PRL-2012-10

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Application:  IrfanView 4.33 Format PlugIn ECW Decompression Heap Overflow

Plateform:   Windows

Exploitation:   Remote code execution

Secunia Number:   SA49204

{PRL}:   2012-10

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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2012-05-15 – Vulnerability reported to secunia
2012-05-31 – Coordinated public release of advisory

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3) Technical details
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The vulnerability is caused due to insufficient validation when decompressing an ECW images

and can be exploited to cause a heap-based buffer overflow via a specially crafted file.

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4) The Code
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Here

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