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[Full-disclosure] PayPal Inc Bug Bounty #42 - Persistent POST Inject Vulnerability
- To: full-disclosure@xxxxxxxxxxxxxxxxx
- Subject: [Full-disclosure] PayPal Inc Bug Bounty #42 - Persistent POST Inject Vulnerability
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 19 Nov 2013 04:21:56 +0100
Document Title:
===============
PayPal Inc Bug Bounty #42 - Persistent POST Inject Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=801
PayPal Security UID: kxy1ea5ech
Release Date:
=============
2013-11-18
Vulnerability Laboratory ID (VL-ID):
====================================
801
Common Vulnerability Scoring System:
====================================
3.5
Product & Service Introduction:
===============================
Als spezialisierte Factoringgesellschaft für die Abwicklung von
Rechnungskauf-Zahlungen im Internet wurde die BillSAFE GmbH 2008
durch die Altgesellschafter der mediafinanz AG gegründet. Das Management der
BillSAFE GmbH besteht ausnahmslos aus Risikomanagement-Experten
mit jahrelanger Erfahrung aus der Betreuung von namhaften Online-Shops und
Versandhandelsunternehmen.
2009 erfolgte die reguläre Inbetriebnahme des Services mit der Anbindung der
ersten 100 Online-Shops. 2010 beteiligte sich die eBay Tochter PayPal
im Rahmen einer strategischen Partnerschaft an der BillSAFE GmbH. 2011 wurde
ein neuer Unternehmensstandort auf dem eBay Campus in Berlin Dreilinden
eröffnet, um die enge operative Zusammenarbeit mit PayPal weiter zu
intensivieren. Seit Dezember 2011 ist die BillSAFE GmbH ein 100%iges PayPal
Unternehmen und Teil der eBay Firmengruppe. Die von BillSAFE angebotenen
Produkte bündeln die Erfahrung aus der Abwicklung von mehreren hundert
Millionen E-Commerce Transaktionen durch PayPal mit der Expertise in der
Bearbeitung von mehreren Millionen Inkassofällen durch die mediafinanz AG.
(Copy of the Vendor Homepage: http://www.billsafe.de/company/about )
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a POST inject web
vulnerability in the official Paypal Inc Billsafe online payment service
web-application.
Vulnerability Disclosure Timeline:
==================================
2012-12-27: Researcher Notification & Coordination (Benjamin Kunz Mejri)
2013-12-28: Vendor Notification (PayPal Site Security Team - Bug Bounty
Program)
2013-01-04: Vendor Response/Feedback (PayPal Site Security Team - Bug
Bounty Program)
2013-11-15: Vendor Fix/Patch (PayPal Developer Team - Bug Bounty Reward)
2013-11-16: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
PayPal Inc
Product: BillSafe - Online Payment Service 2012 Q4
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Technical Details & Description:
================================
A remote POST inject web vulnerability has been discovered in the official
Paypal Inc Billsafe online payment service web-application.
The issue allows remote attackers to inject via POST method request own
malicious persistent script codes to compromise the application.
The vulnerability is located in the integration center module. Remote attackers
can manipulate the POST method request of the
vulnerable `Register to download formular`. The vulnerable application values
are company (firma), `firstname (vorname),
`lastname (nachname)` and `shop-url`. The server accepts the manipulated POST
context and saves all details as html in the
application dbms for future usage. The security risk of the POST inject web
vulnerability with persistent attack vector is
estimated medium with a cvss (common vulnerability scoring system) count of
3.5(+).
The input does not validate the saved context and the input fields are not
restricted to prevent future executions.
Whenever an attacker is processing to include malicious context the request via
POST method will be accepted by the
server without secure encoding procedure.
Exploitation of the POST inject web vulnerability requires no privileged web
application user account and low or medium user interaction.
Successful exploitation of the client-side cross site scripting web
vulnerabilities results in session hijacking, client-side phishing,
client-side unauthorized/open (external) redirects and client-side manipulation
of the exception module context.
Vulnerable Service(s):
[+] Paypal - BillSafe
Vulnerable Section(s):
[+] Integration Center (Integrations Center)
Vulnerable Module(s):
[+] Register to download Formular (Registration
zum Formular download)
Vulnerable Parameter(s):
[+] Firma (company)
[+] Vorname (firstname)
[+] Nachname (lastname)
[+] Shop-URL
Proof of Concept (PoC):
=======================
The post inject web vulnerability can be exploited by remote attackers without
privileged application user account and with low or medium
user interaction. For security demonstration or to reproduce the vulnerability
follow the information below ...
--- PoC Session Request Logs [POST] ---
Host=www.billsafe.de
User-Agent=Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20100101
Firefox/17.0
Accept=text/html, */*; q=0.01
Accept-Language=de-de,de;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding=gzip, deflate
DNT=1
Connection=keep-alive
Content-Type=application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With=XMLHttpRequest
Referer=http://www.billsafe.de/integration-center/shop-systems
Content-Length=427
Cookie=__utma=22145316.759281629.1356643963.1356643963.1356643963.1;
__utmb=22145316.25.9.1356643975887;
__utmc=22145316;
__utmz=22145316.1356643963.1.1.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=billsafe%20paypal;
PHPSESSID=2qhldnsb86c71flbko91cofc85
Pragma=no-cache
Cache-Control=no-cache
POSTDATA=
company=%3E%22+'[INJECTED SCRIPT CODE!])+%3C&firstname=%3E%22+'[INJECTED SCRIPT
CODE!])+%3C&lastname=%3E%22+'[INJECTED SCRIPT CODE!])
+%3C&email=admin%40vulnerability-lab.com&shopUrl=http%3A%2F%2Fwww.%3E%22+'[INJECTED
SCRIPT CODE!])+%3C.de
+&terms=1&version=1337(6)&system=4&validate=true&format=html
--- Response Header [200] ---
Status=OK - 200
Date=Thu, 27 Dec 2012 21:47:11 GMT
Server=Apache
Cache-Control=max-age=2592000
Expires=Sat, 26 Jan 2013 21:47:11 GMT
Vary=Accept-Encoding
Content-Encoding=gzip
Content-Length=511
Keep-Alive=timeout=15, max=68
Connection=Keep-Alive
Content-Type=text/html
Reference(s):
http://www.billsafe.de/integration-center/shop-systems > [Download]
http://www.billsafe.de/integration-center/api-sdk > [Download]
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse of the vulnerable values in
the POST method request.
Also encode and parse the output of the vulnerable values even if the input has
already been encoded and restricted.
Security Risk:
==============
The security risk of the POST inject web vulnerability in the register to
download formular module is estimated as medium.
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri
(bkm@xxxxxxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]
Disclaimer & Information:
=========================
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