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Subject: [FD] Prezi Bug Bounty #7 - (Charts) Persistent Vulnerability
From: Vulnerability Lab <research () vulnerability-lab ! com>
Date: 2016-02-23 11:58:44
Message-ID: 56CC4974.2060603 () vulnerability-lab ! com
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Document Title:
===============
Prezi Bug Bounty #7 - (Charts) Persistent Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1725
Release Date:
=============
2016-02-23
Vulnerability Laboratory ID (VL-ID):
====================================
1723
Common Vulnerability Scoring System:
====================================
3.9
Product & Service Introduction:
===============================
Prezi is a cloud-based presentation software based on a software as a service model. The \
product employs a zooming user interface (ZUI), which allows users to zoom in and out of their \
presentation media, and allows users to display and navigate through information within a 2.5D \
or parallax 3D space on the Z-axis. Prezi was officially established in 2009 by co-founders \
Adam Somlai-Fischer, Peter Halacsy and Peter Arvai.
(Copy of the Wikipedia entry: https://en.wikipedia.org/wiki/Prezi)
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research team discovered an application-side input validation web \
vulnerability in the official Prezi online service web-application.
Vulnerability Disclosure Timeline:
==================================
2016-01-27: Researcher Notification & Coordination (Milan Solanki)
2016-01-27: Vendor Notification (Prezi.com Security Team - Bug Bounty Program)
2016-02-02: Vendor Fix/Patch (Prezi.com Developer Team)
2016-02-23: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
Prezi
Product: Online Service - Web Application 2015 Q4
Prezi
Product: Online Service - Web Application 2016 Q1
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Technical Details & Description:
================================
An application-side cross site scripting web vulnerability has been discovered in the official \
Prezi online service web-application. The security vulnerability allows remote attackers to \
inject own script code to the application-side of the affected application module.
The vulnerability is located in the presentation charts function on Prezi online service web \
application. Remote attackers with low privilege web-application user accounts are able to \
inject own malicious script code via POST method request. The injection point is the vulnerable \
charts data field. The request method to inject is POST and the vulnerability is located to \
the application-side of the vulnerable service.
The security risk of the application-side cross site vulnerability is estimated as medium with \
a cvss (common vulnerability scoring system) count of 3.9. Exploitation of the persistent \
input validation web vulnerability requires a low privilege web-application user account and \
low or medium user interaction. Successful exploitation of the vulnerability results in \
session hijacking, persistent phishing attacks, persistent external redirects to malicious \
source and persistent manipulation of affected or connected application modules.
Proof of Concept (PoC):
=======================
The security vulnerability can be exploited by remote attackers with low privilege \
web-application user account and low or medium user interaction. For security demonstration or \
to reproduce the vulnerability follow the provided information and steps below to continue.
PoC: Payload
<--`<img/src=` onerror=alert(document.cookie)> --!>
Manual steps to reproduce the vulnerability ...
1. Create new presentation
2. Select the charts function
3. Go to Data Field
4. There are 4 function by default (online, email, seo & social)
-
5. Save the cross site scripting payload as the chart
6. Save the presentation and send to the victim
7. Victim try to re-edit the chart and visit the Data field
8. Thats it XSS executed In victim account also
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the vulnerable fields. \
Restrict the input and disallow usage of special chars. Filter and setup a secure exception \
handling that prevents the persistent execution in the output location.
Security Risk:
==============
The security risk of application-side input validation web vulnerability in the frontend of the \
Prezi web-application is estimated as medium. (CVSS 3.9)
Credits & Authors:
==================
Milan Solanki - [http://www.vulnerability-lab.com/show.php?user=Milan%20A%20Solanki]
Disclaimer & Information:
=========================
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