[Full-disclosure] ZDI-11-254: Apple QuickTime 'trun' atom sampleCount Integer Overflow Remote Code Execution Vulnerability

[ZDI Disclosures <zdi-disclosures@xxxxxxxxxxxxxxxx>]

ZDI-11-254: Apple QuickTime 'trun' atom sampleCount Integer Overflow Remote 
Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-254

August 16, 2011

-- CVE ID:
CVE-2011-0256

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

-- Affected Vendors:
Apple

-- Affected Products:
Apple Quicktime

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 11582. 
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 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 'trun'
atom. QuickTime uses user supplied data in the 'sampleCount' field to
calculate a buffer size. An integer wrap can occur that results in the
allocation of a memory buffer that is smaller than intended. When
QuickTime writes to this buffer it causes a memory corruption that can
lead to 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:
2011-06-03 - Vulnerability reported to vendor
2011-08-16 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Anonymous

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