The TOSS 5 SSH server configuration file must be group-owned by root.

Service configuration files enable or disable features of their respective services, which if configured incorrectly, can lead to insecure and vulnerable configurations. Therefore, service configuration files must be owned by the correct group to prevent unauthorized changes.

Verify the group ownership of the "/etc/ssh/sshd_config" file using the following command:

$ ls -al /etc/ssh/sshd_config

rw-------. 1 root root 3669 Feb 22 11:34 /etc/ssh/sshd_config

If the "/etc/ssh/sshd_config" file does not have a group owner of "root", this is a finding.

Configure the "/etc/ssh/sshd_config" file to be group-owned by root using the following command:

$ sudo chgrp root /etc/ssh/sshd_config