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RE: Wired captive portal pen-test
From: "Sergio Castro" <sergio.castro () unicin net>
Date: Mon, 14 Jul 2008 14:38:23 -0500

So yes, if you only see broadcast ARP requests from the router, the switch
is very likely securely configured.

Did you try using Cain? You may be able to do ARP poisoning with it and
intercept traffic between the router and IPs in your same subdomain.

- Sergio

-----Mensaje original-----
De: Roman Medina-Heigl Hernandez [mailto:roman () rs-labs com] 
Enviado el: Lunes, 14 de Julio de 2008 02:34 p.m.
Para: Sergio Castro
CC: pen-test () securityfocus com
Asunto: Re: Wired captive portal pen-test

Sergio Castro escribió:
I've done similar voipsec audits at hotels. The hotel is very likely 
using a switch-router (and very likely VLANs) so you will not be able 
to see any other IPs on the network. What is your sniffer showing?

I saw ARP requests coming from the router and asking for the MAC of several
other IPs of the same segment where my laptop was connected (in my case,
192.168.9.x). I didn't catch any ARP responses...

Another probe I did was walking to a "public computer" in the hotel (some
kind of internet-kiosk) and get the IP. The IP was in the same 192.168.9.x
range. I didn't have time to get its MAC and try to configure my laptop's
NIC with that MAC (although the switch should probably stop that... 
shouldn't it?).

Another possible attack vector you may use is their IP phones. If the 
room has an IP phone, try connecting your laptop to the phone's RJ45 
and do a packet sniff. I've been able to access entire corporate LANs
doing this.

I didn't have a look at this... although I'd guess it was rj-11... Next time
I'll check it! :)

-- 

Saludos,
-Roman

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Available at KeyServ]

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