source: https://www.securityfocus.com/bid/4618/info

Blahz-DNS is a web based management tool for DNS information. It is implemented in PHP, and available for Linux systems.

By directly calling scripts included with Blahz-DNS, it is possible to bypass the authentication check, gaining full access to the Blahz-DNS tool.

http://www.example.com/dostuff.php?action=modify_user