source: http://www.securityfocus.com/bid/9689/info
    
Owl's Workshop is reported prone to multiple remote file-disclosure vulnerabilities because the application fails to validate user-supplied input passed via a URI parameter.
    
Upon successful exploitation of these issues, an attacker may be able to gain access to sensitive system files, potentially facilitating further attacks.

http://www.example.org/owls/readings/index.php?filename=/etc/passwd