Extropia WebStore Directory Traversal Vulnerability

Extropia WebStore is an e-commerce shopping cart application consisting of routines for error handling, order processing, encrypted mailing, frames, Javascript and VBscript.

The routine web_store.cgi does not properly handle the $file_extension variable if null characters are used.

For example if the following URL was requested, the file in question would not be delivered to the user:


However, by using the escaped character "%00", the requested file would be accessed successfully:


Successful exploitation could lead to a remote intruder gaining read access to any known file.


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