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Assessment Title
Rule Text
The Infoblox DNS service member must use current and valid root DNS service members.
Description
Discussion Text
All caching name servers must be authoritative for the root zone because, without this starting point, they would have no knowledge of the DNS infrastructure and thus would be unable to respond to any queries.
An adversary could change the root hints and direct the caching name server to a bogus root server. At that point, every query response from that name server is suspect, which would give the adversary substantial control over the network communication of the name servers' clients.
When authoritative servers are sent queries for zones for which they are not authoritative, and configured as a noncaching server (as recommended), they can either be configured to return a referral to the root servers or to refuse to answer the query. The recommendation is to configure authoritative servers to refuse to answer queries for any zones for which they are not authoritative. This is more efficient for the server and allows it to spend more of its resources serving its intended purpose: answering authoritatively for its zone.
An adversary could change the root hints and direct the caching name server to a bogus root server. At that point, every query response from that name server is suspect, which would give the adversary substantial control over the network communication of the name servers' clients.
When authoritative servers are sent queries for zones for which they are not authoritative, and configured as a noncaching server (as recommended), they can either be configured to return a referral to the root servers or to refuse to answer the query. The recommendation is to configure authoritative servers to refuse to answer queries for any zones for which they are not authoritative. This is more efficient for the server and allows it to spend more of its resources serving its intended purpose: answering authoritatively for its zone.
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