Roughly ten percent of the Internet’s DNS servers are still vulnerable to a cache poisoning attack that was revealed months ago, according to a worldwide survey of public-facing Internet nameservers. “We estimate there’s 11.9 million nameservers out there, and over 40% allow open recursion, so they accept queries from anyone,” DNS expert Cricket Liu tells Computer World. “Of those, a quarter are not patched,” he says. “So there’s 1.3 million nameservers that are trivially vulnerable.”
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