Check MK < 2.0.0p34, 2.1.x < 2.1.0p24 Certification Validation Vulnerability

# SPDX-FileCopyrightText: 2023 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

CPE = "cpe:/a:checkmk:checkmk";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.149405");
  script_version("2026-06-05T07:00:05+0000");
  script_tag(name:"last_modification", value:"2026-06-05 07:00:05 +0000 (Fri, 05 Jun 2026)");
  script_tag(name:"creation_date", value:"2023-03-06 04:26:21 +0000 (Mon, 06 Mar 2023)");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:C/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2022-12-13 16:13:00 +0000 (Tue, 13 Dec 2022)");

  script_cve_id("CVE-2022-23491");

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

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

  script_name("Check MK < 2.0.0p34, 2.1.x < 2.1.0p24 Certification Validation Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2023 Greenbone AG");
  script_family("General");
  script_dependencies("gb_checkmk_server_http_detect.nasl");
  script_mandatory_keys("checkmk/detected");

  script_tag(name:"summary", value:"Check MK is prone to a certification validation vulnerability.");

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

  script_tag(name:"insight", value:"The compiled version of the agent-updater uses its own
  collection of trusted Certificate Authorities. This collection comes from the Python package
  certifi and is based on the collection of Mozilla Firefox. The used Python package and therefore
  the collection was outdated and is subject to CVE-2022-23491. This collection included a CA
  certificate of TrustCor which is not considered trustworthy anymore.");

  script_tag(name:"impact", value:"If an attacker is able to create certificates for arbitrary
  domains signed by this CA, machine-in-the-middle attacks could be possible.");

  script_tag(name:"affected", value:"Check MK prior to version 2.0.0p34 and 2.1.x prior to
  2.1.0p24.");

  script_tag(name:"solution", value:"Update to version 2.0.0p34, 2.1.0p24 or later.");

  script_xref(name:"URL", value:"https://checkmk.com/werk/15068");

  exit(0);
}

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

if (!port = get_app_port(cpe: CPE))
  exit(0);

if (!infos = get_app_version_and_location(cpe: CPE, port: port, exit_no_version: TRUE))
  exit(0);

version = infos["version"];
location = infos["location"];

if (version_is_less(version: version, test_version:  "2.0.0p34")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "2.0.0p34", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "2.1.0", test_version_up: "2.1.0p24")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "2.1.0p24", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);