OL 9 SSH daemon must not allow rhosts authentication.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-271711 | OL09-00-002348 | SV-271711r1091845_rule | Medium |
| Description |
| SSH trust relationships mean a compromise on one host can allow an attacker to move trivially to other hosts. |
| STIG | Date |
| Oracle Linux 9 Security Technical Implementation Guide | 2025-05-08 |
Details
| Check Text (C-75761r1091843_chk) |
| Verify that OL 9 SSH daemon does not allow rhosts authentication with the following command: $ sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*ignorerhosts' IgnoreRhosts 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-75668r1091844_fix) |
| Configure the SSH daemon to not allow rhosts authentication. Add the following line to "/etc/ssh/sshd_config" or to a file in "/etc/ssh/sshd_config.d" or uncomment the line and set the value to "yes": IgnoreRhosts yes The SSH service must be restarted for changes to take effect: $ sudo systemctl restart sshd.service |