Ubuntu 24.04 LTS must not allow unattended or automatic login via SSH.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| high | V-270717 | SRG-OS-000480-GPOS-00229 | UBTU-24-300031 | SV-270717r1067177_rule | 2025-02-18 | 1 |
| Description |
|---|
| Failure to restrict system access to authenticated users negatively impacts Ubuntu 24.04 LTS security. |
| ℹ️ Check |
|---|
| 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 |
|---|
| 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 |