ISC BIND DoS Vulnerability (CVE-2011-1907)

# Copyright (C) 2021 Greenbone Networks GmbH
# 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-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

CPE = "cpe:/a:isc:bind";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.117778");
  script_version("2021-11-16T14:48:45+0000");
  script_tag(name:"last_modification", value:"2021-11-16 14:48:45 +0000 (Tue, 16 Nov 2021)");
  script_tag(name:"creation_date", value:"2021-11-16 14:40:51 +0000 (Tue, 16 Nov 2021)");
  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-2011-1907");

  script_tag(name:"qod_type", value:"remote_banner_unreliable"); # nb: See affected tag

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

  script_name("ISC BIND DoS Vulnerability (CVE-2011-1907)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
  script_family("Denial of Service");
  script_dependencies("gb_isc_bind_consolidation.nasl");
  script_mandatory_keys("isc/bind/detected");

  script_tag(name:"summary", value:"ISC BIND 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:"BIND 9.8.0 introduced Response Policy Zones (RPZ), a mechanism
  for modifying DNS responses returned by a recursive server according to a set of rules which are
  either defined locally or imported from a reputation provider. In typical configurations, RPZ is
  used to force NXDOMAIN responses for untrusted names. It can also be used for RRset replacement,
  i.e., returning a positive answer defined by the response policy.");

  script_tag(name:"impact", value:"When RPZ is being used, a query of type RRSIG for a name
  configured for RRset replacement will trigger an assertion failure and cause the name server
  process to exit.");

  script_tag(name:"affected", value:"ISC BIND version 9.8.0 only.

  Note: Only BIND installations which are using the RPZ feature configured for RRset replacement are
  affected.");

  script_tag(name:"solution", value:"Update to version 9.8.0-P1 or later.

  As a workaround use RPZ only for forcing NXDOMAIN responses and not for RRset replacement.");

  script_xref(name:"URL", value:"https://kb.isc.org/docs/aa-00460");

  exit(0);
}

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

if (isnull(port = get_app_port(cpe: CPE)))
  exit(0);

if (!infos = get_app_full(cpe: CPE, port: port, exit_no_version: TRUE))
  exit(0);

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

if (version_is_equal(version: version, test_version: "9.8.0")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "9.8.0-P1", install_path: location);
  security_message(port: port, data: report, proto: proto);
  exit(0);
}

exit(99);