Vulnerability Discussion

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.

Check

Verify the group ownership of the "/etc/ssh/sshd_config" file and the contents of "/etc/ssh/sshd_config.d" with the following command:

$ sudo find /etc/ssh/sshd_config /etc/ssh/sshd_config.d -exec stat -c "%G %n" {} \;

root /etc/ssh/sshd_config
root /etc/ssh/sshd_config.d
root /etc/ssh/sshd_config.d/50-cloud-init.conf
root /etc/ssh/sshd_config.d/50-redhat.conf

If the "/etc/ssh/sshd_config" file or "/etc/ssh/sshd_config.d" or any files in the sshd_config.d directory do not have a group owner of "root", this is a finding.

Fix

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

$ sudo chgrp root /etc/ssh/sshd_config