Title:
======
Paypal Bug Bounty #46 - Persistent Web Vulnerability


Date:
=====
2013-03-28


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=805

PayPal Security UID: esj1f86plc


VL-ID:
=====
805


Common Vulnerability Scoring System:
====================================
4.3


Introduction:
=============
PayPal offers, both companies and individuals, a simple, quick and innovative solution of receiving money and making payments online. 
In ten years time, this company has become an authority in this market. Online buyers, eBay vendors, online stores and even the traditional 
offline companies. The number of users who trust PayPal with their transactions, continues to grow. 175 million PayPal accounts worldwide 
are certainly proof of that. PayPal uses a unique and extremely advanced system to prevent fraud, which guarantees a completely reliable 
and safe solution for real time payments online.

GP+ objectively analyzes and assesses the quality and findablility of online stores and, at the same time, examines the possibilities to avoid 
attrition in the sales process. The base of this analysis is formed by: Google, Yahoo! and Microsoft Live, the W3C, Lipperhey in house research, 
governments, renowned trade publications, worldwide specialists pool and research done by PayPal into the characteristics of the most successful 
online stores worldwide.

(Copy of the Vendor Homepage:  https://www.paypal-gpplus.com/en/about/ )


Abstract:
=========
The Vulnerability Laboratory Research Team discovered a web session vulnerability in the official PayPal GP+ Web Application Service.


Report-Timeline:
================
2013-01-01:  Researcher Notification & Coordination
2013-01-02:  Vendor Notification
2013-01-12:  Vendor Response/Feedback
2013-03-26:  Vendor Fix/Patch
2013-03-28:  Public Disclosure


Status:
========
Published


Affected Products:
==================
PayPal Inc
Product: GP+ - Application Service 2013 Q1


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


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


Details:
========
A persistent input validation web vulnerability is detected in the official Paypal GP+ service application for anlayzing websites.

The vulnerability is located in the pop up message of the delete button where the name of the website, that has been analyzed, 
is not sanitized, hence the malicious code gets executed. The delete button is located in two different places which are 
`Recent  analysis` and `all analysis` listings. Exploitation of the vulnerability requires 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 vulnerable module web context manipulation.

Vulnerable Section(s):
        [+] Paypal GP+ - (https://www.paypal-gpplus.com/en/dashboard/all/)

Vulnerable Module(s):
        [+] Analyze a new website

Vulnerable Parameter(s):
        [+] Website field out of the pop up message

Affected Module(s):
        [+] Recent Analysis - All Analysis


Proof of Concept:
=================
The vulnerability can be exploited by remote attackers without user interaction and without privileged application user account.
For demonstration or reproduce ...

PoC: 
The attacker should go and insert the malicious code in the field of the website he would like to search it. After that, 
he should click on "Scan URL". The scan will generate an error because the url is invalid, but when the user goes back to his dashboard 
and choose Recent Analysis/All Analysis, and he stops with his mouse pointer no the delete icon in the page, the malicious code will be executed.


URL:  https://www.paypal-gpplus.com/en/dashboard/all/

Code Review:
<td> </td>
<td>
<a href="https://www.paypal-gpplus.com/en/dashboard/analysis/2727753/"><[PERSISTENT INJECTED SCRIPT CODE!]<</a>  
</td>
<td>
<div class="more-options">
</td>
<td colspan="6">An error has occurred!</td>
</tr>
<tr id="tr-2727749" class="tr-row">
<td> </td>
<td>
<a href="https://www.paypal-gpplus.com/en/dashboard/analysis/2727749/">"><[PERSISTENT INJECTED SCRIPT CODE!]</a>




Risk:
=====
The security risk of  the persistent input validation web vulnerability is estimated as medium(+).



Credits:
========
Vulnerability Laboratory [Research Team] - Ibrahim El-Sayed (the_storm) [storm@vulnerability-lab.com] [iel-sayed.blogspot.com]



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===========
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