PowerDNS Recursor DoS Vulnerability (2025-07)

# SPDX-FileCopyrightText: 2025 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:recursor";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.155945");
  script_version("2025-12-10T05:45:47+0000");
  script_tag(name:"last_modification", value:"2025-12-10 05:45:47 +0000 (Wed, 10 Dec 2025)");
  script_tag(name:"creation_date", value:"2025-12-09 03:44:50 +0000 (Tue, 09 Dec 2025)");
  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_cve_id("CVE-2025-59029");

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

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

  script_name("PowerDNS Recursor DoS Vulnerability (2025-07)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2025 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("gb_powerdns_dns_detect.nasl");
  script_mandatory_keys("powerdns/recursor/detected");

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

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

  script_tag(name:"insight", value:"An internal logic flaw in the cache management can lead to a
  denial of service in the Recursor. This problem can be triggered by specific cache contents and a
  query with qtype ANY.");

  script_tag(name:"affected", value:"PowerDNS Recursor version 5.3.0 and 5.3.1.");

  script_tag(name:"solution", value:"Update to version 5.3.2 or later.");

  script_xref(name:"URL", value:"https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2025-07.html");

  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_in_range_exclusive(version: version, test_version_lo: "5.3.0", test_version_up: "5.3.2")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "5.3.2");
  security_message(port: port, proto: proto, data: report);
  exit(0);
}

exit(99);