OL 9 must not have a graphical display manager installed unless approved.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-271465	SRG-OS-000480-GPOS-00227	OL09-00-000145	SV-271465r1091107_rule	2025-05-08	1

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.

ℹ️ Check
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
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.

✔️ 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.