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Malicious file upload in .JPG or GIF format

From: whitehat (whitehaatgmail.com)
Date: Wed Feb 20 2008 - 10:44:18 CST

Dear List,

I'm doing Web Application Pen-Testing. In one of the pages there is an
option to upload an image(.JPG or .GIF).
How a hacker can exploit it and what are the chances of uploading a
malicious .exe file (virus kind of stuff) in .JPG or .GIF format by
changing its extension.

Thanks in advance,


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