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Cross Site Scripting exploitation via malformed files


It was publicly released on different forums 
(http://cyruxnet.org/foro/viewtopic.php?t=559); multiple webmail systems and 
websites are vulnerable to Cross Site Scripting via a malformed file.

A basic PoC :

Build a text file (ie: photo.txt)

&lt;script language="Javascript">
alert('Vulnerable!');
&lt;/script&gt;

then rename the file with the .jpg extension (photo.jpg), and send the renamed 
file as attachement by mail to the victim.

On many webmail systems, when the JPG file is downloaded, then the script is 
executed (you can play with javascript, vbscript,...)

It was verified under IE - XP SP2

So it opens a door for virus...


Regards and greetings to: ZaBoo, whitehat.co.il, Class101, Mandragore

Jerome ATHIAS