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UBTU-24-200043 Ubuntu 24.04 LTS must conceal, via the session lock, information previously visible on the display with a publicly viewable image.

DISA STIG library V1R7
All changes in this version
first version loaded CAT II

Maps to AC-11(1) via CCI-000060

Title

Ubuntu 24.04 LTS must conceal, via the session lock, information previously visible on the display with a publicly viewable image.

Control

Note: This requirement assumes the use of the Ubuntu 24.04 LTS default graphical user interface, the GNOME desktop environment. If the system does not have any graphical user interface installed, this requirement is Not Applicable. To verify the screensaver is configured to be blank, run the following command: $ gsettings writable org.gnome.desktop.screensaver picture-uri false If "picture-uri" is writable and the result is "true", this is a finding.

Discussion

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

Related controls

CCI-000060

Fix

Configure Ubuntu 24.04 LTS to prevent a user from overriding the picture-uri setting for graphical user interfaces. In the file "/etc/dconf/db/local.d/00-security-settings", add or update the following lines: [org/gnome/desktop/screensaver] picture-uri='' Prevent user modification by adding the following line to "/etc/dconf/db/local.d/locks/00-security-settings-lock": /org/gnome/desktop/screensaver/picture-uri Update the dconf system databases: $ sudo dconf update