The systemd Ctrl-Alt-Delete burst key sequence in AlmaLinux OS 9 must be disabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-269140 | ALMA-09-006620 | SV-269140r1050022_rule | CCI-002235 | high |
| Description | ||||
| A locally logged-on user who presses Ctrl-Alt-Delete in quick succession 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. | ||||
| STIG | Date | |||
| CloudLinux AlmaLinux OS 9 Security Technical Implementation Guide | 2025-05-22 | |||
Details
Check Text (C-269140r1050022_chk)
Verify AlmaLinux OS 9 is configured to not 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 | grep -v '#' | grep CtrlAltDel
CtrlAltDelBurstAction=none
If "CtrlAltDelBurstAction" is not set to "none", is commented out, or is missing, this is a finding.
Fix Text (F-73072r1047797_fix)
Configure the system to disable the CtrlAltDelBurstAction by added or modifying the following line in the "/etc/systemd/system.conf" configuration file:
CtrlAltDelBurstAction=none
Reload the daemon for this change to take effect.
$ systemctl daemon-reexec