source: https://www.securityfocus.com/bid/17116/info

DSDownload is prone to multiple SQL-injection vulnerabilities. The application fails to properly sanitize user-supplied input before using it in SQL queries.

This will allow an attacker to inject arbitrary SQL logic into the vulnerable parameters and scripts. As a result, the attacker may be able to access or modify sensitive information, compromise the application, or even compromise the underlying database. Other attacks are possible.

http://www.example.com/dsdownload/downloads.php? category=999'% 20union%20select% 206,2,3,4,5, 1,7,8/*