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PayPal Persistent Listing Cross Site Scripting

PayPal Persistent Listing Cross Site Scripting
Posted Nov 30, 2012
Authored by Benjamin Kunz Mejri | Site vulnerability-lab.com

PayPal suffered from a persistent cross site scripting vulnerability.

tags | exploit, xss
MD5 | 3e5e7d726ff45caa32c8441e05e68b0c

PayPal Persistent Listing Cross Site Scripting

Change Mirror Download
Title:
======
Paypal BugBounty #2 - Persistent Listing Web Vulnerability


Date:
=====
2012-11-26


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=634


VL-ID:
=====
634


Common Vulnerability Scoring System:
====================================
4


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 4–9, 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 ecommerce website application.


Report-Timeline:
================
2012-06-30: Researcher Notification & Coordination
2012-06-30: Vendor Notification
2012-07-02: Vendor Response/Feedback
2012-10-29: Vendor Fix/Patch by PayPal Inc
2012-11-27: Public or Non-Public Disclosure


Status:
========
Published


Affected Product(s):
====================
PayPal Inc
Payment System - Core Application 2012 Q3-4


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


Severity:
=========
High


Details:
========
A persistent input validation vulnerability is detected in the official Paypal ecommerce website content management system.
The bugs allow remote attackers to implement/inject malicious script code on the application side (persistent). The persistent
vulnerability is located in the Artikel pro Seite listing module with the bound vulnerable filterVal1 parameter. Remote exploitation
requires low user inter action or privileged application user account for local exploitation. Successful exploitation of the
vulnerability can lead to session hijacking (admin), account steal via persistent web attack or stable (persistent) context manipulation.

Vulnerable Module(s):
[+] Geld Anfordern > Artikel pro Seite (Listing) > Rechnungen verwalten


Vulnerable Parameter(s):
[+] filterVal1 - Item Index (Listing)


Proof of Concept:
=================
The persistent vulnerability can be exploited by remote attackers & local privileged user accounts with low required user inter action.
For demonstration or reproduce ...

Review: [ALL Listing] (index) Rechnungen Verwalten - Geld Anfordern > Artikel pro Seite (Listing) > filterVal1

var currencyVals = ["EUR", "AUD", "BRL", "GBP", "DKK", "HKD", "ILS", "JPY", "CAD", "MXN", "TWD", "NZD", "NOK", "PHP",
"PLN", "SEK", "CHF", "SGD", "THB", "CZK", "HUF", "USD", ""];
var txt1 = "zwischen";
var txt2 = " und ";
var txtLabel = "Wert 2";
var advFilter = "email";
var dateFilter = "invoice_date";
var filterVal1 = "<[PERSISTENT INJECTED SCRIPT CODE!]
;"> <META HTTP-EQUIV="Set-Cookie"
Content="USERID=<[PERSISTENT INJECTED SCRIPT CODE!]>



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


Risk:
=====
The security risk of the persistent script code inject vulnerability 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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Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability Laboratory.
Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other
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Copyright © 2012 | Vulnerability Laboratory



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CONTACT: research@vulnerability-lab.com

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