Apple QuickTime FPX Integer Overflow

Release Date:
May 11, 2006

Date Reported:
March 7, 2006

Patch Development Time (In Days):
65     

Severity:
High (Remote Code Execution)

Vendor:
Apple

Systems Affected:
Quicktime on Windows 2000
Quicktime on Windows XP
Quicktime on Mac OS X 10.3.9

References:
This vulnerability has been assigned CVE-2006-1249

Overview:
eEye Digital Security has discovered a critical vulnerability in
QuickTime Player. There is a integer overflow in the way QuickTime
processes fpx format files. An attacker can create a fpx file and send
it to the user via email, web page, or fpx file with activex.

Technical Description:
In an fpx file, there is a field that figures out how many blocks of
data there are in that file. One block data size is 0x200, QuickTime
Player will allocate memory relying on (number*0x200) but does not check
the size value and an integer overflow can occur.  If you set the block
value to 0x800000 an integer overflow will occur which will then cause a
heap overflow and write invalid memory.  

QuickTime: QuickTime File Format
http://developer.apple.com/documentation/QuickTime/QTFF/index.html 

Protection:
Retina Network Security Scanner has been updated to identify this
vulnerability.
Blink - Endpoint Vulnerability Prevention - preemptively protects from
this vulnerability.

Vendor Status:
Apple has released a patch for this vulnerability information is
available at http://docs.info.apple.com/article.html?artnum=61798 

Credit:
Discovery: Fang Xing

Copyright (c) 1998-2006 eEye Digital Security Permission is hereby
granted for the redistribution of this alert electronically. It is not
to be edited in any way without express consent of eEye. If you wish to
reprint the whole or any part of this alert in any other medium
excluding electronic medium, please email alert@eEye.com for permission. 

Disclaimer
The information within this paper may change without notice. Use of this
information constitutes acceptance for use in an AS IS condition. There
are no warranties, implied or express, with regard to this information.
In no event shall the author be liable for any direct or indirect
damages whatsoever arising out of or in connection with the use or
spread of this information. Any use of this information is at the user's
own risk.