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Red Alert! DNS Flaw Revealed

By Roger Andrews, Posted on July 31, 2008 at 4:24 pm

Due to the recent online disclosure of technical details to exploit a widespread DNS vulnerability, security researchers are warning users to patch vulnerable systems immediately.

All Linux and Windows based DNS servers require a patch, and most routers need a patch with real urgency.


The domain name system translates domain names, like "," into numeric IP addresses and vice versa. The DNS flaw, if exploited, allows what is known as DNS cache poisoning. This involves remapping domain names to different, potentially malicious servers.

US-CERT on Monday warned: "Technical details regarding this vulnerability have been posted to public Web sites. Attackers could use these details to construct exploit code. Users are encouraged to patch vulnerable systems immediately."

"This is a very serious situation, and can possibly lead to widespread and targeted attacks which hijack sensitive information by redirecting legitimate traffic to fraudulent Web sites, due to incorrect (fraudulent) information being injected into the vulnerable caching nameserver(s)," Trend Micro security researcher Paul Ferguson said in a blog post.

Read the full article:

For additional information about this type of attack and for details about how to resolve it, visit

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