TippingPoint Zero Day Initiative

Microsoft Internet Explorer IFrame Attributes Circular Reference Dangling Pointer Vulnerability

ZDI-09-088: 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 9325. 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 web page.

The specific flaw exists during deallocation of a circular dereference for a CAttrArray object. If the CAttrArray object has been freed prior to the tearing down of the webpage, the application will access the freed memory during the deallocation of the circular dereference. This can lead to code execution under the context 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

    2009-08-10 - Vulnerability reported to vendor
    2009-12-08 - Coordinated public release of advisory


This vulnerability was discovered by: