Harry Waldron - Corporate IT Security

Steve Friedl, Microsoft MVP, has developed this EXCELLENT guide which illustrates in detail how the new DSN exploits can impact unpatched servers.      

An Illustrated Guide to the Kaminsky DNS Vulnerability
http://www.unixwiz.net/techtips/iguide-kaminsky-dns-vuln.html

QUOTE: This paper covers how DNS works: first at a high level, then by picking apart an individual packet exchange field by field. Next, we'll use this knowledge to see how weaknesses in common implementations can lead to cache poisoning. By fully understanding the issues at play, the reader may be better equipped to mitigate the risks in his or her own environment. We hope everybody who runs a DNS server patches soon.