PowerDNS Security Advisory 2016-04: Insufficient validation of TSIG signatures

# 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("1.3.6.1.4.1.25623.1.0.112374");
  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:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:P/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N");
  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-2016-7073", "CVE-2016-7074");

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

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

  script_name("PowerDNS Security Advisory 2016-04: Insufficient validation of TSIG signatures");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2018 Greenbone AG");
  script_family("General");
  script_dependencies("gb_powerdns_dns_detect.nasl");
  script_mandatory_keys("powerdns/recursor_or_authoritative_server/detected");

  script_tag(name:"summary", value:"Two issues have been found in PowerDNS Authoritative Server allowing
  an attacker in position of man-in-the-middle to alter the content of an AXFR because of insufficient validation
  of TSIG signatures.");

  script_tag(name:"insight", value:"The first issue is a missing check of the TSIG time and fudge values in AXFRRetriever,
  leading to a possible replay attack. This issue has been assigned CVE-2016-7073.

  The second issue is a missing check that the TSIG record is the last one, leading to the possibility of parsing records that are not covered by the TSIG signature.
  This issue has been assigned CVE-2016-7074.");

  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 version
  3.4.10 and 4.0.1.

  - PowerDNS Recursor from 4.0.0 up to and including 4.0.3 versions.");

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

  - Update PowerDNS Recursor 4.x.x to version 4.0.4.");

  script_xref(name:"URL", value:"https://doc.powerdns.com/md/security/powerdns-advisory-2016-04/");

  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_in_range( version:version, test_version:"4.0.0", test_version2:"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 );