Unattended or automatic login via ssh must not be allowed.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-75833 | UBTU-16-030250 | SV-90513r2_rule | High |
| Description |
|---|
| Failure to restrict system access to authenticated users negatively impacts Ubuntu operating system security. |
| STIG | Date |
|---|---|
| Canonical Ubuntu 16.04 Security Technical Implementation Guide | 2019-03-13 |
Details
| Check Text ( C-75521r1_chk ) |
|---|
| Verify that unattended or automatic login via ssh is disabled. Check that unattended or automatic login via ssh is disabled with the following command: # egrep '(Permit(.*?)(Passwords|Environment))' /etc/ssh/sshd_config PermitEmptyPasswords no PermitUserEnvironment no If "PermitEmptyPasswords" or "PermitUserEnvironment" keywords are not set to "no", is missing completely, or they are commented out, this is a finding. |
| Fix Text (F-82463r2_fix) |
|---|
| Configure the Ubuntu operating system 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 The SSH daemon must be restarted for the changes to take effect. To restart the SSH daemon, run the following command: # sudo systemctl restart sshd.service |