AlmaLinux OS 9 must not allow a noncertificate trusted host SSH logon to the system.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-269264 | ALMA-09-020810 | SV-269264r1050146_rule | Medium |
| Description |
| SSH trust relationships mean a compromise on one host can allow an attacker to move trivially to other hosts. |
| STIG | Date |
| CloudLinux AlmaLinux OS 9 Security Technical Implementation Guide | 2025-05-22 |
Details
| Check Text (C-73295r1048168_chk) |
| Verify the operating system does not allow a noncertificate trusted host SSH logon to the system with the following command: $ sshd -T | grep hostbasedauthentication hostbasedauthentication no If the "HostbasedAuthentication" keyword is not set to "no", this is a finding. |
| Fix Text (F-73196r1049409_fix) |
| Configure the AlmaLinux OS 9 SSH daemon to not allow a noncertificate trusted host SSH logon to the system with the following command: Add the following line to "/etc/ssh/sshd_config", or uncomment the line and set the value to "no": HostbasedAuthentication no Alternatively, add the setting to an include file if the line "Include /etc/ssh/sshd_config.d/*.conf" is found at the top of the "/etc/ssh/sshd_config" file: $ echo 'HostbasedAuthentication no' > /etc/ssh/sshd_config.d/40-hostbasedauthentication.conf Restart the SSH daemon for the settings to take effect: $ systemctl restart sshd.service |