ZDI-07-075: Microsoft Internet Explorer Element Tags Vulnerability Dec 11 2007 10:18PM
zdi-disclosures 3com com
ZDI-07-075: Microsoft Internet Explorer Element Tags Vulnerability


December 11, 2007

-- CVE ID:


-- Affected Vendor:


-- Affected Products:

Internet Explorer 6

Internet Explorer 7

-- TippingPoint(TM) IPS Customer Protection:

TippingPoint IPS customers have been 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

-- Credit:

This vulnerability was discovered by Peter Vreugdenhil.

-- About the Zero Day Initiative (ZDI):

Established by TippingPoint, 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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