SV-37860r1: The "nosuid" option must be enabled on all Network File System (NFS) client mounts. | Red Hat Enterprise Linux 5 Security Technical Implementation Guide

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Assessment Title

Rule Text

The "nosuid" option must be enabled on all Network File System (NFS) client mounts.

Description

Discussion Text

Enabling the nosuid mount option prevents the system from granting owner or group-owner privileges to programs with the suid or sgid bit set. If the system does not restrict this access, users with unprivileged access to the local system may be able to acquire privileged access by executing suid or sgid files located on the mounted NFS file system.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000225CCE-4024-6

Additional Details

Responsibility

Information Assurance Manager

IA Controls

ECPA-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:374
# The "nosuid" option must be enabled on all Network File System (NFS) client mounts.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# NFS client mounts must have nosuid enabled
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  (sed -En 's/^[^ 	]+[ 	]+[^ 	]+[ 	]+nfs[ 	]+([^ 	]+)[ 	]+/\1/p' '/proc/mounts') | grep -Pq 'nosuid'
}

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:mil.disa.fso.rhel11:def:374

if [ ! -f "/proc/mounts" ]; then
  echo "PASS"
  exit 0
fi

awk '/^$/ {next} /nfs/ && ! /nosuid/ {print "FAIL"; exit 1}' /proc/mounts
echo "PASS"
exit 0

Remediation

Edit "/etc/fstab" and add the "nosuid" option for all NFS file systems. Remount the NFS file systems to make the change take effect.