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ZDI-11-119: (Pwn2Own) Microsoft Internet Explorer onPropertyChange Remote Code Execution Vulnerability



ZDI-11-119: (Pwn2Own) Microsoft Internet Explorer onPropertyChange Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-119

April 12, 2011

-- CVE ID:
CVE-2011-1345 

-- 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 11040. 
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 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
onPropertyChange function calls. When the onPropertyChange event handler
is set to an object's attribute collection, it fails to keep an accurate
reference counter to the event object. The effect of this can be that
the program frees the event object while there are still references to
it. This can result in remote code execution under the content of the
current user.

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

http://www.microsoft.com/technet/security/Bulletin/MS11-018.mspx

-- Disclosure Timeline:
2011-03-09 - Vulnerability reported to vendor
2011-04-12 - Coordinated public release of advisory

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

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