Malicious file upload in .JPG or GIF format

[whitehat <whitehaat () gmail com>]

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,

Whitehat

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