Kentico CMS 7.0.75 - User Information Disclosure

# Exploit Title: Kentico CMS User Enumeration Bug
# Google Dork: inurl:/CMSPages/logon.aspx <-- enumerates several Kentico
CMS sites
# Date: 02-25-2014
# Exploit Author: Charlie Campbell and Lyndon Mendoza
# Vendor Homepage: http://www.kentico.com/
# Software Link: http://www.kentico.com/Download-Demo/Trial-Version
# Version: [Version 7.0.75 and previous versions]

This vulnerability is an unprotected page on the site where you can view
all current users and usernames.
To find out if a Kentico CMS is vulnerable go to

http://site.com/CMSModules/Messaging/CMSPages/PublicMessageUserSelector.aspx

assuming that the Kentico CMS was installed to the root folder in the
server.

I have already notified the authors and security team for Kentico CMS, in
their response they claimed they would issue a patch on 02-21-2014.