Date: Wed Apr 12 18:34:32 2006
From: arley.leal at sonae.com (Arley Barros Leal)
Subject: RE: info on ip spoofing please

My 2 cents...

Using ARP Cache Poisoning can actually force traffic to flow trough your host, 
The man may get into the middle at any time in this scenario :-) ARP Cache 
Poisoning/CAM Floodind/DHCP,BOOTP Spoofing is old school, but some, still very 
effective on most of today's networks. You may wish to play around with 
Cain&Able, dsniff, hunt etc..

Some not so old attacks explore protocols like STP/VTP/DTP/HSRP. One may use 
Vlan hoping/jumping attacks to trunk traffic from different VLANs, this will 
let the attacker sniff traffic from remote broadcast domains as far as they 
participate on the same VTP domain.

Cheers..


-----Original Message-----
From: full-disclosure-bounces@...ts.grok.org.uk 
[mailto:full-disclosure-bounces@...ts.grok.org.uk] On Behalf Of Neil Davis
Sent: quarta-feira, 12 de Abril de 2006 16:42
To: full-disclosure@...ts.grok.org.uk
Subject: [Full-disclosure] RE: info on ip spoofing please

>   Hello all,
> At
> http://www.iss.net/security_center/advice/Underground/Hacking/Methods/
> Technical/Spoofing/default.htm
>
> was this comment :-
>
> QUOTE "
> Examples of spoofing:
>
> man-in-the-middle
> packet sniffs on link between the two end points, and can therefore
> pretend to be one end of the connection "
>
> My question is How can you sniff packets on a link that your machine
> is NOT on ie NOT on the same subnet??
>
> Why am I at a loss to understand this. Is there a command/software
> that allows one to
> say: sniff packets on port x of IP xxx.xxx.xxx.xxx ?
>
> Please put me out of my agony on this.
> Thanks for any info you can give.
>
>
> Ian t
I think you misread the information, this part of it to be exact:
Examples of spoofing:

man-in-the-middle
packet sniffs ____on link between the two end points____, and can therefore 
pretend to be one end of the connection "

The answer to your question is you can't.

You can only do this on a machine that the traffic is flowing through.
Hence the name, "man-in-the-middle".

You need to comprimise a machine between the endpoints, such as a firewall, 
router, or proxy, or one of the endpoints themselves so you can sourceroute 
through a machine of your choosing (though if you have comprimised an 
endpoint, this isn't necessary). You then run ettercap, and can even read 
their SSL/SSH conversations and change data.
man-in-the-middle is a wicked attack. It's also fairly difficult to get there, 
if the machines concerned are patched, up to date, and securely configured, as 
so often they are not.

On ms proxy server, all you need to do is comprimise the proxy server.
The session ID's, if on query string, are logged, even when they are via ssl, 
you can easily hijack a session that way, simply by looking at the proxy log's 
recent entries, in a lot of cases (note: I am not sure if ms proxy server does 
this on more recent versions, and I am sure it's possible to turn this logging 
off). No packet analysis necessary.

-Viz

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