Microsoft Word 2016 Security Feature Bypass Vulnerability (KB4486719)

# Copyright (C) 2020 Greenbone Networks GmbH
# 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-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# 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("1.3.6.1.4.1.25623.1.0.817833");
  script_version("2024-01-03T05:05:19+0000");
  script_cve_id("CVE-2020-17020");
  script_tag(name:"cvss_base", value:"2.1");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:L/Au:N/C:P/I:N/A:N");
  script_tag(name:"last_modification", value:"2024-01-03 05:05:19 +0000 (Wed, 03 Jan 2024)");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2023-12-31 19:15:00 +0000 (Sun, 31 Dec 2023)");
  script_tag(name:"creation_date", value:"2020-11-11 09:41:28 +0530 (Wed, 11 Nov 2020)");
  script_name("Microsoft Word 2016 Security Feature Bypass Vulnerability (KB4486719)");

  script_tag(name:"summary", value:"This host is missing an important security
  update according to Microsoft KB4486719");

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

  script_tag(name:"insight", value:"A security feature bypass vulnerability exists
  in Microsoft Word software when it fails to properly handle specially crafted
  Office file.");

  script_tag(name:"impact", value:"Successful exploitation will allow an attacker
  to conduct remote code execution.");

  script_tag(name:"affected", value:"Microsoft Word 2016.");

  script_tag(name:"solution", value:"The vendor has released updates. Please see
  the references for more information.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"executable_version");
  script_xref(name:"URL", value:"https://support.microsoft.com/en-us/help/4486719");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2020 Greenbone Networks GmbH");
  script_family("Windows : Microsoft Bulletins");
  script_dependencies("secpod_office_products_version_900032.nasl");
  script_mandatory_keys("SMB/Office/Word/Version");
  exit(0);
}


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

exeVer = get_kb_item("SMB/Office/Word/Version");
if(!exeVer){
  exit(0);
}

exePath = get_kb_item("SMB/Office/Word/Install/Path");
if(!exePath){
  exePath = "Unable to fetch the install path";
}

if(exeVer =~ "^16\." && version_is_less(version:exeVer, test_version:"16.0.5083.1000"))
{
  report = report_fixed_ver(file_checked:exePath + "winword.exe",
                            file_version:exeVer, vulnerable_range:"16.0 - 16.0.5083.0999");
  security_message(data:report);
  exit(0);
}
exit(99);