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Assessment Title
Rule Text
The Infoblox DNS service member must send outgoing DNS messages from a random port.
Description
Discussion Text
OS configuration practices as issued by the U.S. Computer Emergency Response Team (US CERT) and the National Institute of Standards and Technology's (NIST's) National Vulnerability Database (NVD), based on identified vulnerabilities that pertain to the application profile into which the name server software fits, must always be followed.
In particular, hosts that run the name server software should not provide any other services, and therefore, should be configured to respond to DNS traffic only. In other words, the only allowed incoming ports/protocols to these hosts should be 53/udp and 53/tcp.
Outgoing DNS messages must be sent from a random port to minimize the risk of an attacker guessing the outgoing message port and sending forged replies.
In particular, hosts that run the name server software should not provide any other services, and therefore, should be configured to respond to DNS traffic only. In other words, the only allowed incoming ports/protocols to these hosts should be 53/udp and 53/tcp.
Outgoing DNS messages must be sent from a random port to minimize the risk of an attacker guessing the outgoing message port and sending forged replies.
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