Ubuntu OS must disable the x86 Ctrl-Alt-Delete key sequence.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-275565 | RIIM-OS-211015 | SV-275565r1147745_rule | CCI-000366 | medium |
| Description | ||||
| 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. | ||||
| STIG | Date | |||
| Riverbed NetIM OS Security Technical Implementation Guide | 2025-10-02 | |||
Details
Check Text (C-275565r1147745_chk)
Verify Ubuntu OS 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 (F-79572r1147744_fix)
Configure Ubuntu OS 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