RE: Using a Compromised Router to Capture Network Traffic

From: Moffett, Ryan (Ryan_Moffettat_private)
Date: Mon Jul 15 2002 - 10:05:21 PDT

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    Is this hosted on an alternate site other than the geocities site which has
    exceeded the xfer limit?
    
    -----Original Message-----
    From: Penetration Testing [mailto:pentestat_private] 
    Sent: Monday, July 15, 2002 2:44 PM
    To: pen-testat_private
    Subject: Using a Compromised Router to Capture Network Traffic
    
    
    Hi all.
    
    I have recently completed some experimentation into using a captured router
    to sniff network traffic on a remote network.  This is in the same vein as
    Gauis' article in Phrack 56 (Things to do in cisco land when you are dead).
    
    I have tried to build on Gauis' work in that I terminated the GRE tunnel on
    a Cisco router instead of a *nix machine.  I explored a couple of possible
    scenarios for this, the net result being that it is possible to remotely
    capture (bi-directional) network traffic using NO customised tools; all that
    is required is one cisco router with vanilla IOS, and a machine that can run
    snoop or tcpdump.
    
    Anyway, if anyone is interested, the document describing the experiment and
    results is available at http://www.geocities.com/david_taylor_au/
    (Word 2000 format).  Or, contact me.
    
    Regards,
    Dave Taylor
    
    
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