OL 9 must conceal, via the session lock, information previously visible on the display with a publicly viewable image.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-271676 | OL09-00-002106 | SV-271676r1091740_rule | CCI-000060 | medium |
| Description | ||||
| Setting the screensaver mode to blank-only conceals the contents of the display from passersby. | ||||
| STIG | Date | |||
| Oracle Linux 9 Security Technical Implementation Guide | 2025-05-08 | |||
Details
Check Text (C-271676r1091740_chk)
This requirement assumes the use of the OL 9 default graphical user interface—the GNOME desktop environment. If the system does not have any graphical user interface installed, this requirement is Not Applicable.
Verify that OL 9 configures the screensaver to be blank with the following command:
$ gsettings get org.gnome.desktop.screensaver picture-uri
If properly configured, the output should be "''".
To ensure that users cannot set the screensaver background, run the following:
$ grep picture-uri /etc/dconf/db/local.d/locks/*
If properly configured, the output should be "/org/gnome/desktop/screensaver/picture-uri".
If it is not set or configured properly, this is a finding.
Fix Text (F-75633r1091739_fix)
Configure OL 9 to conceal, via the session lock, information previously visible on the display with a publicly viewable image.
The dconf settings can be edited in the /etc/dconf/db/* location.
Add or update the [org/gnome/desktop/screensaver] section of the "/etc/dconf/db/local.d/00-security-settings" database file and add or update the following lines:
[org/gnome/desktop/screensaver]
picture-uri=''
Add the following line to "/etc/dconf/db/local.d/locks/00-security-settings-lock" to prevent user modification:
/org/gnome/desktop/screensaver/picture-uri
Update the dconf system databases:
$ sudo dconf update