PowerDNS Security Advisory 2016-02: Crafted queries can cause abnormal CPU usage

# 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

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.112375");
  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 16:54:11 +0200 (Wed, 12 Sep 2018)");
  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:3.0/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:"2019-10-09 23:19:00 +0000 (Wed, 09 Oct 2019)");

  script_cve_id("CVE-2016-7068");

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

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

  script_name("PowerDNS Security Advisory 2016-02: Crafted queries can cause abnormal CPU usage");

  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_or_authoritative_server/detected");

  script_tag(name:"summary", value:"An issue has been found in PowerDNS allowing a remote,
  unauthenticated attacker to cause an abnormal CPU usage load on the PowerDNS server by sending
  crafted DNS queries, which might result in a partial denial of service if the system becomes overloaded.");

  script_tag(name:"insight", value:"This issue is based on the fact that the PowerDNS server parses
  all records present in a query regardless of whether they are needed or even legitimate. A specially
  crafted query containing a large number of records can be used to take advantage of that behaviour.
  This issue has been assigned CVE-2016-7068.");

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

  script_tag(name:"affected", value:"PowerDNS Authoritative Server up to and including 3.4.10 and 4.0.1 are affected.
  PowerDNS Recursor up to and including 3.7.3 and 4.0.3 are affected.");

  script_tag(name:"solution", value:"- Update to version 3.4.11 or 4.0.2 respectively.

  - Update PowerDNS Recursor to 3.7.4 or 4.0.4 respectively.");

  script_xref(name:"URL", value:"https://doc.powerdns.com/md/security/powerdns-advisory-2016-02/");

  exit(0);
}

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

cpe_list = make_list( "cpe:/a:powerdns:authoritative_server", "cpe:/a:powerdns:recursor" );

if( ! list_infos = get_app_port_from_list( cpe_list:cpe_list ) )
  exit( 0 );

cpe = list_infos["cpe"];
port = list_infos["port"];

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

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

if( cpe == "cpe:/a:powerdns:authoritative_server" ) {
  if( version_is_less( version:version, test_version:"3.4.11" ) ) {
    report = report_fixed_ver( installed_version:version, fixed_version:"3.4.11" );
    security_message( data:report, port:port, proto:proto );
    exit( 0 );
  }
  if( version_is_equal( version:version, test_version:"4.0.1" ) ) {
    report = report_fixed_ver( installed_version:version, fixed_version:"4.0.2" );
    security_message( data:report, port:port, proto:proto );
    exit( 0 );
  }
} else if( cpe == "cpe:/a:powerdns:recursor" ) {
  if( version_is_less( version:version, test_version:"3.7.3" ) ) {
    report = report_fixed_ver( installed_version:version, fixed_version:"3.7.4" );
    security_message( data:report, port:port, proto:proto );
    exit( 0 );
  }
  if( version_is_equal( version:version, test_version:"4.0.3" ) ) {
    report = report_fixed_ver( installed_version:version, fixed_version:"4.0.4" );
    security_message( data:report, port:port, proto:proto );
    exit( 0 );
  }
}

exit( 99 );