SV-258015r1045086: RHEL 9 must prevent a user from overriding the disabling of the graphical user interface automount function. | Red Hat Enterprise Linux 9 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 9 must prevent a user from overriding the disabling of the graphical user interface automount function.

Description

Discussion Text

A nonprivileged account is any operating system account with authorizations of a nonprivileged user. 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:258015
# RHEL 9 must prevent a user from overriding the disabling of the graphical user interface automount function.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -Pq '^\s*system-db\s*:\s*local\s*$' '/etc/dconf/profile/user' &>/dev/null
}
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -rqP --include='*' '^/org/gnome/desktop/media-handling/automount-open$' '/etc/dconf/db/local.d/locks' &>/dev/null
}

if ( test_1 && test_2 ); 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.stig.rhel9os:def:258015

if [ -f /etc/dconf/db/local.d/locks/00-security-settings-lock ]; then
    if grep -q '^/org/gnome/desktop/media-handling/automount-open$' /etc/dconf/db/local.d/locks/00-security-settings-lock; then
        echo "PASS"
        exit 0
    else
        echo "FAIL"
        exit 1
    fi
else
    echo "FAIL"
    exit 1
fi

Remediation

Configure the GNOME desktop to not allow a user to change the setting that disables automated mounting of removable media.

Add the following line to "/etc/dconf/db/local.d/locks/00-security-settings-lock" to prevent user modification:

/org/gnome/desktop/media-handling/automount-open

Then update the dconf system databases:

$ sudo dconf update