SEC Consult SA-20090415-1 :: Nortel Application Gateway 2000 Password Disclosure Vulnerability

[Bernhard Mueller <research@xxxxxxxxxxxxxxx>]

SEC Consult Security Advisory < 20090415-1 >
==========================================================================
              title: Nortel Application Gateway 2000 Password 
                     Disclosure Vulnerability
            program: Nortel Application Gateway 2000
 vulnerable version: 6.3.1 and prior
           homepage: http://www.nortel.com/ag2000
              found: 2008-11-14
                 by: David Matscheko / SEC Consult / www.sec-consult.com
               link:
https://www.sec-consult.com/files/20090415-1_nortel_AG_password_disclosure.txt
==========================================================================

Vendor description:
-------------------

The Application Gateway delivers practical, converged voice and data
applications on Nortel IP phones that enable organizations to benefit
more fully from IP telephony. The prepackaged, easy-to-learn,
easy-to-use Voice Office applications help increase productivity and
enhance organizational communications - without requiring any
integration work. For the hospitality sector, the Guest Services
applications provide additional services/features, generate revenue from
advertising on the phone screen, and reduce the cost of operations by
enabling guests to self serve. Custom development tools are also
available to end customers for delivery of customized content to IP
phones.

[source: http://www.nortel.com/ag2000]


Vulnerability overview:
-----------------------

The Nortel Application Gateway provides an administration interface
"Nortel Administration Tool powered by Citrix". This interface responds
with sensitive information to unauthorized users.


Vulnerability description:
--------------------------

The "Nortel Administration Tool powered by Citrix" can be accessed under
the URL "https://<server>:3001/". The subframe
"https://<server>:3001/adminDownloads.htm" does not show any content in
the browser view. However the HTML-source of this frame contains
sensitive information like an administrative call server user account:

---
<div id="call_server_host" value="10.11.12.13"></div> [...]
<div id="call_server_telnet_port" value="23"></div> [...]
<div id="call_server_user" value="admin123"></div>
<div id="call_server_pwd" value="hugo123"></div>
---


Proof of concept:
-----------------

This vulnerability can be exploited with a web browser and plugins / web
proxy.


Vendor contact timeline:
------------------------

January 2009: Vendor informed about vulnerability
2009-04-14: Patch available


Patch:
------

The vendor has released a vulnerability fix which addresses the issue.
In addition, the vendor has released a public security advisory
containing update instructions. URL:

http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=865005


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EOF SEC Consult Vulnerability Lab / @2009