A graphical display manager must not be installed on AlmaLinux OS 9 unless approved.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-269354	SRG-OS-000095-GPOS-00049	ALMA-09-031040	SV-269354r1050237_rule	2025-02-20	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 a graphical user interface is not installed with the following command: $ dnf list --installed "xorg-x11-server-common" Error: No matching Packages to list If the "xorg-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
Document the requirement for a graphical user interface with the ISSO or 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: $ 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. $ dnf remove "xorg*" $ systemctl set-default multi-user.target

✔️ Fix

Document the requirement for a graphical user interface with the ISSO or 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: $ 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. $ dnf remove "xorg*" $ systemctl set-default multi-user.target