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Zero Day Initiative Advisory 11-290

Zero Day Initiative Advisory 11-290
Posted Oct 15, 2011
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 11-290 - 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 or open a malicious file. The specific flaw exists within mshtml.dll and is a logic bug in the way it handles the 'extra size index' in certain CDispNode classes within the SetExpandedClipRect function. When the 'extra size index' is zero, the code fails to correctly adjust the class instance pointer before and uses the vftable pointer as a flag field. This corrupts the vftable pointer and can lead to remote code execution under the context of the current user. This issue is closely related to CVE-2009-3672.

tags | advisory, remote, arbitrary, code execution
advisories | CVE-2011-2001
SHA-256 | 1d40d6b1ba8dfd59633c144649c1581d7ee175acfcca3e3c50b35fcaa6c656a9

Zero Day Initiative Advisory 11-290

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Hash: SHA1

ZDI-11-290 : Microsoft Internet Explorer SetExpandedClipRect Remote
Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-11-290
October 15, 2011

- -- CVE ID:
CVE-2011-2001

- -- CVSS:
7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P

- -- Affected Vendors:

Microsoft



- -- Affected Products:

Microsoft Internet Explorer



- -- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 11740.
For further product information on the TippingPoint IPS, visit:

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 or open a malicious file.

The specific flaw exists within mshtml.dll and is a logic bug in the way
it handles the 'extra size index' in certain CDispNode classes within
the SetExpandedClipRect function. When the 'extra size index' is zero,
the code fails to correctly adjust the class instance pointer before and
uses the vftable pointer as a flag field. This corrupts the vftable
pointer and can lead to remote code execution under the context of the
current user. This issue is closely related to CVE-2009-3672.

- -- Vendor Response:

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

http://technet.microsoft.com/en-us/security/bulletin/ms11-081



- -- Disclosure Timeline:
2011-07-21 - Vulnerability reported to vendor
2011-10-15 - Coordinated public release of advisory

- -- Credit:
This vulnerability was discovered by:

* Anonymous



- -- 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. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint 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, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

http://www.zerodayinitiative.com/advisories/disclosure_policy/

Follow the ZDI on Twitter:

http://twitter.com/thezdi
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