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RHEL-10-700790 RHEL 10 must conceal, via the session lock, information previously visible on the display with a publicly viewable image.

DISA STIG library V1R3
All changes in this version
first version loaded CAT II

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

Title

RHEL 10 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 RHEL 10 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 RHEL 10 prevents a user from overriding settings a blank screensaver with 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 RHEL 10 to prevent a user from overriding the picture-uri setting for graphical user interfaces. Note: The example below is using the database "local" for the system. If the system is using another database in "/etc/dconf/profile/user", the file should be created under the appropriate subdirectory. Update the "/etc/dconf/db/local.d/00-security-settings" file to prevent a user from overriding the "picture-uri" setting: $ sudo vi /etc/dconf/db/local.d/00-security-settings [org/gnome/desktop/screensaver] picture-uri='' Update the "/etc/dconf/db/local.d/locks/00-security-settings-lock" file to prevent a user from modifying the lock applied to the "picture-uri" setting: $ sudo vi /etc/dconf/db/local.d/locks/00-security-settings-lock /org/gnome/desktop/screensaver/picture-uri Update the dconf system databases: $ sudo dconf update