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ZDI-11-139: Webkit Anonymous Frame Remote Code Execution Vulnerability
From: ZDI Disclosures <zdi-disclosures () tippingpoint com>
Date: Tue, 19 Apr 2011 20:33:59 +0000

ZDI-11-139 (formerly ZDI-CAN-1035): Webkit Anonymous Frame Remote Code Execution Vulnerability


April 19, 2011

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

-- Affected Vendors:

-- Affected Products:
WebKit WebKit

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 11101. 
For further product information on the TippingPoint IPS, visit:


-- 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 frame
element. When parsing a malformed document embedded inside an SVG
document, the library will create an anonymous block around a frame
element in the block's contents. When freeing this anonymous block via
an assignment to the read-only .textContent attribute, a reference to
one of the child elements will still exist. Accessing this child element
can then lead to code execution under the context of the application.

-- Vendor Response:
Webkit fix:

-- Disclosure Timeline:
2011-03-31 - Vulnerability reported to vendor
2011-04-19 - 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
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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
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