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Vulnerability Assessment & Network Security Forums |
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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery. Home >> Browse Vulnerability Assessment Database >> General >> DNS Server on UDP and TCP Vulnerability Assessment Details
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DNS Server on UDP and TCP |
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Checks if the remote DNS servers answers on TCP too Detailed Explanation for this Vulnerability Assessment A DNS server is running on this port but it only answers to UDP requests. This means that TCP requests are blocked by a firewall. This configuration is not RFC-compliant. Contrary to common belief, TCP transport is not restricted to zone transfers (AXFR) : - answers bigger than 512 bytes are always transmitted over TCP. - for all other requests, UDP is only 'preferred' for performance reasons. i.e. RFC1035 (STD0013) does not forbid a DNS client from issuing its queries directly over TCP. ** If you are sure that your DNS server will never return ** answers bigger than 512 bytes and that the client ** software prefers UDP (which is nearly certain), you may ** disregard this message. Read RFC1035 (STD0013) for more information. Network Security Threat Level: None Networks Security ID: Vulnerability Assessment Copyright: This script is Copyright (C) 2005 Michel Arboi |
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