TippingPoint Zero Day Initiative

Microsoft Internet Explorer Element Tags Vulnerability

ZDI-07-075: December 11th, 2007


Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 5822. 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 to exploit this vulnerability in that the target must visit a malicious page.

The specific flaw exists in the handling of document objects that have been created, modified, deleted then accessed by JavaScript. By storing references to document nodes, then removing them by a separate reference, the document model in memory becomes unstable. Accessing the tags property while the document is in this unstable condition results in a heap corruption, allowing the execution of arbitrary code.

Vendor Response

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

Disclosure Timeline

    2007-07-20 - Vulnerability reported to vendor
    2007-12-11 - Coordinated public release of advisory


This vulnerability was discovered by:
    Peter Vreugdenhil