Microsoft Windows: Configure Offer Remote Assistance

# SPDX-FileCopyrightText: 2018 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.109542");
  script_version("2023-08-25T05:06:04+0000");
  script_tag(name:"last_modification", value:"2023-08-25 05:06:04 +0000 (Fri, 25 Aug 2023)");
  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: Configure Offer Remote Assistance");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2018 Greenbone AG");
  script_family("Policy");
  script_dependencies("compliance_tests.nasl", "smb_reg_service_pack.nasl");
  script_mandatory_keys("Compliance/Launch");

  script_add_preference(name:"Value", type:"radio", value:"0;1", id:1);

  script_xref(name:"Policy", value:"CIS Microsoft Windows 10 Enterprise (Release 22H2) Benchmark v2.0.0: 18.9.34.1 (L1) Ensure 'Configure Offer Remote Assistance' is set to 'Disabled'");
  script_xref(name:"Policy", value:"CIS Microsoft Windows 10 Enterprise (Release 2004) Benchmark v1.9.1: 18.8.36.1 (L1) Ensure 'Configure Offer Remote Assistance' is set to 'Disabled'");
  script_xref(name:"Policy", value:"CIS Microsoft Windows Server 2019 RTM (Release 1809) Benchmark v1.1.0: 18.8.36.1 (L1) Ensure 'Configure Offer Remote Assistance' is set to 'Disabled'");
  script_xref(name:"Policy", value:"CIS Controls Version 7: 9.2 Ensure Only Approved Ports Protocols and Services Are Running");
  script_xref(name:"URL", value:"https://www.microsoft.com/en-us/download/confirmation.aspx?id=25250");

  script_tag(name:"summary", value:"This policy setting allows you to turn on or turn off Offer
(Unsolicited) Remote Assistance on this computer.

If you enable this policy setting, users on this computer can get help from their corporate technical
support staff using Offer (Unsolicited) Remote Assistance.

If you disable this policy setting, users on this computer cannot get help from their corporate
technical support staff using Offer (Unsolicited) Remote Assistance.

If you do not configure this policy setting, users on this computer cannot get help from their
corporate technical support staff using Offer (Unsolicited) Remote Assistance.

If you enable this policy setting, you have two ways to allow helpers to provide Remote Assistance:
'Allow helpers to only view the computer' or 'Allow helpers to remotely control the computer.'
When you configure this policy setting, you also specify the list of users or user groups that are
allowed to offer remote assistance.

If you enable this policy setting, you should also enable firewall exceptions to allow Remote
Assistance communications. The firewall exceptions required for Offer (Unsolicited) Remote
Assistance depend on the version of Windows you are running.

(C) 2015 Microsoft Corporation.");

  exit(0);
}

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

target_os = "Microsoft Windows 8.1 or later";
win_min_ver = "6.3";
title = "Configure Offer Remote Assistance";
solution = "Set following UI path accordingly:
Computer Configuration/Administrative Templates/System/Remote Assistance/" + title;
test_type = "RegKey";
type = "HKLM";
key = "Software\policies\Microsoft\Windows NT\Terminal Services";
item = "fAllowUnsolicited";
reg_path = type + "\" + key + "!" + item;
default = script_get_preference("Value");

if(!policy_verify_win_ver(min_ver:win_min_ver)){
  results = policy_report_wrong_os(target_os:target_os);
}else{
  results = policy_match_exact_reg_dword(key:key, item:item, type:type, default:default);
}

value = results["value"];
comment = results["comment"];
compliant = results["compliant"];

policy_reporting(result:value, default:default, compliant:compliant, fixtext:solution,
  type:test_type, test:reg_path, info:comment);
policy_set_kbs(type:test_type, cmd:reg_path, default:default, solution:solution, title:title,
  value:value, compliant:compliant);

exit(0);