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

TOSS must not allow an unattended or automatic logon to the system.

DISA Rule

SV-252945r991591_rule

Vulnerability Number

V-252945

Group Title

SRG-OS-000480-GPOS-00229

Rule Version

TOSS-04-010430

Severity

CAT I

CCI(s)

CCI-000366 - Implement the security configuration settings.

Weight

Fix Recommendation

Configure TOSS to not allow an unattended or automatic logon to the system via a graphical user interface.

Add or edit the line for the "AutomaticLoginEnable" parameter in the [daemon] section of the "/etc/gdm/custom.conf" file to "false":

[daemon]
AutomaticLoginEnable=false

Check Contents

Verify TOSS does not allow an unattended or automatic logon to the system via a graphical user interface.

Note: This requirement assumes the use of the TOSS default graphical user interface, Gnome Shell. If the system does not have any graphical user interface installed, this requirement is Not Applicable.

Check for the value of the "AutomaticLoginEnable" in the "/etc/gdm/custom.conf" file with the following command:

$ sudo grep -i automaticloginenable /etc/gdm/custom.conf
AutomaticLoginEnable=false

If the value of "AutomaticLoginEnable" is missing or is not set to "false", this is a finding. If it does, this is a finding. Automatic logon as an authorized user allows access to any user with physical access to the operating system.

Vulnerability Number

V-252945

Documentable

False

Rule Version

TOSS-04-010430

Severity Override Guidance

Check Content Reference

Target Key

5469