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Flowdock API Bug Bounty #3 - (Invite) Persistent Web Vulnerability

From: Vulnerability Lab <research () vulnerability-lab com>
Date: Mon, 28 Sep 2015 10:18:24 +0200
Document Title:
===============
Flowdock API Bug Bounty #3 - (Invite) Persistent Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1574


Release Date:
=============
2015-09-24


Vulnerability Laboratory ID (VL-ID):
====================================
1574


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


Product & Service Introduction:
===============================
Chat & inbox for teams.. One place to talk and stay up-to-date. Flowdock is a team collaboration app for desktop, 
mobile & web.
Work on things that matter, be transparent and solve problems across tools, teams & time zones. Try it for free for 30 
days. Keeping Flowdock`s 
environment and customer data safe and secure is a top priority for us. Find more details on our Help pages. Don`t 
hesitate to contact us 
at support () flowdock com should you have any questions about Flowdock`s security.

(Copy of the Vendor Homepage:  https://www.flowdock.com/security )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered an application-side input validation web vulnerability in the 
official Flowdock online service web-application.


Vulnerability Disclosure Timeline:
==================================
2015-08-16: Researcher Notification & Coordination (Benjamin Kunz Mejri)
2015-08-17: Vendor Notification (Flowdock Security Team - Bug Bounty Program)
2015-08-17: Vendor Response/Feedback (Flowdock Security Team - Bug Bounty Program)
2015-08-18: Vendor Fix/Patch (Flowdock Developer Team)
2015-09-24: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Rally Software
Product: Flowdock - Online Service (Web-Application) [API] 2015 Q3


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


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


Technical Details & Description:
================================
An application-side input validation web vulnerability has been discovered in the official Flowdock online-service 
web-application. 
The vulnerability allows remote attackers to inject own malicious script codes to the application-side of the 
vulnerable context function or service module.

The vulnerability is located in the flow name and flow description values of the Invite your Team (Flowdock Rest API) 
module POST method request. 
Remote attackers with low privilege application user accounts are able to inject own malicious script codes to the 
application-side of the service. 
The request method to inject malicious context is POST and the attack vector is located on the application-side of the 
flowdock api web-service. 

Remote attackers are able to inject malicious script codes to the application-side to compromise flowdock rest api 
dashboard (messages) by session 
manipulation or session evasion attacks. The attacker inject via name and description values malicious payloads which 
demonstrates the injection point 
and the execution point is in the insecure validated message inbox of the main deashboard.

The security risk of the persistent input validation web vulnerability is estimated as medium with a cvss (common 
vulnerability scoring system) count of 3.8. 
Exploitation of the persistent input validation web vulnerability requires a low privilege web-application user account 
and low user interaction. 
Successful exploitation of the vulnerability results in session hijacking, persistent phishing attacks, persistent 
redirect to external sources 
and persistent manipulation of affected or connected service module context.

Request Method(s):
                                [+] POST

Vulnerable Module(s):
                                [+] Invite your Team (Flowdock Rest API)

Vulnerable Parameter(s):
                                [+] Flow Name
                                [+] Flow Description


Proof of Concept (PoC):
=======================
The security vulnerability can be exploited by remote attackers with low privilege application user account and low 
user interaction.
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below 
to continue.

Manual steps to reproduce the vulnerability ...
1. Login to your account at the flowdock website
2. Surf to the main dasboard module
3. Click the invite your team button
4. Switch to the flow menu bar
5. Inject malicious script code test payload to the name and description of flowdock inputs via api
6. Save the input and return back to the module by refresh or cancel after update
7. The code executes in the message board but also in the message dasboard index were the user has been invited to 
grant access
8. Successful reproduce of the vulnerability in flowdock api and main dashbaord!

Note: Use tamper data in mozilla to manipulate the session values and to approve the existence of the vulnerability!



