[36648] in bugtraq
Re: ICMP spoofed source tunneling
daemon@ATHENA.MIT.EDU (Tim Newsham)
Fri Sep 24 01:35:05 2004
Date: Wed, 22 Sep 2004 10:06:40 -1000 (HST)
From: Tim Newsham <newsham@lava.net>
To: fenfire@abwesend.de
Cc: bugtraq@securityfocus.com
In-Reply-To: <20040922103350.GA7688@nenya.lan>
Message-ID: <Pine.BSI.4.58.0409221004360.23430@malasada.lava.net>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
> On Tue, Sep 21, 2004 at 08:55:04PM +0400, Max Tulyev wrote:
> > Let's imagine in Net a hacker having his source server(S), destination
> > server(D), and a ip-capable device - victim(V). S sends to V spoofed ICMP
> > echo request packet containing IP source address of D, and the data in
> > Payload.
> >
> > When V receiving that packet, it sends ICMP echo-reply packet to D, AND
> > FORWARDS TO D ALL DATA IN PAYLOAD!
>
> This could also be used by peer-to-peer networks to achieve sender
> anonymity. (Of course you could also directly send UDP packets with forged
> source addresses...)
How does this give anonymity? When sending to the server, I must
use the servers address as a source address. When the server replies
to me, it must use my address as a source address. Maybe the two
addresses dont appear in the same packet at the same time, but they're
there. This might fool a few people when used a few times, but it
will hardly fool everyone when it is in widespread use.
Tim N.
