| name | cis-ubuntu1604-v200-1-8-2 |
| description | Ensure GDM login banner is configured |
| category | cis-iam |
| version | 2.0.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-16.04","gdm","gnome","banner","login","display-manager"] |
| cis_id | 1.8.2 |
| cis_benchmark | CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - 1.8.2
Profile Applicability
- Level 1 - Server
- Level 1 - Workstation
Description
GDM is the GNOME Display Manager which handles graphical login for GNOME based systems.
Rationale
Warning messages inform users who are attempting to login to the system of their legal status regarding the system and must include the name of the organization that owns the system and any monitoring policies that are in place.
Audit Procedure
Command Line
If GDM is installed on the system verify that /etc/gdm3/greeter.dconf-defaults file exists and contains the following:
[org/gnome/login-screen]
banner-message-enable=true
banner-message-text='<banner message>'
Expected Result
The GDM login banner should be enabled with an appropriate banner message.
Remediation
Command Line
Edit or create the file /etc/gdm3/greeter.dconf-defaults and add the following:
[org/gnome/login-screen]
banner-message-enable=true
banner-message-text='<banner message>'
disable-user-list=true
Example banner message: 'Authorized uses only. All activity may be monitored and reported.'
Run the following command to re-load GDM on the next login or reboot:
dpkg-reconfigure gdm3
Additional Information
Additional options and sections may appear in the /etc/dconf/db/gdm.d/01-banner-message file.
If a different GUI login service is in use, consult your documentation and apply an equivalent banner.
Default Value
Not applicable.
References
None.
CIS Controls
| Controls Version | Control |
|---|
| v7 | 5.1 Establish Secure Configurations |
Assessment Status
Automated