TLD servers with recursion was Re: Exploit for DNS Cache Poisoning - RELEASED

John Kristoff jtk at centergate.net
Thu Jul 24 08:43:04 CDT 2008


On Thu, 24 Jul 2008 10:06:25 +0100
Simon Waters <simonw at zynet.net> wrote:

> I checked last night, and noticed TLD servers for .VA and .MUSEUM are
> still offering recursion amongst a load of less popular top level
> domains.
> 
> Indeed just under 10% of the authoritative name servers mentioned in
> the root zone file still offer recursion.

While not ideal, at least most resolvers will not go asking those
servers for anything other than what they are authoritative for unless
an attacker for some reason wanted to setup a long chain of poisons. The
large, shared caching servers and all those open CPE devices are a
much larger concern I think.

John




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