Here is a generic outline of what one should check for when auditing a PBX
1. Administrative Access
2. System Configuration
3. Audit Trails (i.e. History File, Audit Trail, Call Detail Recording,)
4. Station - (Basic Access Restrictions, Station Features, Hunt and Call
Forwarding features, External References)
5. Trunking (Routes, Trunks)
6. Call Privileges (Code Restrictions, Scheduled Access Restrictions,
Controlled Class of Service, Basic and Network Authorization Codes, Forced
Accounts)
7. Feature Access Review
8. Direct Inward System Access (DISA, DISA Digit Insertion)
9. ACD (ACD Pattern Confguration, Agents)
10. Call Routing (Route List Indices, Routing Control, Translation Tables,
Digit Manipulation, Incoming DID, Incoming Trunk Exclusions, Call Screening,
Class of Service)
11. Mailbox Audit (Disabled Mailboxes, Unused Mailboxes, Invalid Login
Attempts, External DNs, Restriction/Permission Lists, Messaging Features, Voice
Services, Fax Services, Additional Features, Monitoring Access)
Mileage may vary.
-----Original Message-----
From: Hubert Seiwert <hubert@westpoint.ltd.uk>
Sent: Sep 8, 2005 8:12 AM
To: mmarrero@lloydstsb-usa.com, pen-test@securityfocus.com
Subject: Re: Pen Testing a PBX (Northern Telecom Meridian-1)
Check http://www.phrack.org/phrack/47/P47-15 - I don't know how relevant this
is
to the versions that are around today but it may be a starting point. In my
experience it's very common for users to have bad passwords, i.e. the same as
their mailbox number. If you can get into any mailbox this obviously leads to
exposure of voice mails but also potentially to the ability to make outgoing or
internal phone calls, which may be useful for social engineering attacks within
the organisation or making long distance and international calls at the
organisation's expense.
mmarrero@lloydstsb-usa.com wrote:
Hello list,
I am about to start a pentest of a PBX system. I was wondering if there are
any vulnerabilities against this make and model of PBX. Also, does anyone
know of a paper on how to appropriately conduct a pentest. I do not want to
miss anything.
--
Hubert Seiwert
Internet Security Specialist, Westpoint Ltd
Albion Wharf, 19 Albion Street, Manchester M1 5LN, United Kingdom
Web: www.westpoint.ltd.uk
Tel: +44-161-2371028
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