TippingPoint Digital Vaccine Laboratories
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Microsoft Internet Help COM Object Memory Corruption Vulnerability

TPTI-06-08: August 8th, 2006


Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 4581. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows 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 vulnerability can lead to code execution when instantiating the Internet.HHCtrl COM object through Internet Explorer. The flaw exists due to invalid freeing of heap memory when several calls to the "Image" property of the ActiveX control are performed. By abusing the jscript.dll CScriptBody::Release() function user supplied data can be executed.

Vendor Response

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

Disclosure Timeline

    2006-04-27 - Vulnerability reported to vendor
    2006-08-08 - Coordinated public release of advisory


This vulnerability was discovered by: