OL 9 must not have a graphical display manager installed unless approved.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-271465 | OL09-00-000145 | SV-271465r1091107_rule | CCI-000382 | medium |
| Description | ||||
| Unnecessary service packages must not be installed to decrease the attack surface of the system. Graphical display managers have a long history of security vulnerabilities and must not be used, unless approved and documented. | ||||
| STIG | Date | |||
| Oracle Linux 9 Security Technical Implementation Guide | 2025-05-08 | |||
Details
Check Text (C-271465r1091107_chk)
Verify that OL 9 does not have a graphical user interface installed with the following command:
$ dnf list --installed "xorg*common"
Error: No matching Packages to list
If the "x11-server-common" package is installed, and the use of a graphical user interface has not been documented with the information system security officer (ISSO) as an operational requirement, this is a finding.
Fix Text (F-75422r1091106_fix)
Remove all xorg packages with the following command:
Warning: If accessing the system through the graphical user interface, change to the multi-user.target with the following command:
$ sudo systemctl isolate multi-user.target
Warning: Removal of the graphical user interface will immediately render it useless. The following commands must not be run from a virtual terminal emulator in the graphical interface.
$ sudo dnf remove "xorg*"
$ sudo systemctl set-default multi-user.target
If there is an operational requirement for a graphical user interface it must be documented with the ISSO.