Dnsmasq <= 2.89 UDP Fragmentation DoS 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:thekelleys:dnsmasq";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.104641");
  script_version("2024-03-13T05:05:57+0000");
  script_tag(name:"last_modification", value:"2024-03-13 05:05:57 +0000 (Wed, 13 Mar 2024)");
  script_tag(name:"creation_date", value:"2023-03-16 15:18:09 +0000 (Thu, 16 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: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:"2023-03-21 19:24:00 +0000 (Tue, 21 Mar 2023)");

  script_cve_id("CVE-2023-28450");

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

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

  script_name("Dnsmasq <= 2.89 UDP Fragmentation DoS Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2023 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("gb_dnsmasq_consolidation.nasl");
  script_mandatory_keys("thekelleys/dnsmasq/detected");

  script_tag(name:"summary", value:"Dnsmasq is prone to a denial of service (DoS) vulnerability via
  an UDP Fragmentation attack.");

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

  script_tag(name:"insight", value:"The default maximum EDNS.0 UDP packet size was set to 4096 but
  should be 1232 because of DNS Flag Day 2020.");

  script_tag(name:"affected", value:"Dnsmasq version 2.89 and prior.");

  script_tag(name:"solution", value:"Update to version 2.90 or later.");

  script_xref(name:"URL", value:"https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=eb92fb32b746f2104b0f370b5b295bb8dd4bd5e5");
  script_xref(name:"URL", value:"https://thekelleys.org.uk/dnsmasq/CHANGELOG");
  script_xref(name:"URL", value:"https://www.dnsflagday.net/2020/");

  exit(0);
}

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

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

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

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

if (version_is_less_equal(version: version, test_version: "2.89")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "2.90", install_path: location);
  security_message(port: port, proto: proto, data: report);
  exit(0);
}

exit(99);