"Whether you're running Linux, Windows, Cisco, Sun, or other DNS
servers, you are at risk from a newly discovered vulnerability. So
says Dan Kaminsky, head of penetration testing research at IO
Active, who accidently discovered the DNS 'design flaw' earlier
this year.
"You can check whether the DNS servers you use are vulnerable by
clicking the Check My DNS button in the upper right corner of
Kaminsky's Web site..."