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Microsoft DirectShow Quicktime Atom Parsing Memory Corruption Vulnerability

TPTI-09-05: July 14th, 2009


Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 8307. 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. User interaction is required in that a target must visit a malicious page or open a malicious video file.

The specific flaw exists within Microsoft's DirectShow module quartz.dll. While parsing Quicktime atoms the NumberOfEntries field is trusted and if modified can control the location of several pointers meant to track stream positions. Specifying values that are larger than the number of bytes left to process in the input file will cause corruption that can be leveraged to execute arbitrary code.

Vendor Response

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

Disclosure Timeline

    2009-06-17 - Vulnerability reported to vendor
    2009-07-14 - Coordinated public release of advisory


This vulnerability was discovered by: