By Tim Wilson
Nov 10, 2008
More than six months after the discovery of security flaws in the
Internet's core addressing system, many Domain Name System (DNS) servers
are still open to attack, according to a study published today.
According to a report on DNS trends published by Infoblox and the
Measurement Factory, approximately one in four DNS servers still does
not perform source port randomization, the chief patch for the so-called
"Kaminsky vulnerability" that was discovered by researcher Dan Kaminsky
in the first half of last year and fully disclosed at the Black Hat
conference in August.
"A surprising number have not been upgraded and are very vulnerable to
cache poisoning," the report states.
The study, which took a sample of 5 percent of the Internet's IPv4
address space -- about 80 million addresses -- also showed that more
than 40 percent of Internet name servers allow recursive queries, which
is one of the design flaws that might enable attackers to abuse Internet
address spaces for their own purposes. About 30 percent allow zone
transfers to arbitrary requestors, another flaw that could lead to
vulnerabilities such as those discovered by Kaminsky.
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