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

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Date: Tue, 16 Aug 2011 22:53:45 +0100
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: "'full-disclosure@...ts.grok.org.uk'" <full-disclosure@...ts.grok.org.uk>,
  "'bugtraq@...urityfocus.com'" <bugtraq@...urityfocus.com>
Subject: ZDI-11-260: Nortel Media Application Server cstore.exe cs_anams
 Remote Code Execution Vulnerability

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):
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a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

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