RealPlayer vidplin.dll AVI Processing Heap Overflow Release Date: June 23, 2005 Date Reported: May 4, 2005 Patch Development Time (In Days): 36 Severity: High (Code Execution) Vendor: RealNetworks Systems Affected: For Microsoft Windows RealPlayer 10.5 (6.0.12.1040-1069) RealPlayer 10 RealOne Player v2 RealOne Player v1 RealPlayer 8 RealPlayer Enterprise Overview: eEye Digital Security has discovered a critical vulnerability in RealPlayer. The vulnerability allows a remote attacker to reliably overwrite heap memory with arbitrary data and execute arbitrary code in the context of the user who executed the player. This specific flaw exists within the vidplin.dll file used by RealPlayer. By specially crafting a malformed .avi movie file, a direct heap overwrite is triggered, and reliable code execution is then possible. This vulnerability can be trigger when a user views a webpage, or opens an .avi file via email, instant messenger, or other common file transfer programs. Technical Details: When processing AVI files RealPlayer calls upon a specific DLL, vidplin.dll, where the vulnerability lies. Realplayer relies on a strf structure value and allocates a fixed memory space of 0x428 that can be overflowed with values greater than the fixed buffer size causing arbitrary code to be executed. Protection: Retina - Network Security Scanner - has been updated to identify this vulnerability. Blink - End-point Vulnerability Prevention - protects from this vulnerability. Vendor Status: RealNetworks has released a patch for this vulnerability. http://service.real.com/help/faq/security/050623_player/EN/ Credit: Discovery: Flashsky Related Links: Retina Network Security Scanner - Free 15 Day Trial http://www.eeye.com/html/Products/Retina/download.html Blink End Point Vulnerability Prevention http://www.eeye.com/html/Products/Blink Copyright (c) 1998-2005 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 alertat_private 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.
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