WDNS-CM-000017 - In a split DNS configuration, where separate name servers are used between the external and internal networks, the external name server must be configured to not be reachable from inside resolvers.

Information

Instead of having the same set of authoritative name servers serve different types of clients, an enterprise could have two different sets of authoritative name servers.

One set, called external name servers, can be located within a DMZ; these would be the only name servers that are accessible to external clients and would serve RRs pertaining to hosts with public services (web servers that serve external web pages or provide B2C services, mail servers, etc.).

The other set, called internal name servers, is to be located within the firewall and should be configured so they are not reachable from outside and hence provide naming services exclusively to internal clients.

NOTE: Nessus has not performed this check. Please review the benchmark to ensure target compliance.

Solution

Configure the external DNS server's firewall policy, or the network firewall, to block queries from internal hosts.

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_MS_Windows_2012_Server_DNS_V2R4_STIG.zip

Item Details

References: CAT|II, CCI|CCI-000366, Rule-ID|SV-215586r804964_rule, STIG-ID|WDNS-CM-000017, STIG-Legacy|SV-73035, STIG-Legacy|V-58605, Vuln-ID|V-215586

Plugin: Windows

Control ID: 10fb25b2871d828b02c2032a81536496ead804d71ce4c5f9e2b91cbef2532f2c