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 a graphical user 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 OL 8 is not configured to reboot the system when Ctrl-Alt-Delete is pressed when using a graphical user interface with the following command:
$ sudo grep logout /etc/dconf/db/local.d/*
logout=''
If the "logout" key is bound to an action, is commented out, or is missing, this is a finding.
Fix
Configure the system to disable the Ctrl-Alt-Delete sequence when using a graphical user interface by creating or editing the "/etc/dconf/db/local.d/00-disable-CAD" file.
Add the setting to disable the Ctrl-Alt-Delete sequence for a graphical user interface:
[org/gnome/settings-daemon/plugins/media-keys]
logout=''
Update the dconf settings:
$ sudo dconf update