SV-260569r1101736: Ubuntu 22.04 LTS must store only encrypted representations of passwords. | Canonical Ubuntu 22.04 LTS STIG SCAP Benchmark

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Assessment Title

Rule Text

Ubuntu 22.04 LTS must store only encrypted representations of passwords.

Description

Discussion Text

Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. If the information system or application allows the user to consecutively reuse their password when that password has exceeded its defined lifetime, the end result is a password that is not changed as per policy requirements.

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

IA Controls

NIST SP 800-53

Not mappedCCI-004062Not mappedCCI-000196

References

DPMS Target Canonical Ubuntu 22.04 LTS DISA DPMS Target Canonical Ubuntu 22.04 LTS 5594

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.ubuntu2204os:def:260569
# Ubuntu 22.04 LTS must store only encrypted representations of passwords.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# /etc/pam.d/common-password:password includes pam_unix.so sha512
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -Pq '^\s*password\s+.*pam_unix\.so\s*.*sha512\s*.*$' '/etc/pam.d/common-password' &>/dev/null
}
# /etc/pam.d/common-password:password includes pam_unix.so rounds greater than or equals to 100000
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  [ "$(sed -En 's/^\s*password\s+.*pam_unix\.so\s*.*rounds=(\d+)(?:#.*)?$/\1/p' '/etc/pam.d/common-password')" -ge 100000 ]
}

if ( test_1 && test_2 ); 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.ubuntu2204os:def:260569
if [ ! -f "/etc/pam.d/common-password" ]; then echo "PASS"; exit 0; fi; grep -q "^\\s*password\\s+.*pam_unix\\.so\\s*.*sha512\\s*.*$" /etc/pam.d/common-password || echo "FAIL"; exit 0; if ! grep -q "^\\s*password\\s+.*pam_unix\\.so\\s*.*rounds=(\\d+)" /etc/pam.d/common-password; then echo "PASS"; exit 0; fi; awk '{match($0, /^\\s*password\\s+.*pam_unix\\.so\\s*.*rounds=(\\d+)/, arr)} END {if (arr[1]+0 >= 100000) {print "PASS"} else {print "FAIL"}}' /etc/pam.d/common-password | grep -q "PASS" || echo "FAIL"; exit 0

Remediation

Configure Ubuntu 22.04 LTS to store encrypted representations of passwords. 
 
Add or modify the following line in the "/etc/pam.d/common-password" file: 
 
password [success=1 default=ignore] pam_unix.so obscure sha512 shadow rounds=100000