TippingPoint Zero Day Initiative

Microsoft Internet Explorer XHTML DOM Manipulation Memory Corruption Vulnerability

ZDI-09-086: December 8th, 2009


Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 9320. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Internet Explorer. User interaction is required in that a user must visit a malicious web page.

The specific flaw exists in the manipulation and parsing of certain HTML tags. The ordering of various objects in a malformed way results in memory corruption resulting in a call to a dangling pointer which can be further leveraged via a heap spray. Exploitation of this vulnerability will lead to remote system compromise under the credentials of the currently logged in user.

Vendor Response

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

Disclosure Timeline

    2009-06-23 - Vulnerability reported to vendor
    2009-12-08 - Coordinated public release of advisory


This vulnerability was discovered by:
    Sam Thomas of eshu.co.uk