Penetration Testing mailing list archives

Re: bypassing employer's proxy to surf anonymously


From: jm <jm () hcn com au>
Date: Thu, 15 Jun 2006 15:22:23 +1000

This mentions an internal server that allows recursion. This is quite often not the case. And even if it does, its the NS that does the recursion, not the local resolver.

gimeshell () web de wrote:

On Tue, 13 Jun 2006 10:47:52 +0100
Hubert Seiwert <hubert () westpoint ltd uk> wrote:

Another method of tunneling would be through DNS. You say that dns
traffic is blocked
on the server, but as long as there is a DNS server on the internal
network that will do
recursive resolving for you it's possible. You can use Dan Kaminsky's
OzymanDNS scripts

Now i know surely 'udp src port 53' and 'udp dst port 53' are blocked.

But now my question:

How should it be possible for any internal DNS server to do recursive
resolving and get outside from internal network if dns traffic is
blocked and the only official/known dns resolving is done by proxy?

I didn't take a deeper look at these scripts yet, but i will do.
Perhaps i get all answers then but perhaps you can say, it isn't
possible to use these scripts under these given circumstances, in the
first place.

regards,
gimshell

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