Check: RHEL-09-271070
RHEL 9 STIG:
RHEL-09-271070
(in versions v1 r3 through v1 r1)
Title
RHEL 9 must prevent a user from overriding the session idle-delay setting for the graphical user interface. (Cat II impact)
Discussion
A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not logout because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, the GNOME desktop can be configured to identify when a user's session has idled and take action to initiate the session lock. As such, users should not be allowed to change session settings. Satisfies: SRG-OS-000029-GPOS-00010, SRG-OS-000031-GPOS-00012
Check Content
Verify RHEL 9 prevents a user from overriding settings for graphical user interfaces. Note: This requirement assumes the use of the RHEL 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. Determine which profile the system database is using with the following command: $ sudo grep system-db /etc/dconf/profile/user system-db:local Check that graphical settings are locked from nonprivileged user modification with the following command: Note: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used. $ sudo grep -i idle /etc/dconf/db/local.d/locks/* /org/gnome/desktop/session/idle-delay If the command does not return at least the example result, this is a finding.
Fix Text
Configure RHEL 9 to prevent a user from overriding settings for graphical user interfaces. Create a database to contain the system-wide screensaver settings (if it does not already exist) with the following command: Note: The example below is using the database "local" for the system, so if the system is using another database in "/etc/dconf/profile/user", the file should be created under the appropriate subdirectory. $ sudo touch /etc/dconf/db/local.d/locks/session Add the following setting to prevent nonprivileged users from modifying it: /org/gnome/desktop/session/idle-delay
Additional Identifiers
Rule ID: SV-258024r926059_rule
Vulnerability ID: V-258024
Group Title: SRG-OS-000029-GPOS-00010
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000057 |
The information system initiates a session lock after the organization-defined time period of inactivity. |
CCI-000060 |
The information system conceals, via the session lock, information previously visible on the display with a publicly viewable image. |