PowerDNS Authoritative Server DoS Vulnerability (2021-01)

# SPDX-FileCopyrightText: 2021 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:powerdns:authoritative_server";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.146382");
  script_version("2025-10-31T05:40:56+0000");
  script_tag(name:"last_modification", value:"2025-10-31 05:40:56 +0000 (Fri, 31 Oct 2025)");
  script_tag(name:"creation_date", value:"2021-07-27 02:31:35 +0000 (Tue, 27 Jul 2021)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
  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:"2021-08-07 02:28:00 +0000 (Sat, 07 Aug 2021)");

  script_cve_id("CVE-2021-36754");

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

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

  script_name("PowerDNS Authoritative Server DoS Vulnerability (2021-01)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("gb_powerdns_dns_detect.nasl");
  script_mandatory_keys("powerdns/authoritative_server/detected");

  script_tag(name:"summary", value:"PowerDNS Authoritative Server is prone to a denial of service
  (DoS) vulnerability.");

  script_tag(name:"insight", value:"PowerDNS Authoritative Server will crash with an uncaught out
  of bounds exception if it receives a query with QTYPE 65535.");

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

  script_tag(name:"affected", value:"PowerDNS Authoritative Server version 4.5.0 only.");

  script_tag(name:"solution", value:"Update to version 4.5.1 or later.");

  script_xref(name:"URL", value:"https://blog.powerdns.com/2021/07/26/security-advisory-2021-01-for-powerdns-authoritative-server-4-5-0/");

  exit(0);
}

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

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

if (!infos = get_app_version_and_proto(cpe: CPE, port: port))
  exit(0);

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

if (version =~ "^4\.5\.0") {
  report = report_fixed_ver(installed_version: version, fixed_version: "4.5.1");
  security_message(data: report, port: port, proto: proto);
  exit(0);
}

exit(99);