-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

ZDI-11-287 : Internet Explorer Select Element Cache Remote Code
Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-11-287
October 15, 2011

- -- CVE ID:
CVE-2011-1996

- -- 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 11759.
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 caching implementation of a Select
element. When modifying this cache, there are certain methods that do
not update the cache correctly. Due to these inconsistencies, one can
desynchronize the cache with elements that have been freed. While
using these freed elements, the application's perception of
type-safety becomes skewed and usage of the object can lead to 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://technet.microsoft.com/en-us/security/bulletin/ms11-081



- -- Disclosure Timeline:
2011-06-03 - Vulnerability reported to vendor
2011-10-15 - Coordinated public release of advisory

- -- Credit:
This vulnerability was discovered by:

* Ivan Fratric


*  http://ifsec.blogspot.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
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (Cygwin)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

iQEcBAEBAgAGBQJOmaijAAoJEFVtgMGTo1scmJYIAKg9t1azgRW10XR6NCo3RVf2
Njf2Wa2QJBzFvrdwkgXoPIPPq4YepzqA+Z3eBun0oFjo/X2gbxInK1g78HltN6NT
Jw0WQawquD7Wley/N753hnYy6yAcPoi6bb6XDoELglZlBKqIf252x8WB1wjbbDAj
iqe6qD5ad5HIhu1QnbbO7DTgMipYvPBmAFymBdwHGEfdsB2vXuiPGEiGXR9hTfZF
vrM1xJY0PfMdOVM31AWUwsnF2ubxLo+jD7OKNEj8ZE2FWkrRvrO/w24WinspsXoE
Uxvoyy9DlfWpVDaWM0wuFWaPTDZhWrgdpV9BeHvEIHjd/YNHc/ZNJNma8OexUno=
=+CzJ
-----END PGP SIGNATURE-----

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/