OSEC

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Re: attack on a computer behind a nat.

From: Shreyas Zare (shreyastechnitium.com)
Date: Thu Sep 11 2008 - 07:58:43 CDT

Hi,

Thats precisely Simple Traversal of UDP through NAT (STUN) protocol. I
believe that only UDP can be exploited with some success and TCP will
be almost impossible unless you compromise the NAT box itself.

Regards,

On Wed, Sep 10, 2008 at 2:53 PM, David Howe
<DaveHowe.Pentestgooglemail.com> wrote:
>
> Mark Owen wrote:
> > Only problem with that is the firewall/router/nat won't be expecting a
> > result from your IP address and will drop it as it would have no idea
> > what computer behind the nat to forward it to. If there is no
> > underlying session, there is no communication.
>
> Most nats, particularly for udp, aren't that smart. they will accept a
> packet "to" the natted outside IP+port and forward it to the internal
> host. There are nat2nat session proxy servers that take advantage of
> that - they accept two connections (from a:aport and b:bport) and tell
> "a" to connect to b:bport and "b" to connect to a:aport. Mostly, this works.
>
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--
("There are only 10 kinds of people in this world: those who know
binary and those who don't.")

Shreyas Zare
Co-Founder, Technitium
eMail: shreyastechnitium.com

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