bugtraq - ZDI-11-195: Microsoft Internet Explorer selection.empty Remote Code Execution Vulnerability

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Message-ID: <AF6E290B52139041BD6CA591212E455B5764706738@GVW0442EXB.americas.hpqcorp.net>
Date: Tue, 14 Jun 2011 19:22:57 +0000
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: "'full-disclosure@...ts.grok.org.uk'" <full-disclosure@...ts.grok.org.uk>, 
	"'bugtraq@...urityfocus.com'" <bugtraq@...urityfocus.com>
Subject: ZDI-11-195: Microsoft Internet Explorer
 selection.empty Remote Code Execution Vulnerability

ZDI-11-195: Microsoft Internet Explorer  selection.empty Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-195

June 14, 2011

-- CVE ID:
CVE-2011-1261

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

-- Affected Vendors:
Microsoft

-- Affected Products:
Microsoft Internet Explorer 9
Microsoft Internet Explorer 8

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 11271. 
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 way Internet explorer handles the
javascript statement 'selection.empty' during certain onclick events. By
causing a particular sequence of events, an attacker can cause a
CDisplayObject to be freed while it is still in use. This results in an
operation on previously freed memory that can be utilized to achieve
remote code execution.

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

http://www.microsoft.com/technet/security/Bulletin/MS11-050.mspx

-- Disclosure Timeline:
2011-04-04 - Vulnerability reported to vendor
2011-06-14 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Anonymous

-- About the Zero Day Initiative (ZDI):
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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

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TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
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