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ZDI-11-095: Apple Webkit Error Message Mutation Remote Code Execution Vulnerability
From: ZDI Disclosures <zdi-disclosures () tippingpoint com>
Date: Wed, 2 Mar 2011 22:31:37 +0000

ZDI-11-095: Apple Webkit Error Message Mutation Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-095

March 2, 2011

-- CVE ID:
CVE-2010-1824

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

-- Affected Vendors:
Apple

-- Affected Products:
Apple WebKit

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 10890. 
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's 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 methodology the application takes to
inform a user about an error while parsing a malformed document. When
displaying the error message, the application will append the message to
the current instance of the DOM tree causing another element to be
removed which will lead to the styles being recalculated. When the
styles are recalculated the application will access the initially freed
element which can lead to code execution under the context of the
application.

-- Vendor Response:
Apple has issued an update to correct this vulnerability. More
details can be found at:
http://support.apple.com/kb/HT4554

-- Disclosure Timeline:
2010-10-18 - Vulnerability reported to vendor
2011-03-02 - 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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