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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::Auxiliary
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  include Msf::Exploit::Remote::Tcp
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  include Msf::Auxiliary::Scanner
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  include Msf::Auxiliary::Report
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  def initialize(info={})
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    super(update_info(info,
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      'Name'        => 'SerComm Network Device Backdoor Detection',
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      'Description' => %q{
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        This module can identify SerComm manufactured network devices which
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        contain a backdoor, allowing command injection or account disclosure.
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      },
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      'Author'         =>
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        [
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          'Eloi Vanderbeken <eloi.vanderbeken[at]gmail.com>', # Initial discovery, poc
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          'Matt "hostess" Andreko <mandreko[at]accuvant.com>' # Msf module
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        ],
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        'License'     => MSF_LICENSE,
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        'References'     =>
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        [
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          [ 'CVE', '2014-0659' ],
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          [ 'OSVDB', '101653' ],
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          [ 'URL', 'https://github.com/elvanderb/TCP-32764' ]
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        ],
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        'DisclosureDate' => '2013-12-31' ))
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    register_options([
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        Opt::RPORT(32764)
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      ])
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  end
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  def do_report(ip, endianness)
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    report_vuln({
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      :host => ip,
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      :port => rport,
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      :name => "SerComm Network Device Backdoor",
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      :refs => self.references,
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      :info => "SerComm Network Device Backdoor found on a #{endianness} device"
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    })
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  end
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  def run_host(ip)
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    begin
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      connect
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      sock.put(Rex::Text.rand_text(5))
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      res = sock.get_once
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      disconnect
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      if (res && res.start_with?("MMcS"))
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        print_good("#{ip}:#{rport} - Possible backdoor detected - Big Endian")
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        do_report(ip, "Big Endian")
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      elsif (res && res.start_with?("ScMM"))
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        print_good("#{ip}:#{rport} - Possible backdoor detected - Little Endian")
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        do_report(ip, "Little Endian")
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      else
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        vprint_status("#{ip}:#{rport} - Backdoor not detected.")
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      end
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    rescue Rex::ConnectionError => e
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      vprint_error("#{ip}:#{rport} - Connection failed: #{e.class}: #{e}")
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    end
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  end
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end
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