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