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Vonage No need to alter the MAC, far more useful (if not as immediate) to get the config




No need to alter the MAC, far more useful (if not as immediate) to get the config file, decrypt it, take the SIP credentials & run with it.


Other than downloading the encrypted config file, I don't know of any way off the top of my head. If you have some access to the same subnet as the victim, you might be able to do some router table poisoning upstream of you and sniff out some SIP traffic from there. The traffic method would give you the phone#/userID and servers immediately, but you'd have to do some cracking (which takes time, it's a long password) to obtain the password.



All of the Vonage adapters use very similar config files with similar encryption. The steps to break the config files for the Sipura-based devices is only slightly different than for the TI-based devices.

Ultimately, this type of attack is nearly useless to find a specific person's account and hijack it, but if you're looking for a free random Voip line, then it can be done. I should note, that if someone obtains the SIP credentials for your account, they CAN get your incoming calls. If you have hit-or-miss incoming calls, then that may be a sign that something is amiss.

As far as why they singled out these routers specifically, maybe they've found a backdoor in the linux side of things. OR, since it's linux, maybe they've come up with a quick script that'd reprogram the adapter to give you a place to enter your MAC address rather than use the device's own. Then you might be able to get the decryption password directly rather than spending some serious time cracking it.

You have to keep things in perspective 'though. It's FAR easier to go after analog phone lines. Just hop out of your car, hook on with 2 alligator clips, and you're in.



Read The Full Thread:

VoIP hijacking possibility


Partial excerpt from ABC news:
ahmagad... so Scary... wat can a custOmer do on their part? NADA? :( i
We've touched on the questionable choice Vonage/Linksys (actually Sipura/Motorola
What is a customer's risk? The highest risk comes to businesses who would
Here is the abstract of Arias Hung's talk: http://www.defcon.org/html/defcon-14/dc-14-speakers.ht
Other than the fact that this was talked about at Defcon, this really isn't news.
Ethereal and Cain require you to have access to the target's network. Ethereal
I was hoping to discuss this matter without posting a virtual "how-to-guide"
Therefore, the basic questions remain. If I have one of these Linksys devices

VonageTPA posted "No need to alter the MAC, far more useful (if not as immediate) to get the config" on 08/09/2006

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