[<prev] [next>] [day] [month] [year] [list]
Message-ID: <543DA21B.4080201@vulnerability-lab.com>
Date: Wed, 15 Oct 2014 00:22:19 +0200
From: Vulnerability Lab <research@...nerability-lab.com>
To: bugtraq@...urityfocus.com, bugs@...uritytracker.com
Subject: PayPal Inc BB #98 MOS - Persistent Settings Vulnerability
Document Title:
===============
PayPal Inc BB #98 MOS - Persistent Settings Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=983
Release Date:
=============
2014-10-13
Vulnerability Laboratory ID (VL-ID):
====================================
983
Common Vulnerability Scoring System:
====================================
4.1
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 persistent input validation web vulnerability in the PayPal Inc core application api.
Vulnerability Disclosure Timeline:
==================================
2014-10-13: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
PayPal Inc
Product: Core Application 2013 Q2
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Technical Details & Description:
================================
A persistent input validation web vulnerability is detected in the official Paypal service application and common service api.
The vulnerability typus allows an attacker to inject own malicious script code in the vulnerable module on application side (persistent).
The vulnerability is located in the `Tools` section of the `Shipping` module when processing to request via POST method manipulated
`ShipFromInfo` values. Remote attackers can inject own persistent script code to execute the context from the ShipFromInfo
parameter in several of the settings listings. The shipping settings redisplays the context of the ShipFromInfo. The parameter
input is not parsed or secure encoded which results in the persistent execution in the next layer of the settings module itself.
The vulnerability is exploitable for stand alone user account but also for multi-accounts in paypal. The way of exploitation is
remote and the risk is high because of the following scenario. A remote attacker is able to inject the information to the profile
itself and can use the details to exchange with the manipulated shippingfrominfo which results also in the persistent execution
of the transaction bound user account (victim|target).
The security risk of the persistent vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 4.1.
Exploitation of the persistent vulnerability requires a low privilege paypal application user account and only low user interaction.
Successful exploitation of the vulnerability result in persistent session hijacking, persistent phishing, persistent external redirects,
persistent external malware loads via inject and persistent module web context manipulation.
Request Method(s):
[+] POST
Vulnerable Section(s):
[+] Paypal API - (https://www.paypal.com/en)
Vulnerable Module(s):
[+] Tools > Shipping
Vulnerable Parameter(s):
[+] ShipFromInfo
Affected Module(s):
[+] Settings Listing
Proof of Concept (PoC):
=======================
The persistent script code injection web vulnerability can be exploited by remote attackers with a low privileged paypal application user account and
low user interaction. For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.
PoC: Ship From Information
<div style="display: block;" id="ShipToPage" class="SettingsPage">
<h4><em>Ship From Information:</em></h4>
<table style="margin-left: 10px" cellpadding="2" cellspacing="0">
<tbody><tr>
<td colspan="2" id="ShipFromInfo" style="font-weight: bold">">""<[PERSISTENT INJECTED SCRIPT CODE!]
/>>"<[2nd PERSISTENT INJECTED SCRIPT CODE!]><br>5305352131</td>
</tr>
</tbody></table>
Manually Exploitation steps to reproduce ...
1. Register 2 verified or unverified paypal accounts
2. Login to the first account and go to the shipping information in the tools section
3. Open another window and switch to the profile settings were you include the shipping from information
4. Include the payload from the poc section to bypass the filter validation of the api
Recognize: Include the payload two times and split the both tags with 2 times %20!
5. Switch back to the first page in the tools section under shipping
6. Open the seperate edit setting button from the index listing
7. Go to the first menu point Ship From Information
8. On top of the listing the persistent injected script code from the main section will be executed within the context
9. #1 Successful reproduced ...! (Local)
10. Buy or sell an article to a customer and use the shipping from information details as location
11. After the buyer or seller get the information of the used shiping details he can review the details ShipFromInfo
12. The persistent script code will be executed in the web context of the vulnerable module settings in the shipping details
13. #2 Successful reproduced ...! (Remote)
Reference(s):
https://ship.paypal.com/cgi-bin/shipweb?cmd=add-shipping-preset
https://ship.paypal.com/powership/shipping/js/requests/create-shipments-from-file.js?version=1_0_4
Solution - Fix & Patch:
=======================
Parse the output listing page of the settings website to patch the issue.
Encode and filter he ShipFromInfo parameter POST method request to fix the vulnerability and to prevent persistent script code injection attacks.
Security Risk:
==============
The security risk of the persistent input validation web vulnerability in the shipping application of paypal inc is estimated as medium.
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@...nerability-lab.com) [www.vulnerability-lab.com]
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.
Domains: www.vulnerability-lab.com - www.vuln-lab.com - www.evolution-sec.com
Contact: admin@...nerability-lab.com - research@...nerability-lab.com - admin@...lution-sec.com
Section: dev.vulnerability-db.com - forum.vulnerability-db.com - magazine.vulnerability-db.com
Social: twitter.com/#!/vuln_lab - facebook.com/VulnerabilityLab - youtube.com/user/vulnerability0lab
Feeds: vulnerability-lab.com/rss/rss.php - vulnerability-lab.com/rss/rss_upcoming.php - vulnerability-lab.com/rss/rss_news.php
Programs: vulnerability-lab.com/submit.php - vulnerability-lab.com/list-of-bug-bounty-programs.php - vulnerability-lab.com/register/
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 media, are reserved by
Vulnerability-Lab Research Team or its suppliers. All pictures, texts, advisories, source code, videos and other information on this website
is trademark of vulnerability-lab team & the specific authors or managers. To record, list (feed), modify, use or edit our material contact
(admin@...nerability-lab.com or research@...nerability-lab.com) to get a permission.
Copyright © 2014 | Vulnerability Laboratory [Evolution Security]
--
VULNERABILITY LABORATORY RESEARCH TEAM
DOMAIN: www.vulnerability-lab.com
CONTACT: research@...nerability-lab.com
Powered by blists - more mailing lists