Microsoft Windows: MS Security Guide: WDigest Authentication

# 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("1.3.6.1.4.1.25623.1.0.109307");
  script_version("2023-08-23T05:05:12+0000");
  script_tag(name:"last_modification", value:"2023-08-23 05:05:12 +0000 (Wed, 23 Aug 2023)");
  script_tag(name:"creation_date", value:"2018-06-15 11:51:43 +0200 (Fri, 15 Jun 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: MS Security Guide: WDigest Authentication");

  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: 18.4.8 (L1) Ensure 'WDigest Authentication' is set to 'Disabled'");
  script_xref(name:"Policy", value:"CIS Microsoft Windows 10 Enterprise (Release 2004) Benchmark v1.9.1: 18.3.6 (L1) Ensure 'WDigest Authentication' is set to 'Disabled'");
  script_xref(name:"Policy", value:"CIS Microsoft Windows Server 2019 RTM (Release 1809) Benchmark v1.1.0: 18.3.7 (L1) Ensure 'WDigest Authentication' is set to 'Disabled'");
  script_xref(name:"Policy", value:"CIS Controls Version 7: 16.4 Encrypt or Hash all Authentication Credentials");
  script_xref(name:"URL", value:"https://www.microsoft.com/en-us/download/confirmation.aspx?id=25250");

  script_tag(name:"summary", value:"When WDigest authentication is enabled, Lsass.exe retains a copy
of the user's plaintext password in memory, where it can be at risk of theft. Microsoft recommends
disabling WDigest authentication unless it is needed.

If this setting is not configured, WDigest authentication is disabled in Windows 8.1 and in Windows
Server 2012 R2, it is enabled by default in earlier versions of Windows and Windows Server.

Update KB2871997 must first be installed to disable WDigest authentication using this setting in
Windows 7, Windows 8, Windows Server 2008 R2 and Windows Server 2012.

Enabled: Enables WDigest authentication.

Disabled (recommended): Disables WDigest authentication. For this setting to work on Windows 7,
Windows 8, Windows Server 2008 R2 or Windows Server 2012, KB2871997 must first be installed.

(C) Microsoft Corporation 2015.");

  exit(0);
}

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

target_os = "Microsoft Windows 7 or later";
win_min_ver = "6.1";
title = "WDigest Authentication (disabling may require KB2871997)";
solution = "Set following UI path accordingly: Computer Configuration/Administrative Templates/MS Security Guide" + title;
type = "HKLM";
key = "SYSTEM\CurrentControlSet\Control\SecurityProviders\WDigest";
item = "UseLogonCredential";
reg_path = type + "\" + key + "!" + item;
test_type = "RegKey";
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);