Unbound DNS Resolver < 1.4.10 Remote DoS Vulnerability

# SPDX-FileCopyrightText: 2011 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:unbound:unbound";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.103170");
  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:"2011-06-03 14:27:02 +0200 (Fri, 03 Jun 2011)");
  script_tag(name:"cvss_base", value:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:N/A:P");
  script_cve_id("CVE-2011-1922");
  script_name("Unbound DNS Resolver < 1.4.10 Remote DoS Vulnerability");
  script_category(ACT_GATHER_INFO);
  script_family("Denial of Service");
  script_copyright("Copyright (C) 2011 Greenbone AG");
  script_dependencies("gb_unbound_dns_detect.nasl");
  script_mandatory_keys("unbound/detected");

  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/47986");
  script_xref(name:"URL", value:"http://unbound.nlnetlabs.nl/downloads/CVE-2011-1922.txt");
  script_xref(name:"URL", value:"http://www.kb.cert.org/vuls/id/531342");

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

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

  script_tag(name:"impact", value:"Successfully exploiting this issue allows remote attackers to
  crash the server, denying further service to legitimate users.");

  script_tag(name:"affected", value:"Unbound versions prior to 1.4.10.");

  script_tag(name:"solution", value:"Updates are available. Please see the references for more
  information.");

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

  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:"1.4.10" ) ) {
  report = report_fixed_ver( installed_version:version, fixed_version:"1.4.10" );
  security_message( data:report, port:port, proto:proto );
  exit( 0 );
}

exit( 99 );