Bind 8 DNS binned

Bind 8 DNS binned
Bind 8 DNS binned 

By Jeremy Kirk
IDG news service
05 September 2007

A security researcher has found a serious vulnerability in Bind 8 
forcing the software's maintainers to issue an advisory for users to 
upgrade to Bind 9.4, the latest version.

The flaw within Bind 8 software could misdirect users to a fraudulent 
wedsite even if a user typed in the correct URL wrote Amit Klein, chief 
technology officer for security vendor Trusteer. Klein discovered the 

Users are being advised to upgrade to Bind 9.4, the latest version of 
the software, which underwent an architecture rewrite to improve 
security. The software, looked after by the Internet Software Consortium 
(ISC), is free to download.

ISC issued an interim patch, but due to other weaknesses in the 
software, ISC is also ending support for Bind 8.

"It's never easy to retire a product," wrote wrote ISC in an advisory. 
"The security issues of Bind 8 are many, and seven years after the 
release of Bind 9, ISC must devote our efforts to maintaining and 
enhancing the current version."

About 14 percent of the DNS servers on the Internet in 2006 were still 
using Bind 8, according to Infoblox Inc., which conducts an annual 
survey of DNS servers.

"Bind 8 is still a very popular DNS server nowadays, thus this attack 
applies to a big part of Internet users," Klein wrote.

In a research paper, Klein described a weakness in the algorithm Bind 8 
uses to generate transaction IDs, apparently random serial numbers that 
allow it to spot whether someone is trying to supply it with false 
information in respose to queries. The weakness makes it possible to 
observe a few queries and then predict the transaction ID in the 
sequence, Klein wrote.

Using that information, an attacker can then send erroneous information 
to the DNS server, "poisoning" the address stored against a particular 
domain name in its memory cache. Thus, traffic intended for a certain 
Web site from users of that DNS server can be diverted to another server 
containing a fraudulent site, a deception known as "pharming."

Although Bind 9 has a better transaction ID algorithm, it could also be 
vulnerable, Klein wrote.

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