OL 9 must conceal, via the session lock, information previously visible on the display with a publicly viewable image.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-271676	SRG-OS-000031-GPOS-00012	OL09-00-002106	SV-271676r1091740_rule	2025-05-08	1

Description
Setting the screensaver mode to blank-only conceals the contents of the display from passersby.

ℹ️ Check
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.

ℹ️ Check

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
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

✔️ 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