Execution Point:
https://www.flowdock.com/app/vulnerability-lab/main
https://www.flowdock.com/app/vulnerability-lab/main/messages/6

Inject Point via Invite:
https://www.flowdock.com/app/vulnerability-lab/main/settings/people 

https://www.flowdock.com/app/vulnerability-lab/main/settings/flow
Flow description  & Flow description



PoC: 
                ../(Vulnerability Lab) - Flowdock.htm
                ../(Vulnerability Lab) - Flowdock_2.htm


--- PoC Session Logs [POST] ---

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14:45:41.389[279ms][total 279ms] Status: 200[OK]
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      x-content-type-options[nosniff]
      content-security-policy[default-src *;script-src https://d2cxspbh1aoie1.cloudfront.net 
https://www.google-analytics.com https://gdata.youtube.com https://api.twitter.com;style-src 
https://d2cxspbh1aoie1.cloudfront.net 'unsafe-inline' 'unsafe-eval';object-src 
https://d2cxspbh1aoie1.cloudfront.net;frame-src 'self' flowdock:;child-src 'self' flowdock:;referrer origin]
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Set-Cookie[_flowdock_session=VnQzQ1RBbkVDMmQ3ZmVXZklGNW9sTHFsbWp3c0xlQjF3YlRFeUQwTWlFWXFxeDRvQU5PaDBNdDdvdzBZZmNwRkFpYmRJcE4xUTEydEtMZ3ErTHdYMkEwZXphT1NjQ1F4MmVrRlV1ZE9NY2NGdXFIRW81L2ZBb01DZlZJMExmWkdCUnNocHIxeWNJLzQ4bVFwbmhJOUVaMGFmVXNlQWJhT2R5czRIWE0xVGZmVzMyeWQ4RkdUcVVuWXByV29Lckt4RUl6Ykk1bDhSaFNXZjV0RXBoaFFwWVlkK2RhT3E2UVlQUTc3VFJMZ0tCTURqQ1Q5c3NaVDZKT0JxS21Wakp2Ti0tcmhuOFZqbEtua09xNzNsMWtDZy85UT09--063bdbee4c665a6e03a170925d30d12df58df57f;
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14:45:49.880[260ms][total 260ms] Status: 200[OK]
GET https://www.flowdock.com/app/vulnerability-lab/main/settings/a Load Flags[LOAD_DOCUMENT_URI  ] Größe des 
Inhalts[756] Mime Type[text/html]
   Request Header:
      Host[www.flowdock.com]
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      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      Referer[https://www.flowdock.com]
      
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      Connection[keep-alive]
   Response Header:
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      status[200 OK]
      Strict-Transport-Security[max-age=31557600]
      X-Frame-Options[SAMEORIGIN]
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https://www.google-analytics.com https://gdata.youtube.com https://api.twitter.com;style-src 
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Set-Cookie[_flowdock_session=M09RT1dSU3ZoQk9lcmlUREhROXZ3RmJwdlVnRnJOTkJuU1FSanFna09hTldEaENtYlhMWU9XVVl6Q3dhNFFVcXBKaGs3OG8rbTQ2VnBXSXRtbU5UM3haNmJWQWJacTBEV0ZqTTA5REdjYWIzMGpqT2xndUt5VzU4bmR2ejhWSjdxMk45Y2t6cWRyTVNDekxmRzVyQVU4WmorM0ovdi9GSVJwaE1PRHVQSlRRNTdGM0twUnUrbzZRYmx3cHhqa3ptRTNIRHIxM2NtRTNRN3hGaUtRRElxU1plczQ5K1hpYkVxbGM5UHRXVHpYbUNDc2RuWUJHbFY3a1hTU0p2VysxRy0tQllaZnY4eDdaVmhOaHZueTV3NzMvQT09--a5e6cfd8baf54325068065a49e96c3f11390cfeb;
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Reference(s):
https://www.flowdock.com/
https://www.flowdock.com/rest/organizations
https://www.flowdock.com/rest/flows/vulnerability-lab/main
https://www.flowdock.com/app/vulnerability-lab/main/settings/


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the vulnerable flow name or description name input 
fields.
Restrict the input and the parameter request to prevent persistent script code injection to the main dashboard module.
Filter the context of the output value in the message, treat link and chat inbox module to finally resolve the zero-day 
vulnerability.


Security Risk:
==============
The security risk of the application-side vulnerability in the flowdock online service web-application is estimated as 
medium. (CVSS 3.8)


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


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