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Date: Fri, 21 Dec 2012 06:34:41 -0600
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: Full Disclosure <full-disclosure@...ts.grok.org.uk>, 
	BugTraq <bugtraq@...urityfocus.com>, zdi-disclosures@...com
Subject: ZDI-12-191 : Webkit HTMLMedia Element beforeLoad
 Remote Code Execution Vulnerability

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ZDI-12-191 : Webkit HTMLMedia Element beforeLoad Remote Code Execution
Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-12-191
December 21, 2012

- -- CVE ID:
CVE-2011-3071

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

- -- Affected Vendors:
WebKit.Org


- -- Affected Products:
WebKit.Org WebKit

- -- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 12492.
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 Apple Safari Webkit. 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 library's implementation of a HTMLMedia
element. After a source element is created, an attacker can catch the
beforeLoad event before the element is used, and delete the element. The
pointer to the source element will then be referenced causing a
use-after-free condition, which can lead to code execution under the
context of the application.

- -- Vendor Response:
WebKit.Org has issued an update to correct this vulnerability. More details
can be found at:
http://support.apple.com/kb/HT1222


- -- Disclosure Timeline:
2012-03-14 - Vulnerability reported to vendor
2012-12-21 - Coordinated public release of advisory

- -- Credit:
This vulnerability was discovered by:
* pa_kt / twitter.com/pa_kt


- -- 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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