'[Full-disclosure] Paypal Bug Bounty #21 - Persistent Encoding Vulnerability'

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List:       full-disclosure
Subject:    [Full-disclosure] Paypal Bug Bounty #21 - Persistent Encoding Vulnerability
From:       Vulnerability Lab <research () vulnerability-lab ! com>
Date:       2012-11-28 2:00:12
Message-ID: 50B5702C.6020300 () vulnerability-lab ! com
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Title:
======
Paypal Bug Bounty #21 - Persistent Encoding Vulnerability


Date:
=====
2012-11-25


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=684


VL-ID:
=====
684


Common Vulnerability Scoring System:
====================================
3


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. Between December 4Ã±9, 2010, \
PayPal services were attacked in a series of denial-of-service attacks organized by Anonymous \
in retaliation  for PayPal s decision to freeze the account of WikiLeaks citing terms of use \
violations over the publication of leaked US diplomatic cables.

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


Abstract:
=========
The Vulnerability Laboratory Research Team discovered a Web Vulnerability in the official \
Paypal Plaza website application.


Report-Timeline:
================
2012-08-14:	Researcher Notification & Coordination
2012-08-14:	Vendor Notification
2012-08-16:	Vendor Response/Feedback
2012-10-29:	Vendor Fix/Patch by PayPal Inc
2012-11-25:	Public or Non-Public Disclosure


Status:
========
Published


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


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


Details:
========
A persistent input validation vulnerability is detected in the official Paypal Plaza website \
application (Customers). The bug allows an attacker (remote) to implement/inject malicious \
script code on the application side (persistent) of the paypal plaza  egreetings web service. \
The vulnerability is located in the (Step 5 Preview) eGreeting module notification with the \
bound vulnerable  your name and  recipient's name parameters. The vulnerability can be \
exploited by remote attackers with low or medium required user inter  action and without \
privileged Customer/Pro/Seller account. Successful exploitation of the vulnerability can lead \
to session hijacking (customers),  account steal via persistent web attacks, persistent \
phishing or stable (persistent) mail notification context manipulation.

Vulnerable Type(s):
                          [+] eGreetings Service


Vulnerable Site(s):
                          [+] Paypal Plaza (paypal-plaza.com)


Vulnerable Module(s):
                          [+] Step 5 Preview for eGreeting


Vulnerable Parameter(s):
                          [+] Your Name
                          [+] Recipient's Name


Affected Section(s):
			  [+] Notification Mail - Dear > [value]


Proof of Concept:
=================
The persistent input validation vulnerability can be exploited by remote attackers with low or \
medium required user inter action.  For demonstration or reproduce ...

Review:  Notification Mail - eGreetings Card Notification

<html>
<head>
<title>You have received a eCard from your loved one.</title>
<link rel="important stylesheet" href="chrome://messagebody/skin/messageBody.css">
</head>
<body>
<table border=0 cellspacing=0 cellpadding=0 width="100%" \
class="header-part1"><tr><td><b>Betreff: </b> You have received a eCard from your loved \
one.</td></tr><tr><td><b>Von: </b>=?utf-8?B?Ij48aWZyYW1lIHNyYz1hIG9ubG9hZD1hbGVydCgiSEkiKSA8?=  \
<admin@vulnerability-lab.com></td></tr><tr><td><b>Datum: </b>14.08.2012 \
05:15</td></tr></table><table border=0 cellspacing=0  cellpadding=0 width="100%" \
class="header-part2"><tr><td><b>An: </b>research@vulnerability-lab.com</td></tr></table><br> \
Dear "><[PERSISTENT INJECTED SCRIPT CODE OUTSIDE OF GREETINGSCARD ITSELF!]") <,<br/><br/> \
Greetings! "><"><[PERSISTENT INJECTED SCRIPT CODE OUTSIDE OF GREETINGSCARD ITSELF!]") < has \
just sent you a eCard.  <br/><br/>
<a href="https://www.paypal-plaza.com/giftcard/2494/lang/en_au">View your eCard now.</a>
</body>
</html>



Solution:
=========
2012-10-29:	Vendor Fix/Patch by PayPal Inc


Risk:
=====
The security risk of the persistent input validation vulnerability in the mail notification \
service filter is estimated as medium.


Credits:
========
Vulnerability Laboratory [Research Team]  -    Benjamin Kunz Mejri (bkm@vulnerability-lab.com)


Disclaimer:
===========
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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    				   	Copyright  © 2012 | Vulnerability Laboratory



-- 
VULNERABILITY RESEARCH LABORATORY
LABORATORY RESEARCH TEAM
CONTACT: research@vulnerability-lab.com


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