bugtraq - Re: ICMP spoofed source tunneling

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Date: Wed, 22 Sep 2004 15:24:02 -0400
From: Dave Paris <dparis@...orks.com>
To: Max Tulyev <maxtul@...an.parkline.ru>
Cc: bugtraq@...urityfocus.com
Subject: Re: ICMP spoofed source tunneling


At the risk of possibly sinking my foot firmly into my mouth, it appears
that you've implemented an unimplemented feature of LOKI2 (circa 1997).
ref: http://www.phrack.org/show.php?p=51&a=6

If you look in the source at the link referenced, specifically the 
help() function, you'll find:

%s dest\t-  redirect to another client [ UNIMPLIMENTED ]\n",

Nifty none-the-less.

Kind Regards,
-dsp

Max Tulyev wrote:

> ICMP spoofed source payload tunneling
> 
> I. ABSTRACT
> 
> Almost any device having IP stack with enabled ICMP can be used to 
> be a tunnel redirector.
> 
> II. DESCRIPTION
> 
> 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!
> 
> Backward is the same.
> 
> I spent an only hour to write working exploit attaching this to Linux
> tuntap
> device...
> 
> III. ANALYSIS
> 
> Where it can be used?
> 
> 1. Hacker have a victim traffic to that one cost lesser than to the World.
> That way Victim will pay for traffic with other hacker's server.
> 
> 2. Hacker have no access to the world at all, but have external server 
> (D). For Victim can be used any neighbour device (I tried IP phone - it
> works!) or even firewall or gateway! This can make a tunnel through a
> server with completely disabled IP forwarding at all.
> 
> Very high probability of their attacks is in ISPs that gives a free access
> to some networks (I know that situation exists in Ukraine - to UA Internet
> Exchange access often is free and/or at higher speed, and in home Ethernet
> networks almost all ISPs provides free access to their clients and local
> resources).
> 
> IV. DETECTION
> This can be detected by observing an anomally ICMP activity, and if you
> have more than one network interfaces - by presence of spoofed packets
> that can't be in certain interfaces. Or maybe by viewing your Internet
> bill ;-)
> 
> V. WORKAROUND
> 
> Turning On reverse-path filtering and other antispoofed 
> mechanisms. Limiting rates or even denying ICMP type 8 at all.
> 
> 
> 
> 
>