Check MK Agent < 1.6.0p17 Privilege Escalation Vulnerability

# Copyright (C) 2021 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.

CPE = "cpe:/a:check_mk_project:check_mk";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.146389");
  script_version("2021-08-17T09:01:01+0000");
  script_tag(name:"last_modification", value:"2021-08-17 09:01:01 +0000 (Tue, 17 Aug 2021)");
  script_tag(name:"creation_date", value:"2021-07-28 09:16:16 +0000 (Wed, 28 Jul 2021)");
  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:"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:"2021-02-25 13:49:00 +0000 (Thu, 25 Feb 2021)");

  script_cve_id("CVE-2020-24908");

  script_tag(name:"qod_type", value:"remote_banner");

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

  script_name("Check MK Agent < 1.6.0p17 Privilege Escalation Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
  script_family("Privilege escalation");
  script_dependencies("gb_check_mk_agent_detect.nasl", "os_detection.nasl");
  script_mandatory_keys("check_mk/agent/installed", "Host/runs_windows");

  script_tag(name:"summary", value:"Check MK Agent is prone to a privilege escalation vulnerability
  on Windows.");

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

  script_tag(name:"insight", value:"Check MK Agent allows local users to obtain SYSTEM privileges
  via a Trojan horse shell script in the %PROGRAMDATA%\checkmk\agent\local directory.");

  script_tag(name:"affected", value:"Check MK Agent version 1.6.0p16 and prior on Windows.");

  script_tag(name:"solution", value:"Update to version 1.6.0p17 or later.");

  script_xref(name:"URL", value:"https://checkmk.com/werk/11460");
  script_xref(name:"URL", value:"https://www.compass-security.com/fileadmin/Research/Advisories/2020-05_CSNC-2020-005_Checkmk_Local_Privilege_Escalation.txt");

  exit(0);
}

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

if (!port = get_app_port(cpe: CPE, service: "check_mk_agent"))
  exit(0);

if (!version = get_app_version(cpe: CPE, port: port))
  exit(0);

if (version_is_less(version: version, test_version: "1.6.0p17")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "1.6.0p17");
  security_message(port: port, data: report);
  exit(0);
}

exit(99);