The TOSS SSH daemon must not allow authentication using known host's authentication.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-252942 | TOSS-04-010400 | SV-252942r991589_rule | Medium |
| Description |
| Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere. |
| STIG | Date |
| Tri-Lab Operating System Stack (TOSS) 4 Security Technical Implementation Guide | 2025-05-08 |
Details
| Check Text (C-56395r824148_chk) |
| Verify the SSH daemon does not allow authentication using known host's authentication with the following command: $ sudo grep -i IgnoreUserKnownHosts /etc/ssh/sshd_config IgnoreUserKnownHosts yes If the value is returned as "no", the returned line is commented out, or no output is returned, this is a finding. |
| Fix Text (F-56345r824149_fix) |
| Configure the SSH daemon to not allow authentication using known host's authentication. Add the following line in "/etc/ssh/sshd_config" or uncomment the line and set the value to "yes": IgnoreUserKnownHosts yes 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 |