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Date: Tue, 11 Dec 2007 16:18:32 -0600
From: zdi-disclosures@...m.com
To: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com
Cc: zdi-disclosures@...m.com
Subject: ZDI-07-075: Microsoft Internet Explorer Element Tags Vulnerability

ZDI-07-075: Microsoft Internet Explorer Element Tags Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-07-075.html
December 11, 2007

-- CVE ID:
CVE-2007-5344

-- Affected Vendor:
Microsoft 

-- 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:

    http://www.tippingpoint.com 

-- 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:

http://www.microsoft.com/technet/security/bulletin/ms07-069.mspx

-- 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:

    http://www.zerodayinitiative.com

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.

CONFIDENTIALITY NOTICE: This e-mail message, including any attachments,
is being sent by 3Com for the sole use of the intended recipient(s) and
may contain confidential, proprietary and/or privileged information.
Any unauthorized review, use, disclosure and/or distribution by any 
recipient is prohibited.  If you are not the intended recipient, please
delete and/or destroy all copies of this message regardless of form and
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