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Application:  IrfanView FlashPix PlugIn Double-Free Vulnerability

Platforms:   Windows

Exploitation:   Remote code execution

Secunia Number:   SA47322  

{PRL}:   2011-11

Author:   Francis Provencher (Protek Research Lab's)

Website:   http://www.protekresearchlab.com/

Twitter:   @ProtekResearch

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1) Introduction
2) Timeline
3) Technical details
4) PoC


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1) Introduction
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IrfanView is a freeware/shareware image viewer for Microsoft Windows that can view, edit, and convert image files

and play video/audio files. It is noted for its small size, speed, ease of use, and ability to handle a wide variety of graphic

file formats, and has some image creation and painting capabilities. The software was first released in 1996.

IrfanView is free for non-commercial use; commercial use requires paid registration.

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2) Timeline
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2011-12-08 - Vulnerability reported to vendor
2011-12-20 - Coordinated public release of advisory

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3) Technical details
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The vulnerability is caused due to the "Free_All_Memory()" function not properly setting certain decoder elements to

NULL after freeing them, which can be exploited to cause a double-free condition via specially crafted FPX images.

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4) The Code
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http://www.exploit-db.com/sploits/18256.fpx
http://www.protekresearchlab.com/exploits/PRL-2011-11.fpx