Bruteforcing SIP extensions with Metasploit

Hi, some time ago I published this post about VoIP information gathering with Metasploit. For a minimal pentesting process, a module capable of bruteforcing discovered extensions password is needed. So I have developed it, if you know SIPvicious suite this module provides sipcrack tool features.

Based on available SIP related modules I implemented SIP Digest Authentication algorithm and Msf::Auxiliary::AuthBrute mixin does the magic with possible user/password combinations. This picture shows an example of use in which extension 100 password is discovered (100).

Source code:

In case you use the module outside a LAN is strongly recommended to add you external IP address (option "EXTIP"), trying to avoid SIP and NAT problems.

Bye ;)

SIP INVITE attack with Metasploit

Some days ago my friend @pepeluxx wrote another post about INVITE attacks. He spoke about a @sinologic project which allows to everybody passing some security tests to SIP servers. Furthermore he also published a perl script to do the same task. So I implemented it on Metasploit because I think It could be really useful during a pentesting. It’s interesting because these attacks are really dangerous, normally, attackers try to call to expensive locations. This target numbers often have special charges and they make money with this. Here there are two well known examples: http://blog.sipvicious.org/2010/12/11-million-euro-loss-in-voip-fraud-and.html http://snapvoip.blogspot.com.es/2009/02/calls-to-cuba-and-voip-attacks.html I’m not going to deep in this vector because of being a well known (and old!!) one. Basically the attacker tries to make a call using a misconfigured PBX. This is allowed because SIP RFC says that an ...

ISO 27001: Inventario de los activos de información

Uno de los primeros pasos que debe seguir la entidad para adaptarse a la norma ISO 27001 es realizar el inventario de activos que contendrá todos aquellos activos de información que tienen algún valor para la organización y que quedan dentro del alcance del SGSI . En un principio puede parecer un poco abrumador para un principiante(como yo) por la enorme cantidad de activos que se te van ocurriendo por eso decidí empezar por clasificarlos de alguna forma, de entre las múltiples maneras que me encontré elijo la definida por los expertos del foro ISO27k ya que me parece la más completa, mostrando ejemplos de cada tipo y es válida para entidades de muy distinta naturaleza. Éste podría ser un buen punto para comenzar siempre teniendo en cuenta lo que nos aconsejan también en ese foro: "Debido a que los activos son algo cambiante, incluso si pudieras cubrir absolutamente todo lo que hay hoy, mañana la situación sería un poco diferente y más en unas semanas, meses o años. Así que ...

Flooding Asterisk, Freeswitch and Kamailio with Metasploit

Hi, it has been a long time since my last post because of my new job and my final year project ("VoIP denegation of service attacks" for curious) but there is something I found during my tests with Freeswitch , Kamailio and Asterisk that I want to share. NOTE: Really, guys of Security By Default blog published us (my good friend Roi Mallo and me) two articles about how to develop modules for Metasploit framework, another two are coming. ;) During my project, among others, I developed a Metasploit module which can flood SIP protocol with common frames (INVITE, OPTIONS, REGISTER, BYE), I wrote it at Quobis (nice job ;) in order to use it for some private tests because actual software didn´t fit our needs, so we are going to probe how is the behavior of different GPL VoIP servers against this kind of attacks: - Asterisk: I think it needs no introduction, the famous softswitch/PBX software. - Freeswitch: It´s a newer soft...

Ni ceros ni unos ...

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