source: http://www.securityfocus.com/bid/14873/info

NooToplist is prone to multiple SQL injection vulnerabilities. These issues are due to a failure in the application to properly sanitize user-supplied input.

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. 

http://www.example.com/index.php?o='[SQL INJECTION]
http://www.example.com/index.php?sort='[SQL INJECTION]