In a rare show of cooperative effort, multiple vendors released a patch today to their DNS implementations, the underlying technology behind connecting domain names to the IP addresses they live on. DNS Admins are urged to patch the systems in their charge, immediately . Securosis has the full story. Here’s a tool to test to see if you’re at risk to the Cache Poisoning exploit.

Interestingly enough, only one DNS implementation was not affected: DJBDNS.