Authentix Authentication Vulnerability

Authentix is a website protection package available from Flicks Software.

Authentix uses a web form-based, cookie free, authentication mechanism that protects all files on websites by validating user input against a stored database. By using special characters in a URL combined with some special circumstances an attacker could bypass the Authentix authentication login prompt and view files on the web server.

Normally, a user enters http://my.secured.server/protected-directory/filename.ext and is then prompted for a username and password. In order to bypass the authentication mechanism, a user can enter the following URL with the appropriate information substituted:


Please note the . after the protected-directory entry. Through trial and error, it is relatively trivial to guess the protected-directory and the default - filename.ext and then gain read access to the files. Some files, such as images, are not viewable.


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