Vulnerability 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. 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.

Check

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:

> systemd-analyze cat-config systemd/system.conf

# /etc/systemd/system.conf.d/55-CtrlAltDel-BurstAction.conf
CtrlAltDelBurstAction=none

If the "CtrlAltDelBurstAction" is not set to "none", commented out, or is missing, this is a finding.
If the setting is not configured in a drop in file, this is a finding.

Fix

Configure the system to disable the CtrlAltDelBurstAction by adding it to a drop file in a "/etc/systemd/system.conf.d/" configuration file:

If no drop file exists, create one with the following command:

> sudo touch /etc/systemd/system.conf.d/55-CtrlAltDel-BurstAction

Edit the file to contain the setting by adding the following text:

CtrlAltDelBurstAction=none

Reload the daemon for this change to take effect:

> sudo systemctl daemon-reexec