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PayPal Inc Bug Bounty #113 - Client Side Cross Site Scripting Vulnerability

2015-04-21 21:30
Document Title:
===============
PayPal Inc Bug Bounty #113 - Client Side Cross Site Scripting Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1453

Video: http://www.vulnerability-lab.com/get_content.php?id=1454

View: https://www.youtube.com/watch?v=v5egy9V_Bs0


Release Date:
=============
2015-04-18


Vulnerability Laboratory ID (VL-ID):
====================================
1453


Common Vulnerability Scoring System:
====================================
3.4


Product & Service Introduction:
===============================
PayPal is a global e-commerce business allowing payments and money transfers to be made through the Internet. Online
money
transfers serve as electronic alternatives to paying with traditional paper methods, such as checks and money orders.
Originally,
a PayPal account could be funded with an electronic debit from a bank account or by a credit card at the payer s
choice. But some
time in 2010 or early 2011, PayPal began to require a verified bank account after the account holder exceeded a
predetermined
spending limit. After that point, PayPal will attempt to take funds for a purchase from funding sources according to a
specified
funding hierarchy. If you set one of the funding sources as Primary, it will default to that, within that level of the
hierarchy
(for example, if your credit card ending in 4567 is set as the Primary over 1234, it will still attempt to pay money
out of your
PayPal balance, before it attempts to charge your credit card). The funding hierarchy is a balance in the PayPal
account; a
PayPal credit account, PayPal Extras, PayPal SmartConnect, PayPal Extras Master Card or Bill Me Later (if selected as
primary
funding source) (It can bypass the Balance); a verified bank account; other funding sources, such as non-PayPal credit
cards.
The recipient of a PayPal transfer can either request a check from PayPal, establish their own PayPal deposit account
or request
a transfer to their bank account.

PayPal is an acquirer, performing payment processing for online vendors, auction sites, and other commercial users, for
which it
charges a fee. It may also charge a fee for receiving money, proportional to the amount received. The fees depend on
the currency
used, the payment option used, the country of the sender, the country of the recipient, the amount sent and the
recipient s account
type. In addition, eBay purchases made by credit card through PayPal may incur extra fees if the buyer and seller use
different currencies.

On October 3, 2002, PayPal became a wholly owned subsidiary of eBay. Its corporate headquarters are in San Jose,
California, United
States at eBay s North First Street satellite office campus. The company also has significant operations in Omaha,
Nebraska, Scottsdale,
Arizona, and Austin, Texas, in the United States, Chennai, Dublin, Kleinmachnow (near Berlin) and Tel Aviv. As of July
2007, across
Europe, PayPal also operates as a Luxembourg-based bank.

On March 17, 2010, PayPal entered into an agreement with China UnionPay (CUP), China s bankcard association, to allow
Chinese consumers
to use PayPal to shop online.PayPal is planning to expand its workforce in Asia to 2,000 by the end of the year 2010.

(Copy of the Homepage: www.paypal.com) [http://en.wikipedia.org/wiki/PayPal]


Abstract Advisory Information:
==============================
An independent Vulnerability Laboratory researcher discovered a client-side cross site scripting web vulnerability in
the official PayPal Inc online service web-application.


Vulnerability Disclosure Timeline:
==================================
2014-12-30: Researcher Notification & Coordination (Milan A Solanki)
2014-12-31: Vendor Notification (PayPal Inc - Bug Bounty Team)
2015-01-08: Vendor Response/Feedback (PayPal Inc - Bug Bounty Team)
2015-01-15: Vendor Fix/Patch (PayPal Inc - Developer Team)
2015-04-18: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
PayPal Inc
Product: PayPal - Online Service Web Application 2015 Q2


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


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


Technical Details & Description:
================================
A non persistent cross site scripting web vulnerability has been discovered in the official PayPal Inc online service
web-application.
The vulnerability allows remote attackers to hijack website customer, moderator or admin sessions data by client-side
manipulated cross site requests.

The vulnerability is located in the `q` values of the merchant search module. Remote attackers are able to inject own
script codes to the vulnerable GET method
request of the merchant search module. The attack vector of the vulnerability is located on the client-side of the
paypal online service web-application.
The request method to inject the script code on client-side is `GET`. The injection point of the issue is the
vulnerable `q` value in the search engine and
the script code execution point is located in the results output context page.

The security risk of the non-persistent input validation web vulnerability is estimated as medium with a cvss (common
vulnerability scoring system) count of 3.4.
Exploitation of the client-side cross site scripting web vulnerability requires low user interaction (click) and no
privileged application user account.
Successful exploitation results in client-side account theft by hijacking, client-side phishing, client-side external
redirects and non-persistent manipulation
of affected or connected service modules.

Request Method(s):
[+] GET

Vulnerable Service(s):
[+] PayPal Inc (paypal.com)

Vulnerable Module(s):
[+] Merchant Search

Vulnerable Parameter(s):
[+] q

Affected Section(s):
[+] Merchant Search Results


Proof of Concept (PoC):
=======================
The client-side cross site scripting web vulnerability can be exploited by remote attackers without privileged
application user account and with low user interaction (click).
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below
to continue.

PoC: Example
https://www.paypal.com/directory/merchants?q=directory/merchants?q=&q=q=directory/merchants?q=&q=[CROSS SITE SCRIPTING
VULNERABILITY!]

PoC: Payload(s)
https://www.paypal.com/directory/merchants?q=directory/merchants?q=&q=q=directory/merchants?q=&q=%22%3E%3Cimg%20src=x%20onerror=prompt%28document.domain%29%3E
https://www.paypal.com/directory/merchants?q=directory/merchants?q=&q=q=directory/merchants?q=&q=%22%3E%3Ciframe%20src=x%20onerror=prompt%28document.cookie%29%3E


Reference(s):
https://www.paypal.com/directory/merchants?q=directory/merchants?q=
https://www.paypal.com/directory/merchants?q=directory/merchants?q=&q=q=directory/merchants?q=&q=


Solution - Fix & Patch:
=======================
2015-01-15: Vendor Fix/Patch (PayPal Inc - Developer Team)


Security Risk:
==============
The security risk of the client-side cross site scripting web vulnerability in the `q` merchant search value is
estimated as medium. (CVSS 3.4)


Credits & Authors:
==================
Milan A Solanki - (milans812 () gmail com) [www.safehacking4mas.blogspot.in]


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. Vulnerability-Lab or
its suppliers are not liable
in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special
damages, even if Vulnerability-Lab
or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or
limitation of liability for
consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody
to break any vendor licenses,
policies, deface websites, hack into databases or trade with fraud/stolen material.

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