SV-37334r1: The /etc/nsswitch.conf file must not have an extended ACL. | Red Hat Enterprise Linux 5 Security Technical Implementation Guide

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Assessment Title

Rule Text

The /etc/nsswitch.conf file must not have an extended ACL.

Description

Discussion Text

The nsswitch.conf file (or equivalent) configures the source of a variety of system security information including account, group, and host lookups. Malicious changes could prevent the system from functioning or compromise system security.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000225

Additional Details

Responsibility

System Administrator

IA Controls

ECLP-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:512
# The /etc/nsswitch.conf file must not have an extended ACL.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# The /etc/nsswitch.conf file must not have an extended ACL.
# file_object (file_test)
test_1() {
  (stat -c '%A' '/etc/nsswitch.conf' | awk '{print (index($0,"+")>0)?"true":"false"}') | grep -qxF 'true'
}

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.fso.rhel11:def:512
if [ ! -f "/etc/nsswitch.conf" ]; then echo "PASS"; exit 0; fi; if [ -x "$(getfacl -b /etc/nsswitch.conf 2>/dev/null | grep -oP '(?<=^# ACL:\s)\S+')" ]; then echo "FAIL"; exit 1; else echo "PASS"; exit 0; fi

Remediation

Remove the extended ACL from the file.
# setfacl --remove-all /etc/nsswitch.conf