EEYEB-20051117A Apple QuickTime STSD Atom Heap Overflow Release Date: January 10, 2006 Date Reported: November 17, 2005 Patch Development Time (In Days): 54 Days Severity: High (Code Execution) Vendor: Apple Systems Affected: Quicktime on Windows 2000 Quicktime on Windows XP Quicktime on Mac OS X 10.3.9 Apple iTunes on Windows 2000 Apple iTunes on Windows XP Apple iTunes on OS X 10.3.9 Overview: eEye Digital Security has discovered a critical vulnerability in QuickTime Player. The vulnerability allows a remote attacker to reliably overwrite heap memory with user-controlled data and execute arbitrary code in the context of the user who executed the player or application hosting the QuickTime plug-in. This specific flaw exists within the QuickTime.qts file which many applications access QuickTime's functionality through. By specially crafting atoms within a movie file, a direct heap overwrite is triggered, and reliable code execution is then possible. Technical Details: Technical Description: The code in QuickTime.qts responsible for the size of the Sample Description Table entries from the 'stsd' atom in a QuickTime-format movie on the heap. According to developer.apple.com, the format of the Sample Description Atom is as follows: Field Description ---------------------------------------------------------------- Size 32-bit int Data Format 4 char code Reserved 6 bytes that must be 0 Data Reference Index 16-bit int Hint Track Version 16-bit unsigned int Last compatible hint track version 16-bit unsigned int Max Packet Size 32-bit int Additional Data Table Variable By setting the size of the Sample Description Table to a size of 00 15 - 00 D0 will cause a heap-based overflow. By supplying the "Last compatible hint track version" field with the value of 00 05 - 00 09, an insufficiently-sized heap block will be allocated, resulting in a classic complete heap memory overwrite during the RtlAllocateHeap() function and the attacker can control memory with data taken from the filename of the .MOV file. This vulnerability can be successfully exploited via an embedded media player in an HTML page, email, or HTML link. References 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. Vendor Status: Apple has released a patch for this vulnerability. The patch is available via the Updates section of the affected applications. This vulnerability has been assigned the CVE identifier CVE-2005-4092. Credit: Discovery: Karl Lynn Greetings: 0x41414141 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 (at) eEye (dot) com [email concealed] 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.