PayPal JDWP Remote Code Execution

`Document Title:  
===============  
PayPal Inc Bug Bounty #114 - JDWP Remote Code Execution Vulnerability  
  
  
References (Source):  
====================  
http://www.vulnerability-lab.com/get_content.php?id=1474  
  
Video: http://www.vulnerability-lab.com/get_content.php?id=1474  
  
Vulnerability Magazine: http://magazine.vulnerability-db.com/?q=articles/2015/04/28/paypal-inc-bug-bounty-jdwp-remote-code-execution-vulnerability  
  
  
Release Date:  
=============  
2015-04-28  
  
  
Vulnerability Laboratory ID (VL-ID):  
====================================  
1474  
  
  
Common Vulnerability Scoring System:  
====================================  
9.3  
  
  
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.  
  
(Copy of the Homepage: www.paypal.com) [http://en.wikipedia.org/wiki/PayPal]  
  
  
Abstract Advisory Information:  
==============================  
An independent Vulnerability Laboratory Researcher discovered a remote code execution vulnerability in the official PayPal Inc Marketing online-service web-application.  
  
  
Vulnerability Disclosure Timeline:  
==================================  
2015-04-05: Researcher Notification & Coordination (Milan A Solanki - Safehacking4mas)  
2015-04-06: Vendor Notification (PayPal Inc - Security & Bug Bounty Team)  
2015-04-07: Vendor Response/Feedback (PayPal Inc - Security & Bug Bounty Team)  
2015-04-09: Vendor Fix/Patch (PayPal Inc - Developer Team)  
2015-04-28: Public Disclosure (Vulnerability Laboratory)  
  
  
Discovery Status:  
=================  
Published  
  
  
Affected Product(s):  
====================  
PayPal Inc  
Product: Marketing Application & Service (HK) 2015 Q2  
  
  
Exploitation Technique:  
=======================  
Remote  
  
  
Severity Level:  
===============  
Critical  
  
  
Technical Details & Description:  
================================  
A remote code execution vulnerability has been discovered in the JDWP protocol of the PayPal Inc Marketing online service web-server.  
The vulnerability allows remote attackers to execute system specific code against a target system to compromise the webserver.  
  
The Java Debug Wire Protocol (JDWP) is the protocol used for communication between a debugger and the Java virtual machine (VM) which it   
debugs (hereafter called the target VM). JDWP is one layer within the Java Platform Debugger Architecture (JPDA). JDWP does not use any   
authentication and could be abused by an attacker to execute arbitrary code on the affected server.   
  
The tool that i used to disclose is the jdwp-shellifier. I scanned the marketing site and it had opened port 8000 (pre-auth) than i just   
executed after accepted connection my commands and finally disclosed a remote code execution issue.  
  
Vulnerable Protocol(s):  
[+] JDWP  
  
Port(s):  
[+] 8000  
  
  
Proof of Concept (PoC):  
=======================  
The remote code execution web vulnerability can be exploited by remote attackers without privileged application user account or user interaction.  
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.  
  
Manual steps to reproduce the security vulnerability ...  
1. Scan the site with the jdwp-shellifier tool (https://github.com/IOActive/jdwp-shellifier)  
2. Open port 8000 and connect to the service without auth  
3. Execute own server-side commands as root user  
4. Successful reproduce of the vulnerability!  
  
Note: Please watch the poc demo video!  
  
  
Solution - Fix & Patch:  
=======================  
2015-04-09: Vendor Fix/Patch (PayPal Inc - Developer Team)  
  
  
Security Risk:  
==============  
The security risk of the remote code execution vulnerability in the jdwp protocol is estimated as critical. (CVSS 9.3)  
  
  
Credits & Authors:  
==================  
Milan A Solanki - ([email protected]) [www.safehacking4mas.blogspot.in]  
  
  
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: [email protected] - [email protected] - [email protected]  
Section: magazine.vulnerability-db.com - vulnerability-lab.com/contact.php - evolution-sec.com/contact  
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   
([email protected] or [email protected]) to get a permission.  
  
Copyright © 2015 | Vulnerability Laboratory - [Evolution Security GmbH]™  
  
--   
VULNERABILITY LABORATORY - RESEARCH TEAM  
SERVICE: www.vulnerability-lab.com  
CONTACT: [email protected]  
PGP KEY: http://www.vulnerability-lab.com/keys/[email protected]%280x198E9928%29.txt  
  
`