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

[Ryan Cummings <ryan.r.cummings () gmail com>]

Lingo only uses UDP ports 5060-5065, 1020-1030, 10000-20000.  You can
set your ATA device up behind a firewall/router just as long as your
forward these ports to it.  This will take care of the remote access
and still allow your normal VoIP service to work.  I'm away from home
right now but when I get back I'll take some time to analyze the
traffic it creates and report my findings.

Ryan


On Wed, 9 Mar 2005 14:26:57 -0500 (EST), Atom Smasher <atom () smasher org> wrote:
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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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