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Network Security Pen-Test
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Re: VoIP pentest ?

Subject: Re: VoIP pentest ?
Date: Thu, 28 Oct 2004 17:32:20 +0200
Greetings!

On Wed, 27 Oct 2004 11:28:51 +0200 Frederic Charpentier
<fcharpen@xmcopartners.com> wrote:
does anyone have experiences or papers on VoIP pentest/assessment ?
Expecting classic OS/Network audits and H323/ASN.1 flaws, I can't find
any documentations or papers about flaws in VoIP architecture.

VoIP (SIP and H.323) do media transfer via (unencrypted) RTP/RTCP.
SIP is a simple, unauthenticated cleartext protocol. H.323 similar
(binary and more complex, but still unauthenticated). 

With ARPspoofing etc. it is simple to listen to voice streams or call
setup - or change it. So re-routing voice streams or calls should be
simple.

Quite a high percentage of systems were/are susceptible to buffer
overflows it seems (forgot the URL - about half a year ago). 

For other fun with SIP see e.g.
http://www.infoanarchy.org/story/2004/9/15/23127/3363

Bye

Volker Tanger
ITK Security

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