SV-252972r958368: TOSS must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/shadow. | Tri-Lab Operating System Stack (TOSS) 4 STIG SCAP Benchmark

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Assessment Title

Rule Text

TOSS must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/shadow.

Description

Discussion Text

Once an attacker establishes access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to modify an existing account. Auditing account modification actions provides logging that can be used for forensic purposes. To address access requirements, many operating systems can be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements. Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000303-GPOS-00120, SRG-OS-000466-GPOS-00210, SRG-OS-000476-GPOS-00221

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

IA Controls

NIST SP 800-53

Not mappedCCI-000018Not mappedCCI-000172Not mappedCCI-001403Not mappedCCI-001404Not mappedCCI-001405Not mappedCCI-002130

References

DPMS Target TOSS 4 DISA DPMS Target TOSS 4 5469

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.toss4os:def:252972
# TOSS must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/shadow.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Events resulting in modifications to /etc/shadow are audited
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -Pq '^\s*-w\s+/etc/shadow(\s+-p\s*([rx]*w[rx]*a[rx]*|[rx]*a[rx]*w[rx]*))?(\s+(-k\s+|-F\s+key=)\w+)?\s*$' '/etc/audit/audit.rules' &>/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.toss4os:def:252972
if grep -q "^\\s*-w\\s+/etc/shadow(\\s+-p\\s*([rx]*w[rx]*a[rx]*|[rx]*a[rx]*w[rx]*))?(\\s+(-k\\s+|-F\\s+key=)\\w+)?\\s*$" /etc/audit/rules.d/audit.rules; then echo "PASS"; exit 0; else echo "FAIL"; exit 1; fi

Remediation

Configure TOSS to generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/shadow."

Add or update the following file system rule to "/etc/audit/rules.d/audit.rules":

-w /etc/shadow -p wa -k identity

The audit daemon must be restarted for the changes to take effect.

Note: The "-k" allows for specifying an arbitrary identifier. The string following "-k" does not need to match the example output above.