Re: IP Telephony pen-test and VLAN's

[Sn0rkY <securityone () free fr>]

Hello hello,

to access to the vlan voice, you must add the module 8021q on your linux 
box, after use the tool "vconfig" to add a virtual interface tagged with 
the ID 124

# modprobe 8021q
# vconfig add eth0 124

next request an IP with DHCP and specify your interface eth0.124
# pump eth0.124

on the windows box some card "intel PRO/100 VE and broadcom" can be 
configured for vlan access:
http://www.lanarchitect.net/Articles/VLANTrunking/Implementation/

Now you have an interface in the vlan 124 "eth0.124" and you can use 
some tools for exemple you can performed ARP MITM with ettercap

# ettercap - eth0.124

Health & Happiness :)
Sn0rkY

Frank Bussink wrote:
> Hello,
>
> I'm trying to do a pen-test on a Cisco IPT system.
>
> Cisco IP telephone are connected on the same network cable as the PC, but
> are working on another vlan.
> The access switches have a configuration like :
> switchport mode access
> switchport access vlan 123
> switchport voice vlan 124
>
> I think the negotation with the access switch is done by CDP but I'm not 
> sure.
>
> Does anyone have a tool that emulates the PC as a voice device in order 
> to receive a dhcp lease on vlan 124, so I can start to inject ARP MITM 
> with Cain for example ?
>
> Kind regards
> Frank
>
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This List Sponsored by: Cenzic

Concerned about Web Application Security? 
Why not go with the #1 solution - Cenzic, the only one to win the Analyst's 
Choice Award from eWeek. As attacks through web applications continue to rise, 
you need to proactively protect your applications from hackers. Cenzic has the 
most comprehensive solutions to meet your application security penetration 
testing and vulnerability management needs. You have an option to go with a 
managed service (Cenzic ClickToSecure) or an enterprise software 
(Cenzic Hailstorm). Download FREE whitepaper on how a managed service can 
help you: http://www.cenzic.com/news_events/wpappsec.php 
And, now for a limited time we can do a FREE audit for you to confirm your 
results from other product. Contact us at request () cenzic com for details.
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