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Forwarders are not disabled on the CSS DNS.


Finding ID Version Rule ID IA Controls Severity
V-4510 DNS0925 SV-4510r1_rule ECSC-1 Medium
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.
CISCO CSS DNS 2015-12-29


Check Text ( C-3423r1_chk )
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.
Fix Text (F-4395r1_fix)
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).