STIGQter STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 4 Security Technical Implementation Guide Version: 2 Release: 6 Benchmark Date: 01 Jul 2026:

The x86 Ctrl-Alt-Delete key sequence must be disabled on TOSS.

DISA Rule

SV-253109r991589_rule

Vulnerability Number

V-253109

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

TOSS-04-040680

Severity

CAT I

CCI(s)

Weight

10

Fix Recommendation

Configure the system to disable the Ctrl-Alt-Delete sequence for the command line with the following command:

$ sudo systemctl mask ctrl-alt-del.target

Created symlink /etc/systemd/system/ctrl-alt-del.target -> /dev/null

Reload the daemon for this change to take effect.

$ sudo systemctl daemon-reload

Check Contents

Verify TOSS is not configured to reboot the system when Ctrl-Alt-Delete is pressed with the following command:

$ sudo systemctl status ctrl-alt-del.target

ctrl-alt-del.target
Loaded: masked (Reason: Unit ctrl-alt-del.target is masked.)
Active: inactive (dead)

If the "ctrl-alt-del.target" is loaded and not masked, this is a finding.

Vulnerability Number

V-253109

Documentable

False

Rule Version

TOSS-04-040680

Severity Override Guidance

Verify TOSS is not configured to reboot the system when Ctrl-Alt-Delete is pressed with the following command:

$ sudo systemctl status ctrl-alt-del.target

ctrl-alt-del.target
Loaded: masked (Reason: Unit ctrl-alt-del.target is masked.)
Active: inactive (dead)

If the "ctrl-alt-del.target" is loaded and not masked, this is a finding.

Check Content Reference

M

Target Key

5469