AlmaLinux OS 9 must require authentication to access single-user mode.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-269139 | ALMA-09-006510 | SV-269139r1050021_rule | CCI-000213 | medium |
| Description | ||||
| This requirement prevents attackers with physical access from easily bypassing security on the machine and gaining root access. Such accesses are further prevented by configuring the bootloader password. | ||||
| STIG | Date | |||
| CloudLinux AlmaLinux OS 9 Security Technical Implementation Guide | 2025-05-22 | |||
Details
Check Text (C-269139r1050021_chk)
Verify that AlmaLinux OS 9 requires authentication for single-user mode with the following command:
$ grep -E 'ExecStart.*sulogin' /usr/lib/systemd/system/rescue.service
ExecStart=-/usr/lib/systemd/systemd-sulogin-shell rescue
If this line is not returned or is commented out, this is a finding.
Fix Text (F-73071r1049179_fix)
Configure AlmaLinux OS 9 to require authentication for single-user mode.
Add or modify the following line in the "/usr/lib/systemd/system/rescue.service" file:
ExecStart=-/usr/lib/systemd/systemd-sulogin-shell rescue
"sudo systemctl edit rescue.service" can also be used to create a "/etc/systemd/system/rescue.service.d/override.conf" file.