Check: RHEL-09-271015
RHEL 9 STIG:
RHEL-09-271015
(in versions v1 r3 through v1 r1)
Title
RHEL 9 must prevent a user from overriding the banner-message-enable setting for the graphical user interface. (Cat II impact)
Discussion
Display of a standardized and approved use notification before granting access to the operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. For U.S. Government systems, system use notifications are required only for access via login interfaces with human users and are not required when such human interfaces do not exist. Satisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000228-GPOS-00088
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 banner-message-enable /etc/dconf/db/local.d/* /org/gnome/login-screen/banner-message-enable If the output is not "/org/gnome/login-screen/banner-message-enable", the line is commented out, or the line is missing, this is a finding.
Fix Text
Configure RHEL 9 to prevent a user from overriding the banner setting for graphical user interfaces. Create a database to contain the system-wide graphical user logon settings (if it does not already exist) with the following command: $ sudo touch /etc/dconf/db/local.d/locks/session Add the following setting to prevent nonprivileged users from modifying it: banner-message-enable Run the following command to update the database: $ sudo dconf update
Additional Identifiers
Rule ID: SV-258013r926026_rule
Vulnerability ID: V-258013
Group Title: SRG-OS-000023-GPOS-00006
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-000048 |
The information system displays an organization-defined system use notification message or banner before granting access to the system that provides privacy and security notices consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. |
| CCI-001384 |
The information system, for publicly accessible systems, displays system use information organization-defined conditions before granting further access. |
| CCI-001385 |
The information system, for publicly accessible systems, displays references, if any, to monitoring that are consistent with privacy accommodations for such systems that generally prohibit those activities. |
| CCI-001386 |
The information system, for publicly accessible systems, displays references, if any, to recording that are consistent with privacy accommodations for such systems that generally prohibit those activities. |
| CCI-001387 |
The information system, for publicly accessible systems, displays references, if any, to auditing that are consistent with privacy accommodations for such systems that generally prohibit those activities. |
| CCI-001388 |
The information system, for publicly accessible systems, includes a description of the authorized uses of the system. |
Controls
| Number | Title |
|---|---|
| AC-8 |
System Use Notification |