source: http://www.securityfocus.com/bid/32706/info

Professional Download Assistant is prone to an SQL-injection vulnerability because it fails to sufficiently sanitize user-supplied data before using it in an SQL query.

Exploiting this issue could allow an attacker to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database.

Professional Download Assistant 0.1 is vulnerable; other versions may be affected as well. 

The following example is available:

user: ZoRLu
password: ' or '