Exploit-DB #34957
Description: PayPal Inc BB #85 MB iOS 4.6 - Authentication Bypass
Type: webapps
Platform: ios
Date: 2014-10-14
Author: Vulnerability-Lab

Exploit:
Document Title:
===============
PayPal Inc BB #85 MB iOS 4.6 - Auth Bypass Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=895

PayPal Security UID: Vxda0S

Video: http://www.vulnerability-lab.com/get_content.php?id=1338

View: https://www.youtube.com/watch?v=RXubXP_r2M4


Release Date:
=============
2014-10-09


Vulnerability Laboratory ID (VL-ID):
====================================
895


Common Vulnerability Scoring System:
====================================
6.2


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.
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 Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a security auth protection mechanism bypass vulnerability in the PayPal Inc iOS Mobile Application.


Vulnerability Disclosure Timeline:
==================================
2014-10-09:	Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
PayPal Inc
Product: iOS Mobile Application - Banking 4.6.0 


Exploitation Technique:
=======================
Remote


Severity Level:
===============
High


Technical Details & Description:
================================
An auth restriction bypass vulnerability has been discovered in the official PayPal Inc mobile webapplication and api. 
The vulnerability allows to bypass a filter or restrction of the online-service to get unauthorized paypal account access.

The security vulnerability is located in the mobile api auth procedure of the paypal online-service. The mobile app api does not 
check for already restricted/blocked application accounts. Remote attackers are able to login through the mobile api with paypal 
portal restriction to access account information or interact with the compromised account.

If a paypal user tries several times to login with a wrong password/user combination the paypal account will temporarily be closed 
for security reasons. When this happens the user needs to answer a secret question to get the account open again. Even if the account 
is temporarily closed it is possible to get access to the account via the paypal mobile app client through the API. 

The client API checks only if the account exists, the API does not check a part- or full blocking of the account. It is possible for 
the blocked user to get access to his paypal account and is able to make transactions and he can send money from the account. The mobile 
iPhone / iPad Paypal App does need a security upgrade to ensure that the status of an account is also verified and how the App reacts when 
such an event takes place. This would ensure that no one can have access via the mobile client to a blocked account. In the Paypal database 
there are several preferences for a