The systemd Ctrl-Alt-Delete burst key sequence in TOSS must be disabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-252938 | TOSS-04-010360 | SV-252938r991589_rule | CCI-000366 | high |
| Description | ||||
| 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. | ||||
| STIG | Date | |||
| Tri-Lab Operating System Stack (TOSS) 4 Security Technical Implementation Guide | 2025-05-08 | |||
Details
Check Text (C-252938r991589_chk)
Verify TOSS 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
CtrlAltDelBurstAction=none
If the "CtrlAltDelBurstAction" is not set to "none", commented out, or is missing, this is a finding.
Fix Text (F-56341r824137_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.
$ sudo systemctl daemon-reload