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Assessment Title
Rule Text
The Windows DNS Server must restrict incoming dynamic update requests to known clients.
Description
Discussion Text
Limiting the number of concurrent sessions reduces the risk of denial of service (DoS) on any system.
A DNS server's function requires it to be able to handle multiple sessions at a time, so limiting concurrent sessions could impact availability.
Primary name servers must be configured to limit the actual hosts from which they will accept dynamic updates and zone transfer requests, and all name servers should be configured to limit the hosts from/to which they receive/send zone transfers. Restricting sessions to known hosts will mitigate the DoS vulnerability.
A DNS server's function requires it to be able to handle multiple sessions at a time, so limiting concurrent sessions could impact availability.
Primary name servers must be configured to limit the actual hosts from which they will accept dynamic updates and zone transfer requests, and all name servers should be configured to limit the hosts from/to which they receive/send zone transfers. Restricting sessions to known hosts will mitigate the DoS vulnerability.
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