Microsoft Defender Elevation of Privilege Vulnerability (Apr 2020)

# SPDX-FileCopyrightText: 2020 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("1.3.6.1.4.1.25623.1.0.816864");
  script_version("2024-02-19T14:37:31+0000");
  script_cve_id("CVE-2020-1002");
  script_tag(name:"cvss_base", value:"6.6");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:L/Au:N/C:N/I:C/A:C");
  script_tag(name:"last_modification", value:"2024-02-19 14:37:31 +0000 (Mon, 19 Feb 2024)");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2020-04-21 19:21:00 +0000 (Tue, 21 Apr 2020)");
  script_tag(name:"creation_date", value:"2020-04-15 08:39:55 +0530 (Wed, 15 Apr 2020)");
  script_name("Microsoft Defender Elevation of Privilege Vulnerability (Apr 2020)");

  script_tag(name:"summary", value:"This host is missing an important security
  update according to Microsoft Security Updates released for Microsoft Malware
  Protection Engine dated 23-09-2019");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host");

  script_tag(name:"insight", value:"The flaw exists when the MpSigStub.exe for Defender
  allows file deletion in arbitrary locations.");

  script_tag(name:"impact", value:"Successful exploitation will allow an attacker
  to run a specially crafted command that could exploit the vulnerability and delete
  protected files on an affected system once MpSigStub.exe ran again.");

  script_tag(name:"affected", value:"- Microsoft Windows Defender on Microsoft Windows 10 x32/x64

  - Microsoft Windows Server 2019

  - Microsoft Windows Server 2016

  - Microsoft Windows 7 x32/x64

  - Microsoft Windows 8.1 x32/x64

  - Microsoft Windows Server 2008 x32

  - Microsoft Windows Server 2008 R2 x64

  - Microsoft Windows Server 2012

  - Microsoft Windows Server 2012 R2");

  script_tag(name:"solution", value:"Run the Windows Update to update the malware
  protection engine to the latest version available. Typically, no action is
  required as the built-in mechanism for the automatic detection and deployment
  of updates will apply the update itself.");

  script_tag(name:"solution_type", value:"VendorFix");

  script_tag(name:"qod_type", value:"executable_version");
  script_xref(name:"URL", value:"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1002");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2020 Greenbone AG");
  script_family("Windows");
  script_dependencies("smb_reg_service_pack.nasl", "gb_wmi_access.nasl");
  script_require_ports(139, 445);
  script_mandatory_keys("SMB/WindowsVersion", "WMI/access_successful");

  exit(0);
}

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

if(hotfix_check_sp(win7:2, win7x64:2, win2008r2:2, win8_1:1, win8_1x64:1,win2012:1, win2012R2:1,
                   win10:1, win10x64:1, win2016:1, win2008:3, win2019:1) <= 0) {
  exit(0);
}

infos = kb_smb_wmi_connectinfo();
if(!infos)
  exit(0);

handle = wmi_connect(host:infos["host"], username:infos["username_wmi_smb"], password:infos["password"]);
if(!handle)
  exit(0);

query = "select Name from win32_Service WHERE Name Like '%WinDefend%' and state='Running'";
result = wmi_query(wmi_handle:handle, query:query);
wmi_close(wmi_handle:handle);
if(!result)
  exit(0);

def_version = registry_get_sz(key:"SOFTWARE\Microsoft\Windows Defender\Signature Updates", item:"EngineVersion");
if(!def_version)
  exit(0);

##First version of the Microsoft Malware Protection Engine with this vulnerability addressed 1.1.16638.0
if(version_is_less(version:def_version, test_version:"1.1.16638.0")) {
  report = report_fixed_ver(installed_version:def_version, fixed_version:"1.1.16638.0 or higher");
  security_message(port:0, data:report);
  exit(0);
}

exit(99);