SV-37940r1: The Network File System (NFS) export configuration file must be group-owned by root, bin, sys, or system. | Red Hat Enterprise Linux 5 Security Technical Implementation Guide

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Assessment Title

Rule Text

The Network File System (NFS) export configuration file must be group-owned by root, bin, sys, or system.

Description

Discussion Text

Failure to give group-ownership of the NFS export configuration file to root or a system group provides the designated group-owner and possible unauthorized users with the potential to change system configuration which could weaken the system's security posture.

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:367
# The Network File System (NFS) export configuration file must be group-owned by root, bin, sys, or system.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Test group of /etc/exports is root
# file_object (file_test)
test_1() {
  [ "$(stat -c '%g' '/etc/exports')" -eq 0 ]
}
# Test group of /etc/exports is bin
# file_object (file_test)
test_2() {
  [ "$(stat -c '%g' '/etc/exports')" -eq 1 ]
}
# Test group of /etc/exports is sys
# file_object (file_test)
test_3() {
  [ "$(stat -c '%g' '/etc/exports')" -eq 3 ]
}

if ( test_1 || test_2 || test_3 ); 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:367
if [ ! -f /etc/exports ]; then echo "PASS"; exit 0; fi
if [ $(stat -c "%G" /etc/exports) = "root" ] || [ $(stat -c "%G" /etc/exports) = "bin" ] || [ $(stat -c "%G" /etc/exports) = "sys" ]; then echo "PASS"; exit 0; else echo "FAIL"; exit 1; fi

Remediation

Change the group ownership of the NFS export configuration file.

Procedure:
# chgrp root /etc/exports