SV-260469r991589: Ubuntu 22.04 LTS must disable the x86 Ctrl-Alt-Delete key sequence. | Canonical Ubuntu 22.04 LTS STIG SCAP Benchmark

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Assessment Title

Rule Text

Ubuntu 22.04 LTS must disable the x86 Ctrl-Alt-Delete key sequence.

Description

Discussion Text

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

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366

References

DPMS Target Canonical Ubuntu 22.04 LTS DISA DPMS Target Canonical Ubuntu 22.04 LTS 5594

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.ubuntu2204os:def:260469
# Ubuntu 22.04 LTS must disable the x86 Ctrl-Alt-Delete key sequence.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# ctrl-alt-del.target LoadState is masked if it exists.
# systemdunitproperty_object (systemdunitproperty_test)
test_1() {
  (systemctl show -p 'LoadState' --value 'ctrl-alt-del.target') | grep -qxF 'masked'
}
# ctrl-alt-del.target UnitFileState is masked if it exists.
# systemdunitproperty_object (systemdunitproperty_test)
test_2() {
  (systemctl show -p 'UnitFileState' --value 'ctrl-alt-del.target') | grep -qxF 'masked'
}

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 definition: oval:mil.disa.stig.ubuntu2204os:def:260469
if ! command -v systemctl &> /dev/null; then echo "PASS"; exit 0; fi
if systemctl is-enabled ctrl-alt-del.target &> /dev/null; then echo "FAIL"; exit 1; fi
if systemctl is-masked ctrl-alt-del.target &> /dev/null; then echo "PASS"; exit 0; fi
echo "FAIL"; exit 1

Remediation

Configure Ubuntu 22.04 LTS to disable the Ctrl-Alt-Delete sequence for the command line by using the following commands: 
 
     $ sudo systemctl disable ctrl-alt-del.target 
 
     $ sudo systemctl mask ctrl-alt-del.target 
 
Reload the daemon to take effect:  
 
     $ sudo systemctl daemon-reload