Re: IP Telephony pen-test and VLAN's

Conducting a security assessment on a Cisco IPT system, one could potentially use one of the commercially or non-commercial port scanners available, but the real security assessment is the configuration. Most of the IP telephony systems are highly susceptible to a Ddos attack as mentioned in several books that have been published recently, but again this is not the real deliverable one would want to deliver to the senior exec staff. Informing them that the current configuration allows for toll-fraud, call redirects, outbound forwarding, call routing mishaps would be more interesting, since toll-fraud may be small potatoes in a security pen-testers mind since "being ownzed" or "r00ting" a system is more popular, but informing a senior exec staff person that a internal or external person can make unlimited calls from anywhere on the universe through the IPT system will make them go out and hire a Phd in Biology as their CSO who has been known to wear camouflage pants and oogle all the well-endowed women in the organization.. Oops, am I speaking as if this really happenned, maybe it did at an organization near you..

-----Original Message-----
From: Frank Bussink <frank_bussink@xxxxxxxxxxx>
Sent: May 16, 2006 2:28 AM
To: pen-test@xxxxxxxxxxxxxxxxx
Subject: IP Telephony pen-test and VLAN's

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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