bugtraq - Re: Lingo VoIP ATA / UTStarcom iAN-02EX remote access vulnerability

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Message-ID: <20050309192507.77363.qmail@smasher.org>
Date: Wed, 9 Mar 2005 14:26:57 -0500 (EST)
From: Atom Smasher <atom@...sher.org>
To: BugTraq@...urityfocus.com
Subject: Re: Lingo VoIP ATA / UTStarcom iAN-02EX remote access vulnerability

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thinking out loud....

1) does the ATA connect to the server by resolving a hostname?

2) how do the ATA and server authenticate each other? is there any 
authentication?

3) is traffic between the ATA and server encrypted? how is key-exchange 
handled?

part of the ATA configuration allows one to select DNS servers. this is 
normally done via DHCP, but may be entered manually. it may be possible 
for an attacker to change the DNS servers (to point to compromised DNS 
servers), become the "VoIP service provider" and intercept phone calls. 
this is, of course, a version of the man in the middle attack. depending 
on what (if any) authentication and/or encryption is done between the ATA 
and the server this may well be practical in the real-world.

if anyone has access to one of these ATAs (or similar) and some time do to 
any packet sniffing and traffic analysis i'm sure we'd all be curious what 
you find...

references:
http://securityfocus.com/archive/1/392628/2005-03-06/2005-03-12/1

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