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 retain a user's session lock until that user reestablishes access using established identification and authentication procedures.

DISA Rule

SV-252948r1016304_rule

Vulnerability Number

V-252948

Group Title

SRG-OS-000028-GPOS-00009

Rule Version

TOSS-04-020020

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.
• CCI-000060 - Conceal, via the device lock, information previously visible on the display with a publicly viewable image.

Weight

10

Fix Recommendation

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

Create a database to contain the system-wide 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 retains a user's session lock until that user reestablishes access using established identification and authentication procedures with the following command:

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.

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

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

Vulnerability Number

V-252948

Documentable

False

Rule Version

TOSS-04-020020

Severity Override Guidance

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

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.

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

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

Check Content Reference

M

Target Key

5469