TippingPoint Zero Day Initiative

Microsoft Windows Media Player ASX Meta-File Parsing Remote Code Execution Vulnerability

ZDI-12-034: February 22nd, 2012


CVSS Score

Affected Vendors

Affected Products

    Windows Media Player

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 12080. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Windows Media Player. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of ASX meta files. When the code within wmp.dll attempts to process the version string within a meta file, it copies it to a fixed-length buffer on the stack without checking that the destination can contain the input data. This can be abused remotely by attackers to execute arbitrary code under the context of the user running the media application.

Vendor Response

Microsoft has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2011-11-04 - Vulnerability reported to vendor
    2012-02-22 - Coordinated public release of advisory


This vulnerability was discovered by:
    Alexander Gavrun