Pi-hole FTLDNS < 5.25 Multiple DoS Vulnerabilities (KeyTrap)

# SPDX-FileCopyrightText: 2024 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:pi-hole:ftldns";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.151753");
  script_version("2026-04-16T06:18:46+0000");
  script_tag(name:"last_modification", value:"2026-04-16 06:18:46 +0000 (Thu, 16 Apr 2026)");
  script_tag(name:"creation_date", value:"2024-02-19 03:27:07 +0000 (Mon, 19 Feb 2024)");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2024-02-20 16:55:30 +0000 (Tue, 20 Feb 2024)");

  script_cve_id("CVE-2023-50387", "CVE-2023-50868");

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

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

  script_name("Pi-hole FTLDNS < 5.25 Multiple DoS Vulnerabilities (KeyTrap)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2024 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("gb_pi-hole_consolidation.nasl");
  script_mandatory_keys("pi-hole/detected");

  script_tag(name:"summary", value:"Pi-hole FTLDNS is prone to multiple denial of service (DoS)
  vulnerabilities.");

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

  script_tag(name:"insight", value:"The following vulnerabilities exist:

  - CVE-2023-50387: KeyTrap - Extreme CPU consumption in DNSSEC validator

  - CVE-2023-50868: Preparing an NSEC3 closest encloser proof can exhaust CPU resources");

  script_tag(name:"affected", value:"Pi-hole FTLDNS version 5.24 and prior.");

  script_tag(name:"solution", value:"Update to version 5.25 or later.");

  script_xref(name:"URL", value:"https://pi-hole.net/blog/2024/02/13/fixing-two-new-dnssec-vulnerabilities/");
  script_xref(name:"URL", value:"https://github.com/pi-hole/FTL/releases/tag/v5.25");
  script_xref(name:"URL", value:"https://www.athene-center.de/en/keytrap");

  exit(0);
}

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

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

if (version_is_less(version: version, test_version: "5.25")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "5.25");
  security_message(port: 0, data: report);
  exit(0);
}

exit(99);