Re: Tools for voicemail testing?

  Hi,

I have some custom tools (hardware and software) I use in voice-mail audits. It allows
to automate pretty much any dialogue with voice mail systems. You capture audio samples
from the target voice mail system and then write a Perl script using external library which
implements function such as audio pattern recognition.

For example, algorithms similar to one below (I do not have access to the original veresion
right now) was tested on several voice mail systems and gave very impressive results -- full
keyspace search (4 digits) in 15 hours. Apparently, it is much faster than most people think
is possible ;).

   hangup
   dial $voicemail_number

   wait_for "voicemail_prompt.pat"
   send dmtf "*"

  for(;;) {
    $pin = get_new_pin_from_dictionary()

    wait for "enter_your_pin_code.pat"
    send dtmf $pin

    $answer = wait for "invalid_pin.pat", "hangup.pat"
    last if $answer eq "hangup.pat"
    next if $answer eq "invalid_pin.pat"

    print "Suspicious pin code '$pin\n"
    last;
  }
}

Do you need help?

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Similar techniques can be used to automatically traverse through voice mail menu tree, sending strange sequences of DTMF (or some other) tones to the system and analyse responce.

I have developed it for in-house use. We do not give it away for free, but it is not a commercial-grade
software either. If you are interested, contact me and we can discuss licensing terms.

--

Alexandre Bezroutchko
Scanit n.v., Belgium
http://www.scanit.be/

• Original Message -------- Subject: Tools for voicemail testing? Date: Sun, 1 Jun 2003 23:26:56 -0700 (PDT) From: "Todd A. Jacobs" <tjacobs-keyword-ptest01.f946df@codegnome.org> To: pen-test@securityfocus.com

I've been Googling for about four hours tonight, and haven't been able to turn up any current tools for performing brute-force attacks on voicemail boxes. Does anyone know of any FOSS or commercial tools for performing this sort of test?

--

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