ZDI-11-196: Microsoft Internet Explorer HTTP 302 Redirect Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-196

June 14, 2011

-- CVE ID:
CVE-2011-1262

-- 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 11270. 
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 HTTP
302 redirects to CDL protocols. When Internet Explorer tries to
determine who is responsible for handling the protocol redirect it fails
to keep a correct reference counter to a Transaction object which
results in a use-after-free vulnerability. This can be leveraged into
remote code execution under the context 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/MS11-050.mspx

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

-- Credit:
This vulnerability was discovered by:
    * Peter Winter-Smith

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