Information
The AlmaLinux OS 9 debug-shell systemd service must be disabled.
GROUP ID: V-269143
RULE ID: SV-269143r1050025
The debug-shell requires no authentication and provides root privileges to anyone who has physical access to the machine.
While this feature is disabled by default, masking it adds an additional layer of assurance that it will not be enabled via a dependency in systemd.
This also prevents attackers with physical access from easily bypassing security on the machine through valid troubleshooting configurations and gaining root access when the system is rebooted.
Solution
Configure AlmaLinux OS 9 to mask the debug-shell systemd service with the following command:
$ systemctl mask --now debug-shell.service