SV-258014r1045084: RHEL 9 must disable the graphical user interface automount function unless required. | Red Hat Enterprise Linux 9 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 9 must disable the graphical user interface automount function unless required.

Description

Discussion Text

Automatically mounting file systems permits easy introduction of unknown devices, thereby facilitating malicious activity. Satisfies: SRG-OS-000114-GPOS-00059, SRG-OS-000378-GPOS-00163, SRG-OS-000480-GPOS-00227

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

IA Controls

NIST SP 800-53

Not mappedCCI-000778Not mappedCCI-001958

References

DPMS Target Red Hat Enterprise Linux 9 DISA DPMS Target Red Hat Enterprise Linux 9 5551

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.stig.rhel9os:def:258014
# RHEL 9 must disable the graphical user interface automount function unless required.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# The operating system disables the GUI automount feature.
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  (sed -En 's/^\s*\[org\\/gnome\\/desktop\\/media-handling]\s*\n+[^\[]*automount-open\s*=\s*(\w+)$/\1/p' '/etc/dconf/db/local.d/00-security-settings') | grep -qxF 'false'
}

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.stig.rhel9os:def:258014

FILE="/etc/dconf/db/local.d/00-security-settings"
if [ ! -f "$FILE" ]; then
  echo "PASS"
  exit 0
fi

if grep -q "^\\s*\\[org\\/gnome\\/desktop\\/media-handling]\\s*\\n+[^\\[]*automount-open\\s*=\\s*false$" "$FILE"; then
  echo "PASS"
  exit 0
else
  echo "FAIL"
  exit 1
fi

Remediation

Configure the GNOME desktop to disable automated mounting of removable media.

The dconf settings can be edited in the /etc/dconf/db/* location.

Update the [org/gnome/desktop/media-handling] section of the "/etc/dconf/db/local.d/00-security-settings" database file and add or update the following lines:

[org/gnome/desktop/media-handling]
automount-open=false

Then update the dconf system databases:

$ sudo dconf update