source: https://www.securityfocus.com/bid/19813/info

Autentificator is prone to an SQL-injection vulnerability because the application fails to properly sanitize user-supplied input before using it in an SQL query. 

A successful exploit could allow an attacker to compromise the application, access or modify data, or exploit vulnerabilities in the underlying database implementation.

Version 2.01 is vulnerable to this issue; other versions may also be affected.

http://www,example.com/aut_verifica.inc.php?user='+[SQL]&pass=something