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


Finding ID Version Rule ID IA Controls Severity
V-234990 SLES-15-040062 SV-234990r622137_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. In the graphical user interface environment, risk of unintentional reboot from the Ctrl-Alt-Delete sequence is reduced because the user will be prompted before any action is taken.
SUSE Linux Enterprise Server 15 Security Technical Implementation Guide 2022-12-07


Check Text ( C-38178r619239_chk )
Verify the SUSE operating system is not configured to reboot the system when Ctrl-Alt-Delete is pressed seven times within two seconds with the following command:

> sudo grep -i ctrl /etc/systemd/system.conf


If the "CtrlAltDelBurstAction" is not set to "none", commented out, or is missing, this is a finding.
Fix Text (F-38141r619240_fix)
Configure the system to disable the CtrlAltDelBurstAction by added or modifying the following line in the "/etc/systemd/system.conf" configuration file:


Reload the daemon for this change to take effect

> sudo systemctl daemon-reload