← Back to Canonical Ubuntu 22.04 LTS Security Technical Implementation Guide

V-260469

CAT I (High)

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

Rule ID

SV-260469r991589_rule

STIG

Canonical Ubuntu 22.04 LTS Security Technical Implementation Guide

Version

V2R8

CCIs

CCI-000366

Discussion

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.

Check Content

Verify Ubuntu 22.04 LTS is not configured to reboot the system when Ctrl-Alt-Delete is pressed by using the following command: 
 
     $ systemctl status ctrl-alt-del.target 
     ctrl-alt-del.target 
          Loaded: masked (Reason: Unit ctrl-alt-del.target is masked.) 
          Active: inactive (dead) 
 
If the "ctrl-alt-del.target" is not masked, this is a finding.

Fix Text

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