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Forwarders are not disabled on the CSS DNS.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-4510 | DNS0925 | SV-4510r1_rule | ECSC-1 | Medium |
| Description |
|---|
| 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. |
| STIG | Date |
|---|---|
| CISCO CSS DNS | 2015-12-29 |
Details
| 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). |