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Vonage I was hoping to discuss this matter without posting a virtual "how-to-guide"





I was hoping to discuss this matter without posting a virtual "how-to-guide" for Vonage, so I'll try to keep the details as minimal as necessary for the argument. In this case, you are partially correct. As long as you have absolutely NO access to the victim's network, you will have a difficult time using Ethereal. Cain can still prove useful for decoding/decrypting passwords 'though. Also, through router poisoning, you can snag some pretty interesting stuff. The chances of going after a specific user via the traditional packet sniffing techniques without being on the same subnet/network as them is probably remote. BUT, once you have some info, then Cain becomes useful.



Yes & no... I can say with 100% confidence that having the correct MAC address is NOT required to use the Vonage service. The configuration (provisioning) filenames actually have the MAC address in them, which is the only way/reason that the MAC address is even part of the issue. The provisioning files are how Vonage controls the ATAs and how they make changes to them, from making sure it has the correct phone #, to changing ringtones & volume levels. Useful, but they actually don't do anything special. Think of it like using DHCP vs. static IPs. The config file is similar to DHCP, entering the SIP credentials manually is similar to how you configure static IPs. Once you've gotten a MAC address, you can download the config file from Vonage's server, and with some time & patience, break the encryption on the file and extract the full SIP credentials (username, password, proxy servers, ports, SIP-specific settings, dial-plans, and other things). Then you can use any SIP-compatible device you like with Vonage's service, without using the SoftPhone option. In fact, the real high-level Vonage techs will sometimes do troubleshooting on adapter-specific problems by taking the info from the decrypted config file and enter it into a standard non-Vonage-specific SIP device.

Where this is scary is that there's nothing stopping someone from going into a big box retailer with a camera phone, taking pictures of a few Vonage boxes (Linksys has a habit of putting the serial # & MAC address on the outside of the box) and I'll stop there so I'm not giving a how-to guide.



I've seen what you're asking about, but I'm not about to post it in a public forum. All that I will comment on is that the encryption key is different for each unit AND it can be changed remotely.



The RTP300/WRTP54G both run on linux and people have pretty much picked apart entire firmware versions down to the core and learned many things about them. You can feed an RTP300 a bogus config file by faking the config file server and it'll happily accept it. As far as consumers avoiding these devices, I'm not 100% sure why they'd reccomend that action, but we already know the routing portion of these devices is barely functional to begin with.



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
Therefore, the basic questions remain. If I have one of these Linksys devices
No need to alter the MAC, far more useful (if not as immediate) to get the config

VonageTPA posted "I was hoping to discuss this matter without posting a virtual "how-to-guide"" on 08/09/2006

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