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ZDI-11-260: Nortel Media Application Server cstore.exe cs_anams Remote Code Execution Vulnerability
From: ZDI Disclosures <zdi-disclosures () tippingpoint com>
Date: Tue, 16 Aug 2011 22:53:45 +0100

ZDI-11-260: Nortel Media Application Server cstore.exe cs_anams Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-260

August 16, 2011

-- CVSS:
10, (AV:N/AC:L/Au:N/C:C/I:C/A:C)

-- Affected Vendors:
Nortel

-- Affected Products:
Nortel Media Application Server

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 11580. 
For further product information on the TippingPoint IPS, visit:

    http://www.tippingpoint.com

-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Nortel Media Application Server.
Authentication is not required to exploit this vulnerability. 

The flaw exists within the cstore.exe component which listens by default
on TCP port 52005. When handling a CONTENT_STORE_ADMIN_REQ packet type
the process trusts length value provided by the 'cs_anams' parameter and
blindly copies user supplied data into a fixed-length buffer on the
stack. A remote attacker can exploit this vulnerability to execute
arbitrary code under the context of the SYSTEM user.

-- Vendor Response:
Nortel has issued an update to correct this vulnerability. More
details can be found at:
https://support.avaya.com/css/P8/documents/100146108

-- Disclosure Timeline:
2011-02-17 - Vulnerability reported to vendor
2011-08-16 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * AbdulAziz Hariri of ThirdEyeTesters

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents 
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

    http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:
    http://www.zerodayinitiative.com/advisories/disclosure_policy/

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