SV-281285r1197249: RHEL 10 must prevent a user from overriding the Ctrl-Alt-Del sequence settings for the graphical user interface. | Red Hat Enterprise Linux 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 10 must prevent a user from overriding the Ctrl-Alt-Del sequence settings for the graphical user interface.

Description

Discussion Text

A locally logged-in user who presses Ctrl-Alt-Del when at the console can reboot the system. If accidentally pressed, as could happen in the case of a mixed operating system environment, this can create the risk of short-term loss of systems' availability due to unintentional reboot.

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

IA Controls

NIST SP 800-53

Not mappedCCI-002385

References

DPMS Target Red Hat Enterprise Linux 10 DISA DPMS Target Red Hat Enterprise Linux 10 5733

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.rhel10os:def:281285
# RHEL 10 must prevent a user from overriding the Ctrl-Alt-Del sequence settings for the graphical user interface.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# /org/gnome/settings-daemon/plugins/media-keys/logout is locked in /etc/dconf/db/local.d/locks/*
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -rqP --include='*' '^/org/gnome/settings-daemon/plugins/media-keys/logout$' '/etc/dconf/db/local.d/locks' &>/dev/null
}

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.rhel10os:def:281285

if [ ! -d "/etc/dconf/db/local.d/locks" ]; then
    echo "FAIL"
    exit 1
fi

if [ ! -f "/etc/dconf/db/local.d/locks/session" ]; then
    echo "PASS"
    exit 0
fi

grep -q "^/org/gnome/settings-daemon/plugins/media-keys/logout$" "/etc/dconf/db/local.d/locks/session" || {
    echo "FAIL"
    exit 1
}

echo "PASS"
exit 0

Remediation

Configure RHEL 10 to disallow the user changing the Ctrl-Alt-Del sequence in the GNOME desktop.

Note: The example below is using the database "local" for the system. If the system is using another database in "/etc/dconf/profile/user", the file should be created under the appropriate subdirectory.

Update the "/etc/dconf/db/local.d/locks/session" file to prevent nonprivileged users from modifying the Ctrl-Alt-Del setting:

$ sudo vi /etc/dconf/db/local.d/locks/session

/org/gnome/settings-daemon/plugins/media-keys/logout

Run the following command to update the database:

$ sudo dconf update