Ubuntu 24.04 LTS must not allow unattended or automatic login via SSH.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-270717 | UBTU-24-300031 | SV-270717r1067177_rule | High |
| Description |
| Failure to restrict system access to authenticated users negatively impacts Ubuntu 24.04 LTS security. |
| STIG | Date |
| Canonical Ubuntu 24.04 LTS Security Technical Implementation Guide | 2025-05-16 |
Details
| Check Text (C-74750r1067177_chk) |
| Verify unattended or automatic login via SSH is disabled with the following command: $ egrep -r '(Permit(.*?)(Passwords|Environment))' /etc/ssh/sshd_config PermitEmptyPasswords no PermitUserEnvironment no If the "PermitEmptyPasswords" or "PermitUserEnvironment" keywords are set to a value other than "no", are commented out, are both missing, or conflicting results are returned, this is a finding. |
| Fix Text (F-74651r1066639_fix) |
| Configure Ubuntu 24.04 LTS to allow the SSH daemon to not allow unattended or automatic login to the system. Add or edit the following lines in the "/etc/ssh/sshd_config" file: PermitEmptyPasswords no PermitUserEnvironment no Restart the SSH daemon for the changes to take effect: $ sudo systemctl restart sshd.service |