The remote web server contains a PHP script that is susceptible to a local file inclusion attack.
The remote host is running PBLang, a bulletin board system that uses flat files and is written in PHP. The version of PBLang installed on the remote host fails to sanitize user input to the 'lang' parameter before using it to include PHP code in 'login.php'. Regardless of PHP's 'register_globals' setting, an unauthenticated remote attacker may be able to exploit this issue to view arbitrary files or to execute arbitrary PHP code on the remote host, subject to the privileges of the web server user ID.
No solution is known at this time.