Sitefinity CMS 9.2 - Cross-Site Scripting

# Exploit Title: Stored Cross Site Scripting (XSS) in Progress  Sitefinity CMS 9.2
# Date: Aug 31, 2017
# Exploit Author: Pralhad Chaskar
# Vendor Homepage: http://www.sitefinity.com/
# Tested on: Progress Sitefinity CMS 9.2 and lower
# CVE : NA

Vendor Description
------------------
Progress® Sitefinity™ is a content management and marketing analytics platform designed to maximize the agility needed to succeed in today’s rapidly changing digital marketplace. It provides developers and IT teams the tools they need to support enterprise-level digital marketing, optimizing the customer journey by delivering seamless personalized experiences across different technologies and devices. Progress is a trusted source for the digital marketing innovation needed to create transformative customer experiences that fuel business success.

Description
------------
Cross-Site Scripting (XSS) attacks are a type of injection, in which malicious scripts are injected into otherwise benign and trusted web sites. XSS attacks occur when an attacker uses a web application to send malicious code, generally in the form of a browser side script, to a different end user.

Vulnerability Class
--------------------
Cross-site Scripting (XSS) - https://www.owasp.org/index.php/Cross-site_Scripting_(XSS)

Proof of Concept
----------------
Below mentioned input fields aren't properly escaped. This could lead to an XSS attack that could possibly affect administrators, users, editor.

http://xx.sitefinity.com/Sitefinity/Pages
Parameter : Page Title
Method: POST

http://xx.sitefinity.com/Sitefinity/Content/News
Parameter : News Title
Method: POST

http://xx.sitefinity.com/Sitefinity/Content/List
Parameter : List Title
Method: POST

http://xx.sitefinity.com/Sitefinity/Content/Documents/LibraryDocuments/incident-request-attachments
Parameter : Document Title
Method: POST

http://xx.sitefinity.com/Sitefinity/Content/Images/LibraryImages/newsimages
Parameter : Image Title
Method: POST

http://xx.sitefinity.com/Sitefinity/Content/links
Parameter : Link Title
Method: POST

http://xx.sitefinity.com/Sitefinity/Content/Videos/LibraryVideos/default-video-library
Parameter : Video Title
Method: POST

Vendor Contact Timeline
------------------------
Discovered: October 16, 2016
Vendor Notification: October 18, 2016
Advisory Publication: Aug 31, 2017
Public Disclosure: Aug 31, 2017

Affected Targets
----------------
Sitefinity CMS 9.2 and lower

Solution
--------
Upgrade to Sitefinity CMS 10.1 to fix this issue.

Credits
-------
Pralhad Chaskar
Information Security Analyst
Help AG Middle East

References
----------
[1] Help AG Middle East http://www.helpag.com/
[2] Sitefinity CMS Version Notes http://www.sitefinity.com/product/version-notes