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Re: IP Telephony pen-test and VLAN's
From: Chris Serafin <chris () chrisserafin com>
Date: Wed, 17 May 2006 21:55:31 -0500

Well this is how I would start:

  * Most likely the Cisco Call Manager's AND Unity are on a windows
    platform, as Linux support is not out till 5.0, which I can't even
    get.
  * The 'supported' platform is windows 2000, and it will most likely
    be a win2000 box, so all the usual Windows 2000 exploits should
    work hopefully
  * The default location for Cisco CM web admin is :
    https://ipaddress/ccmadmin/
  * The default login/pass is : ccmadministrator/cisco
* Check if RDP and VNC is available, the prolly will be...remember a realVNC exploit was just released, check metasploit.
  * Use VLAN hopping to get on the voice VLAN
  * Possibly use CDP packets to get your QoS DSCP markings through
  * Check the router/gateway and the switches for 'r00ting' them via
    old http exploits or mainly SNMP hacking
  * Sniff traffic for 'chatty' cisco protocols that give a bunch of
    info for enumeration/recon
  * Sniff VoIP RTP in windows with ethereal or Cain&Able
  * Sniff VoIP RTP in Linux via ethereal or VOMIT
  * Use routing protocols for recon or for re-routing
  * the normal arp spoofing for MITM


well that's just a start..........

I work exclusively in the Cisco IPT industry and I come from a security background so I would love to chat about this with you/the community:)

Chris Serafin
IT Security / Cisco VoIP Engineer
chris () chrisserafin[dot]com





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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