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HistoryOct 31, 2011 - 12:00 a.m.

ZDI-11-315 : Apple QuickTime FLC Delta Decompression Remote Code Execution Vulnerability


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ZDI-11-315 : Apple QuickTime FLC Delta Decompression Remote Code
Execution Vulnerability
October 27, 2011


9, AV:N/AC:L/Au:N/C:P/I:P/A:C

– Affected Vendors:


– 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 decodes flic file.
Flic files can contain FLC Delta Decompression block containing Run
Length Encoded data. Quicktime fails to correctly checking the
decompression size when decoding the RLE data. This allowes for a 4 byte
overwrite past the end of the buffer which could result into 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:

– Disclosure Timeline:
2011-06-03 - Vulnerability reported to vendor
2011-10-27 - Coordinated public release of advisory

– Credit:
This vulnerability was discovered by:

  • Matt "j00ru" Jurczyk

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