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The SUSE operating system must disable the x86 Ctrl-Alt-Delete key sequence.


Finding ID Version Rule ID IA Controls Severity
V-217159 SLES-12-010610 SV-217159r646722_rule High
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.
SLES 12 Security Technical Implementation Guide 2022-12-06


Check Text ( C-18387r646720_chk )
Verify the SUSE operating system is not configured to reboot the system when Ctrl-Alt-Delete is pressed.

Check that the ctrl-alt-del.target is masked with the following command:

> systemctl status ctrl-alt-del.target

Loaded: masked (/dev/null; masked)
Active: inactive (dead)

If the ctrl-alt-del.target is not masked, this is a finding.
Fix Text (F-18385r646721_fix)
Configure the system to disable the Ctrl-Alt-Delete sequence for the command line with the following commands:

> sudo systemctl disable ctrl-alt-del.target

> sudo systemctl mask ctrl-alt-del.target

And reload the daemon to take effect

> sudo systemctl daemon-reload