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

The systemd Ctrl-Alt-Delete burst key sequence in TOSS must be disabled.

DISA Rule

SV-252938r1155810_rule

Vulnerability Number

V-252938

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

TOSS-04-010360

Severity

CAT I

CCI(s)

CCI-000366 - Implement the security configuration settings.

Weight

Fix Recommendation

Configure TOSS 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 mkdir -p /etc/systemd/system.conf.d && sudo vi /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-reload

Check Contents

Verify TOSS is configured to not reboot the system when Ctrl-Alt-Delete is pressed seven times within two seconds with the following command:

$ sudo grep -iR CtrlAltDelBurstAction /etc/systemd/system*
/etc/systemd/system.conf.d/55-CtrlAltDel-BurstAction:CtrlAltDelBurstAction=none

If the "CtrlAltDelBurstAction" is not set to "none", commented out, or is missing, this is a finding.

Vulnerability Number

V-252938

Documentable

False

Rule Version

TOSS-04-010360

Severity Override Guidance

Check Content Reference

Target Key

5469