TOSS 5 must disable the user list at logon for graphical user interfaces.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-282720 | TOSS-05-000283 | SV-282720r1201591_rule | CCI-000366 | medium |
| Description | ||||
| Leaving the user list enabled is a security risk since it allows anyone with physical access to the system to enumerate known user accounts without authenticated access to the system. | ||||
| STIG | Date | |||
| Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide | 2026-04-01 | |||
Details
Check Text (C-282720r1201591_chk)
Verify TOSS 5 disables the user logon list for graphical user interfaces 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 any graphical user interface installed, this requirement is not applicable.
$ sudo gsettings get org.gnome.login-screen disable-user-list
true
If the setting is "false", this is a finding.
Fix Text (F-87186r1201590_fix)
Configure TOSS 5 to disable the user list at logon for graphical user interfaces.
Create a database to contain the systemwide screensaver settings (if it does not already exist) using the following command:
Note: The example below is using the database "local" for the system, so if the system is using another database in "/etc/dconf/profile/user", the file should be created under the appropriate subdirectory.
$ sudo touch /etc/dconf/db/local.d/02-login-screen
[org/gnome/login-screen]
disable-user-list=true
Update the system databases:
$ sudo dconf update