full-disclosure - ZDI-11-138: Webkit Undefined DOM Prototype Attach Remote Code Execution Vulnerability

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Date: Tue, 19 Apr 2011 20:31:45 +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-11-138: Webkit Undefined DOM Prototype Attach
 Remote Code Execution Vulnerability

ZDI-11-138: Webkit Undefined DOM Prototype Attach Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-138

April 19, 2011

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

-- Affected Vendors:
WebKit

-- Affected Products:
WebKit WebKit

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 11100. 
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 application's implementation of a
Frame element. When attaching this element to a document, the
application will duplicate a reference of an anonymous block. When
freeing the container holding the Frame element, the reference will
still be available. If an attacker can perform an explicit type change
of the contents the element this can then be leveraged to gain code
execution under the context of the application.

-- Vendor Response:
Webkit fix:
http://trac.webkit.org/changeset/67182

-- Disclosure Timeline:
2011-03-31 - Vulnerability reported to vendor
2011-04-19 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * wushi of team509

-- 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/

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