST SP 800-53

Not mappedCCI-004062Not mappedCCI-000803

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:274163
# Amazon Linux 2023 system-auth must be configured to use a sufficient number of hashing rounds.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# The pam_unix module is included in system-auth and configured for 100000 or more rounds.
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  [ "$(sed -En 's/^\s*password\s+sufficient\s+pam_unix\.so\s+[^#\n]*\brounds=(\d+)\b/\1/p' '/etc/pam.d/system-auth')" -ge 100000 ]
}

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.ind:tst:25810000
if [ ! -f "/etc/pam.d/system-auth" ]; then echo "PASS"; exit 0; fi
if ! grep -q '^\\s*password\\s+sufficient\\s+pam_unix\\.so\\s+[^#\\n]*\\brounds=100000\\b' /etc/pam.d/system-auth; then echo "FAIL"; exit 1; fi
echo "PASS"; exit 0

Remediation

Configure Amazon Linux 2023 to use 100000 hashing rounds for hashing passwords.

Add or modify the following line in "/etc/pam.d/system-auth" and set "rounds" to "100000".

password sufficient pam_unix.so sha512 rounds=100000