Forwarders are not disabled on the CSS DNS.
CSS DNS is not vulnerable to attacks associated with recursion because it does not support recursion, but does offer a forwarder feature that sends un-resolvable or unsupported requests to another name server. This feature poses a risk because the forwarder feature merely redirects potential attacks to another name server.
The CSS DNS administrator should disable forwarders by entering the following command while in global configuration mode: no dns-server forwarder primary (if a primary) or no dns-server forwarder secondary (if a secondary).
In the presence of the reviewer, the CSS DNS administrator should enter the following command while in global configuration mode: show dns-server forwarder Confirm the DNS server forwarder primary and DNS server forwarder secondary are “Not Configured.” If either of these is configured, then this is a finding.