SV-37233r1: System log files must not have extended ACLs, except as needed to support authorized software. | Red Hat Enterprise Linux 5 Security Technical Implementation Guide

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Assessment Title

Rule Text

System log files must not have extended ACLs, except as needed to support authorized software.

Description

Discussion Text

If the system log files are not protected, unauthorized users could change the logged data, eliminating its forensic value. Authorized software may be given log file access through the use of extended ACLs when needed and configured to provide the least privileges required.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001314

Additional Details

Responsibility

System Administrator

IA Controls

ECLP-1, ECTP-1

References

DPMS Target Red Hat 5 DISA DPMS Target Red Hat 5 2154

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.fso.rhel11:def:520
# System log files must not have extended ACLs, except as needed to support authorized software.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.
#
# MANUAL REVIEW REQUIRED -- the module(s) below could not be reconstructed
# into working code from curated SCC reference data, and are excluded from
# the automated result:
#   - file_object (file_test) -- Make sure no file has an ACL under /var/log: no extractor for field "has_extended_acl"

# Make sure no directory has an ACL under /var/log
# file_object (file_test)
test_2() {
  (stat -c '%A' '/var/log' | awk '{print (index($0,"+")>0)?"true":"false"}') | grep -qxF 'true'
}

if test_2; then
  echo "PASS (automated portion only -- MANUAL REVIEW still required, see notes above)"
else
  echo "FAIL (or see MANUAL REVIEW note above)"
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.fso.rhel11:def:520
if [ ! -d "/var/log" ]; then echo "PASS"; exit 0; fi
for file in /var/log/*; do if [ -f "$file" ] && [ "$(stat -c "%A" "$file" | grep -o 'a' | wc -l)" -gt 0 ]; then echo "FAIL"; exit 1; fi; done
for dir in /var/log/*; do if [ -d "$dir" ] && [ "$(stat -c "%A" "$dir" | grep -o 'a' | wc -l)" -gt 0 ]; then echo "FAIL"; exit 1; fi; done
echo "PASS"; exit 0

Remediation

Remove the extended ACL from the file.

Procedure:
# setfacl --remove-all [file with extended ACL]