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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.

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UDP packets with source port of 53 bypass firewall rules

Vulnerability Assessment Summary By-passes the remote firewall rules Detailed Explanation for this Vulnerability Assessment It is possible to by-pass the rules of the remote firewall by sending UDP packets with a source port equal to 53. A possible hacker may use this flaw to inject UDP packets to the remote hosts, in spite of the existence of a firewall. Solution : Review your firewall rules policy Network Security Threat Level: High Networks Security ID: 7436, 11237 Vulnerability Assessment Copyright: This script is Copyright (C) 2003 Tenable Network Security

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