Re: Pbx testing

Hey,

On Tue, 13 Jun 2006, Grizzly wrote:

Hi list,
have someone any idea about general pbx testing (assessment, pentest)?
Thanks!

First of all, if you haven't done it yet, i strongly suggest you to read
the excellent NIST Special Publication titled "PBX Vulnerability Analysis:
Finding Holes in Your PBX Before Someone Else Does" (sp800-24pbx.pdf).

Even though it's slightly outdated (written in 2000), it's still a great
resource for security auditors and network administrators. Take also a
look at OSSTMM (http://www.isecom.org/) and ISSAF (http://www.oisg.org/)
-- but don't expect to find too much in both of them about this topic.

Google, vendors documentation and the archives of this mailing list may
ideed help as well;)

Here's a quick audit checklist off the top of my head:

1) Administrative access: default and easily-guessable passwords, console
access, remote maintenance, feature access, etc.
2) System configuration and operating system patchlevel
3) Vendor-specific issues
4) Configuration-specific issues: station, trunking, call privileges, call
routing, other specific features, etc.
5) Audit trails and logs review
6) Mailbox audit
7) Wardialing: scan the extensions hunting for modems
8) YMMV

Moreover, if the PBX you're testing speaks also TCP/IP, all the usual IP
networks vulnerabilities may also apply, so be sure to check them all --
but since usually these kind of TCP/IP stacks aren't very robust, beware
of not DoS'ing it, specially if it's a production PBX!

Finally, if it's a VoIP PBX, you should check a whole other range of
possible security issues. As a side note, i'm currently working on a
complete VoIP security testing methodology for ISECOM's OSSTMM: you'll see
the results of my research in the near future.

Cheers,

--
Marco Ivaldi
Antifork Research, Inc. http://0xdeadbeef.info/
3B05 C9C5 A2DE C3D7 4233 0394 EF85 2008 DBFD B707


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