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Zero Day Initiative Advisory 11-248

Zero Day Initiative Advisory 11-248
Posted Aug 10, 2011
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 11-248 - 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 the part of the application that is responsible for handling STYLE elements. By creating a STYLE element with an invalid behavior, an attacker can force an object of invalid type to be called, resulting in corruption of heap memory. This can be leveraged by an attacker to achieve code execution under the context of the application.

tags | advisory, remote, arbitrary, code execution
advisories | CVE-2011-1964
SHA-256 | 9eb2dfda180769f65780f31f14c72642a804c72ddbb88f6572507e71448979f2

Zero Day Initiative Advisory 11-248

Change Mirror Download
ZDI-11-248: Microsoft Internet Explorer 9 STYLE Object Parsing Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-248

August 9, 2011

-- CVE ID:
CVE-2011-1964

-- CVSS:
9, (AV:N/AC:L/Au:N/C:P/I:P/A:C)

-- 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 11456.
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 the part of the application that is
responsible for handling STYLE elements. By creating a STYLE element
with an invalid behavior, an attacker can force an object of invalid
type to be called, resulting in corruption of heap memory. This can be
leveraged by an attacker to achieve code execution under the context of
the application.

-- Vendor Response:
Microsoft has issued an update to correct this vulnerability. More
details can be found at:
http://www.microsoft.com/technet/security/bulletin/MS11-057.mspx

-- Disclosure Timeline:
2011-05-25 - Vulnerability reported to vendor
2011-08-09 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
* Stephen Fewer of Harmony Security (www.harmonysecurity.com)

-- 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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