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1 Out Of 10 DNS Servers Is Still Vulnerable

Posted on November 11th, 2008 by admin in Domain News | 1 Comment »

More than 10 percent of the Internet’s DNS (Domain Name System) servers are still vulnerable to cache-poisoning attacks, according to a worldwide survey of public-facing Internet nameservers.

That’s despite it being several months since the vulnerabilities were disclosed and fixes made available, said DNS expert Cricket Liu, whose company, Infoblox, commissioned the annual survey.

“We estimate there’s 11.9 million nameservers out there, and over 40 percent allow open recursion, so they accept queries from anyone. Of those, a quarter are not patched. So there’s 1.3 million nameservers that are trivially vulnerable,” said Liu, who is Infoblox’s vice president of architecture.

Other DNS servers may well allow recursion, but are not open to everyone, so they were not picked up by the survey, he said.

Liu said the cache-poisoning vulnerability, which is often named after Dan Kaminsky, the security researcher who published details of it in July, is genuine: “Kaminsky was exploited within days of being made public,” he said.

To read the rest of this story, go here.

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