SLEM 5 SSH daemon must be configured to not allow authentication using known hosts authentication.

Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere.

Verify SLEM 5 SSH daemon is configured to not allow authentication using "known hosts" 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*ignoreuserknownhosts'
     /etc/ssh/sshd_config:IgnoreUserKnownHosts yes

If "IgnoreUserKnownHosts" is not set to "no", is commented out, missing, or conflicting results are returned, this is a finding.

Configure SLEM 5 SSH daemon to not allow authentication using "known hosts" authentication.

Add or modify the following line in the "/etc/ssh/sshd_config" file:

IgnoreUserKnownHosts yes

Restart the SSH daemon in order for the changes to take effect:

     > sudo systemctl restart sshd.service