The graphical display manager must not be the default target on AlmaLinux OS 9 unless approved.

STIG ID: ALMA-09-014320 |  SRG: SRG-OS-000480-GPOS-00227 |  Severity: medium |  CCI:  | Vulnerability Id: V-269206

Vulnerability Discussion

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.

Check

Document the requirement for a graphical user interface with the ISSO or set the default target to multi-user with the following command:

$ systemctl set-default multi-user.target

Fix

Verify that AlmaLinux OS 9 is configured to boot to the command line:

$ systemctl get-default

multi-user.target

If the system default target is not set to "multi-user.target" and the information system security officer (ISSO) lacks a documented requirement for a graphical user interface, this is a finding.