SV-37857r1: The Network File System (NFS) server must be configured to restrict file system access to local hosts. | Red Hat Enterprise Linux 5 Security Technical Implementation Guide

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Assessment Title

Rule Text

The Network File System (NFS) server must be configured to restrict file system access to local hosts.

Description

Discussion Text

The NFS access option limits user access to the specified level. This assists in protecting exported file systems. If access is not restricted, unauthorized hosts may be able to access the system's NFS exports.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366

Additional Details

Responsibility

System Administrator

IA Controls

ECSC-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:372
# The Network File System (NFS) server must be configured to restrict file system access to local hosts.
# 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:
#   - variable_object (variable_test) -- all entries with a 'ro' or 'rw' in the specified options: no extractor for field "value"

# No entries exist in /etc/exports
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  ! ( grep -Pq '^\s*([^\n#]+)' '/etc/exports' &>/dev/null )
}
# all export lines have an option set defined
# textfilecontent54_object (textfilecontent54_test)
test_3() {
  (sed -En 's/^\s*([^\n#]+)/\1/p' '/etc/exports') | grep -Pq '.*\(.*'
}

if ! ( test_1 || ! test_3 ); 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:372

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

export_entries=$(cat /etc/exports)

if [[ $export_entries =~ ^[^\n#]*\(.*\) ]]; then
  for entry in $export_entries; do
    if [[ $entry =~ ^[^\s#\*\?\n]+\((r[ow],\S+)?\) ]]; then
      echo "PASS"
      exit 0
    fi
  done
fi

echo "FAIL"
exit 1

Remediation

Edit /etc/exports and add ro and/or rw options (as appropriate) specifying a list of hosts or networks which are permitted access. Re-export the file systems.