TippingPoint Zero Day Initiative

Nortel Media Application Server cstore.exe cs_anams Remote Code Execution Vulnerability

ZDI-11-260: August 16th, 2011

CVSS Score

Affected Vendors


Affected Products

    Media Application Server

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 11580. For further product information on the TippingPoint IPS:

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:

Disclosure Timeline

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


This vulnerability was discovered by:
    AbdulAziz Hariri of ThirdEyeTesters