source: http://www.securityfocus.com/bid/58911/info
         
PHP Address Book is prone to multiple SQL-injection vulnerabilities because it fails to sufficiently sanitize user-supplied input.
         
A successful exploit may allow an attacker to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database.
         
PHP Address Book 8.2.5 is vulnerable; other versions may also be affected. 

http://www.example.com/addressbook/register/checklogin.php?username={insert}&password=pass