STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 26 Mar 2026:

TOSS 5 must enable a user session lock until that user reestablishes access using established identification and authentication procedures for graphical user sessions.

DISA Rule

SV-282374r1201498_rule

Vulnerability Number

V-282374

Group Title

SRG-OS-000028-GPOS-00009

Rule Version

TOSS-05-000271

Severity

CAT II

CCI(s)

CCI-000056 - Retain the device lock until the user reestablishes access using established identification and authentication procedures.
CCI-000057 - The information system initiates a session lock after the organization-defined time period of inactivity.

Weight

Fix Recommendation

Configure TOSS 5 to enable a user's session lock until that user reestablishes access using established identification and authentication procedures.

Create a database to contain the systemwide screensaver settings (if it does not already exist) with the following example:

$ sudo vi /etc/dconf/db/local.d/00-screensaver

Edit the "[org/gnome/desktop/screensaver]" section of the database file and add or update the following lines:

# Set this to true to lock the screen when the screensaver activates
lock-enabled=true

Update the system databases:

$ sudo dconf update

Check Contents

Verify TOSS 5 enables a user's session lock until that user reestablishes access using established identification and authentication procedures using the following command:

Note: This requirement assumes the use of the TOSS 5 default graphical user interface—the GNOME desktop environment. If the system does not have a graphical user interface installed, this requirement is not applicable.

$ gsettings get org.gnome.desktop.screensaver lock-enabled

true

If the setting is "false", this is a finding.

Vulnerability Number

V-282374

Documentable

False

Rule Version

TOSS-05-000271

Severity Override Guidance

Check Content Reference

Target Key

5738