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 permissions of "/etc/ssh/sshd_config" and any "/etc/ssh/sshd_config.d/*.conf" files with the following command:

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

600 /etc/ssh/sshd_config
755 /etc/ssh/sshd_config.d
600 /etc/ssh/sshd_config.d/40-stig.conf
600 /etc/ssh/sshd_config.d/50-redhat.conf
600 /etc/ssh/sshd_config.d/clientalive.conf

If any of the files do not have "0600" permissions, this is a finding.

Fix

Configure the SSHD config files to have "0600" permissions with the following command:

$ chmod 0600 /etc/ssh/sshd_config /etc/ssh/sshd_config.d/*.conf