SV-37947r1: The Network File System (NFS) exports configuration 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 Network File System (NFS) exports configuration file must not have an extended ACL.

Description

Discussion Text

File system extended ACLs provide access to files beyond what is allowed by the mode numbers of the files. Excessive permissions on the NFS export configuration file could allow unauthorized modification of the file, which could result in Denial of Service to authorized NFS exports and the creation of additional unauthorized exports.

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:559
# The Network File System (NFS) exports configuration 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/exports file must not have an ACL.
# file_object (file_test)
test_1() {
  (stat -c '%A' '/etc/exports' | 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:559
if [ ! -f "/etc/exports" ]; then echo "PASS"; exit 0; fi
if [ -f "/etc/exports" ] && [ -n "$(stat -c '%a' /etc/exports | grep -oE '1[0-7]')" ]; then echo "FAIL"; exit 1; fi
echo "PASS"; exit 0

Remediation

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