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PayPal GP+ Cross Site Scripting

PayPal GP+ Cross Site Scripting
Posted Mar 29, 2013
Authored by Ibrahim El-Sayed | Site vulnerability-lab.com

The PayPal GP+ service application for analyzing websites suffered from a persistent cross site scripting vulnerability.

tags | exploit, xss
MD5 | 8b9b0ec34469b618d47df0ad6b1a69ef

PayPal GP+ Cross Site Scripting

Change Mirror Download
Paypal Bug Bounty #46 - Persistent Web Vulnerability



PayPal Security UID: esj1f86plc


Common Vulnerability Scoring System:

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/ )

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

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


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



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 ...

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

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

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

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.

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Copyright © 2013 | Vulnerability Laboratory

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