Microsoft Defender Antimalware Platform 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("1.3.6.1.4.1.25623.1.0.816869");
  script_version("2024-02-19T14:37:31+0000");
  script_cve_id("CVE-2020-0835");
  script_tag(name:"cvss_base", value:"7.2");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:L/Au:N/C:C/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:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2020-04-22 20:19:00 +0000 (Wed, 22 Apr 2020)");
  script_tag(name:"creation_date", value:"2020-04-15 08:39:55 +0530 (Wed, 15 Apr 2020)");
  script_name("Microsoft Defender Antimalware Platform 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 Defender
  Antimalware Platform dated 14th April 2020");

  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 Windows Defender antimalware
  platform improperly handles hard links.");

  script_tag(name:"impact", value:"Successful exploitation will allow an attacker
  to overwrite a targeted file leading to an elevated status.");

  script_tag(name:"affected", value:"Microsoft Windows Defender Antimalware Platform.");

  script_tag(name:"solution", value:"Run the Windows Update to update the windows
  antimalware platform 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-2020-0835");

  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");
include("secpod_smb_func.inc");

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);

key = "SOFTWARE\Microsoft\Windows Defender";
if(!registry_key_exists(key:key)){
  exit(0);
}

path = registry_get_sz(key:key, item:"InstallLocation");
if(!path){
  exit(0);
}

exeVer = fetch_file_version(sysPath:path, file_name:"MpCmdRun.exe");
if(exeVer)
{
  if(version_is_less(version:exeVer, test_version:"4.18.2001.112"))
  {
    report = report_fixed_ver(installed_version:exeVer, fixed_version: "4.18.2001.112");
    security_message(data:report);
    exit(0);
  }
}
exit(0);