ZDI-07-038: Microsoft Internet Explorer Prototype Dereference Code Execution Vulnerability Jun 12 2007 08:37PM
zdi-disclosures 3com com
ZDI-07-038: Microsoft Internet Explorer Prototype Dereference Code

Execution Vulnerability


June 12, 2007

-- CVE ID:


-- Affected Vendor:


-- Affected Products:

Internet Explorer 6.x

Internet Explorer 7.x

-- TippingPoint(TM) IPS Customer Protection:

TippingPoint IPS customers have been protected against this

vulnerability since October 10, 2006 by Digital Vaccine protection

filter ID 4761. 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 flaw is specifically exposed when a prototype variable points to a

table cell and then that table cell is removed. This results in an

invalid pointer dereference which can be leveraged to result in

arbitrary code execution.

-- Vendor Response:

Microsoft has issued an update to correct this vulnerability. More

details can be found at:


-- Disclosure Timeline:

2006.10.10 - Digital Vaccine released to TippingPoint customers

2007.02.15 - Vulnerability reported to vendor

2007.06.12 - Coordinated public release of advisory

-- Credit:

This vulnerability was discovered by Sam Thomas.

-- About the Zero Day Initiative (ZDI):

Established by TippingPoint, a division of 3Com, The Zero Day Initiative

(ZDI) represents a best-of-breed model for rewarding security

researchers for responsibly disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research

through the ZDI can find more information and sign-up at:


The ZDI is unique in how the acquired vulnerability information is used.

3Com does not re-sell the vulnerability details or any exploit code.

Instead, upon notifying the affected product vendor, 3Com provides its

customers with zero day protection through its intrusion prevention

technology. Explicit details regarding the specifics of the

vulnerability are not exposed to any parties until an official vendor

patch is publicly available. Furthermore, with the altruistic aim of

helping to secure a broader user base, 3Com provides this vulnerability

information confidentially to security vendors (including competitors)

who have a vulnerability protection or mitigation product.

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