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ZDI-10-154: Apple Webkit Button First-Letter Style Rendering Remote Code Execution Vulnerability
From: ZDI Disclosures <zdi-disclosures () tippingpoint com>
Date: Wed, 11 Aug 2010 14:59:26 -0500

ZDI-10-154: Apple Webkit Button First-Letter Style Rendering Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-10-154
August 11, 2010

-- CVE ID:
CVE-2010-1392

-- 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 10148. 
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. Authentication is not
required to exploit this vulnerability. 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 Webkit's support of the 'first-letter'
css style. If a particular container has the first-letter style applied
to it, the library will create a dual reference of text associated with
the style for rendering. Later upon repainting or style recalculation,
the application will access the freed memory which can lead to code
execution under the context of the application.

-- Vendor Response:
Apple states:
this issue was fixed in Safari 5.0
http://support.apple.com/kb/HT4196

-- Disclosure Timeline:
2010-06-01 - Vulnerability reported to vendor
2010-08-11 - 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
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specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
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