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ZDI-11-252: Apple QuickTime PICT Image PnSize Opcode Remote Code Execution Vulnerability
From: ZDI Disclosures <zdi-disclosures () tippingpoint com>
Date: Fri, 12 Aug 2011 21:18:36 +0100

ZDI-11-252: Apple QuickTime PICT Image PnSize Opcode Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-252

August 8, 2011

-- CVE ID:
CVE-2011-0257

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

-- Affected Vendors:
Apple

-- Affected Products:
Apple Quicktime

-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Apple Quicktime. 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 way Quicktime handles the PnSize
PICT opcode. It converts an unsigned 16 bit value into a signed 32 bit
value. This value is later used as the size parameter for a memory copy
function that copies from the file onto the stack. The results in a
stack based buffer overflow that allows for remote code execution under
the context of the current user.

-- Vendor Response:
Apple has issued an update to correct this vulnerability. More
details can be found at:
http://support.apple.com/kb/HT4826

-- Disclosure Timeline:
2011-04-11 - Vulnerability reported to vendor
2011-08-08 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Matt "j00ru" Jurczyk

-- 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

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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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provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
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