SV-37849r1: All Network File System (NFS) exported system files and system directories must be owned by root. | Red Hat Enterprise Linux 5 Security Technical Implementation Guide

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Assessment Title

Rule Text

All Network File System (NFS) exported system files and system directories must be owned by root.

Description

Discussion Text

Failure to give ownership of sensitive files or directories to root provides the designated owner and possible unauthorized users with the potential to access sensitive information or 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

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:369
# All Network File System (NFS) exported system files and system directories must be owned by root.
# 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) -- exports owned by root: no extractor for field "user_id"

# No exports specified in /etc/exports
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  ! ( grep -Pq '^[ \t]*([^# \t]+)[ \t]' '/etc/exports' &>/dev/null )
}

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:369

if [ ! -f "/etc/exports" ]; then
  echo "PASS"
  exit 0
fi

export_lines=$(grep -v '^#' /etc/exports | grep -v '^$')

if [ -z "$export_lines" ]; then
  echo "PASS"
  exit 0
fi

for line in $export_lines; do
  path=$(echo "$line" | awk '{print $1}')
  if [ ! -d "$path" ]; then
    continue
  fi

  uid=$(stat -c "%u" "$path")
  if [ "$uid" -ne 0 ]; then
    echo "FAIL"
    exit 1
  fi
done

echo "PASS"
exit 0

Remediation

Change the ownership of exported file systems not owned by root.

Procedure:
# chown root <path>