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The Ubuntu operating system must not allow unattended or automatic login via SSH.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-238218 | UBTU-20-010047 | SV-238218r653829_rule | High |
| Description |
|---|
| Failure to restrict system access to authenticated users negatively impacts Ubuntu operating system security. |
| STIG | Date |
|---|---|
| Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide | 2021-11-19 |
Details
| Check Text ( C-41428r653827_chk ) |
|---|
| Verify 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", are missing completely, or are commented out, this is a finding. |
| Fix Text (F-41387r653828_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 Restart the SSH daemon for the changes to take effect: $ sudo systemctl restart sshd.service |