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[Full-disclosure] PayPal Bug Bounty #26 - Persistent Web Vulnerabilities

Title:
======
PayPal Bug Bounty #26 -  Persistent Web Vulnerabilities


Date:
=====
2013-01-26


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=703

PayPal UID: wam19c8kxn


VL-ID:
=====
703


Common Vulnerability Scoring System:
====================================
4.5


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 4ñ9, 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 persistent Web 
Vulnerability in the official Paypal Community Forum Portal website application.


Report-Timeline:
================
2012-09-17:     Researcher Notification & Coordination
2012-09-17:     Vendor Notification
2012-10-22:     Vendor Response/Feedback
2012-12-14:     Vendor Fix/Patch
2013-01-26:     Public Disclosure


Status:
========
Published


Affected Products:
==================
PayPal Inc
Community Service Application 2012 Q4

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


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


Details:
========
A persistent web vulnerability is located in the official Paypal Community 
Forum Portal website application.
The bug allows remote attackers with low privileged application user account to 
inject via editor own 
malicious persistent script code. 

The vulnerabilities are located in the forum editor module with the bound 
vulnerable messageform & tag values. 
Remote attackers can compose malicious forum posts to hijack 
admin/moderator/customer accounts via the editor
spell checker function.

Successful exploitation result in local persistent web context manipulation, 
client side phishing or persistent 
session hijacking via messages body.


Vulnerable Module(s):
                                [+] Editor (in combination with the replace all 
function to execute)

Vulnerable Parameter(s):
                                [+] Message & Tags


Proof of Concept:
=================
The persistent vulnerability can be exploited by remote attackers with low 
privileged community account and with 
low or medium required user interaction. For demonstration or reproduce ...


Review: Editor Listing - Link & Spell Replace > Execution

<p>>"<<span style="" id="jS$6" class="j2">"></span> <span style="" id="jS$7" 
class="j2">"><iframe src="a" onload="alert("VL")" <"=""><[PERSISTENT INJECTED 
SCRIPT CODE!]) <</iframe></span>
=<span id="jS$12" class="j2">http</span>://<span id="jS$9" 
class="j2">global</span>-<span id="jS$10" class="j4">evolution.info
</span>/><span id="jS$11" class="j4">@gmail.com</span>

Session Time:   17:30 - 18:00
URL:            
https://www.paypal-community.com/t5/forums/postpage/board-id/US-Protections




Risk:
=====
The security risk of the persistent web vulnerability is estimated as 
medium(+)|(-)high.


Credits:
========
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri 
(bkm@xxxxxxxxxxxxxxxxxxxxx)


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===========
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