PowerDNS Security Advisory 2014-02: PowerDNS Recursor 3.6.1 and earlier can be made to provide bad service

# SPDX-FileCopyrightText: 2018 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("1.3.6.1.4.1.25623.1.0.112377");
  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:"2018-09-12 17:43:21 +0200 (Wed, 12 Sep 2018)");
  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-2014-8601");

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

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

  script_name("PowerDNS Security Advisory 2014-02: PowerDNS Recursor 3.6.1 and earlier can be made to provide bad service");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2018 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 before 3.6.2 does not limit delegation chaining,
  which allows remote attackers to cause a denial of service ("performance degradations") via a large
  or infinite number of referrals, as demonstrated by resolving domains hosted by ezdns.it.');

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

  script_tag(name:"affected", value:"PowerDNS Recursor before version 3.6.2.");

  script_tag(name:"solution", value:"Update to version 3.6.2.");

  script_xref(name:"URL", value:"https://doc.powerdns.com/md/security/powerdns-advisory-2014-02/");

  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_is_less( version:version, test_version:"3.6.2" ) ) {
  report = report_fixed_ver( installed_version:version, fixed_version:"3.6.2" );
  security_message( data:report, port:port, proto:proto );
  exit( 0 );
}

exit( 99 );