Microsoft Windows: Restrict Unauthenticated RPC clients

##############################################################################
# OpenVAS Vulnerability Test
# $Id: win_unauth_rpc_client.nasl 11344 2018-09-12 06:57:52Z emoss $
#
# Check value for Restrict Unauthenticated RPC clients
#
# Authors:
# Emanuel Moss <[email protected]>
#
# Copyright:
# Copyright (c) 2018 Greenbone Networks GmbH, http://www.greenbone.net
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2
# (or any later version), as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
###############################################################################

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.109545");
  script_version("$Revision: 11344 $");
  script_tag(name:"last_modification", value:"$Date: 2018-09-12 08:57:52 +0200 (Wed, 12 Sep 2018) $");
  script_tag(name:"creation_date", value:"2018-08-07 14:04:55 +0200 (Tue, 07 Aug 2018)");
  script_tag(name:"cvss_base", value:"0.0");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:H/Au:S/C:N/I:N/A:N");
  script_tag(name:"qod", value:"97");
  script_name('Microsoft Windows: Restrict Unauthenticated RPC clients');
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (c) 2018 Greenbone Networks GmbH");
  script_family("Policy");
  script_dependencies("smb_reg_service_pack.nasl");
  script_add_preference(name:"Value", type:"radio", value:"1;0;2");
  script_mandatory_keys("Compliance/Launch");
  script_tag(name:"summary", value:"This test checks the setting for policy
'Restrict Unauthenticated RPC clients' on Windows hosts (at least Windows 8.1).

The setting controls how the RPC server runtime handles unauthenticated RPC clients connecting to
RPC servers.");
  exit(0);
}

include("smb_nt.inc");
include("policy_functions.inc");

if(!get_kb_item("SMB/WindowsVersion")){
  policy_logging(text:'Host is no Microsoft Windows System or it is not possible
to query the registry.');
  exit(0);
}

if(get_kb_item("SMB/WindowsVersion") < "6.3"){
  policy_logging(text:'Host is not at least a Microsoft Windows 8.1 system.
These setting only applies to Windows 8.1 or higher systems.');
  exit(0);
}

title = 'Restrict Unauthenticated RPC clients';
fixtext = 'Set following UI path accordingly:
Computer Configuration/Administrative Templates/System/Remote Procedure Call/' + title;
type = 'HKLM';
key = 'Software\\Policies\\Microsoft\\Windows NT\\Rpc';
item = 'RestrictRemoteClients';
default = script_get_preference('Value');
value = registry_get_dword(key:key, item:item, type:type);

if(value == ''){
  value = '0';
}

if(int(value) == int(default)){
  compliant = 'yes';
}else{
  compliant = 'no';
}

policy_logging(text:'"' + title + '" is set to: ' + value);
policy_add_oid();
policy_set_dval(dval:default);
policy_fixtext(fixtext:fixtext);
policy_control_name(title:title);
policy_set_kb(val:value);
policy_set_compliance(compliant:compliant);


exit(0);