Vulnerability opens gate through firewalls

Network administrators beware: A quirk of the Web's addressing and name system can be turned with little difficulty into a way for attackers to tunnel behind firewalls, piggybacking on surfer's Web browsers. Speaking at this year's Chaos Communication Camp (and echoing talks given several times over the past few weeks), he focused on a vulnerability in Web browsers and common applications such as Flash, newly discovered, but drawing on a problem first outlined by Princeton researchers in 1996.

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