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V-281282

CAT II (Medium)

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

Rule ID

SV-281282r1166798_rule

STIG

Red Hat Enterprise Linux 10 Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-000060

Discussion

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

Check Content

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.

Fix Text

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