ISC BIND update-policy Enforcement Vulnerability (CVE-2020-8624) - Linux

# Copyright (C) 2020 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("1.3.6.1.4.1.25623.1.0.144439");
  script_version("2021-07-07T11:00:41+0000");
  script_tag(name:"last_modification", value:"2021-07-07 11:00:41 +0000 (Wed, 07 Jul 2021)");
  script_tag(name:"creation_date", value:"2020-08-21 03:19:37 +0000 (Fri, 21 Aug 2020)");
  script_tag(name:"cvss_base", value:"4.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:S/C:N/I:P/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2020-10-20 12:15:00 +0000 (Tue, 20 Oct 2020)");

  script_cve_id("CVE-2020-8624");

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

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

  script_name("ISC BIND update-policy Enforcement Vulnerability (CVE-2020-8624) - Linux");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2020 Greenbone Networks GmbH");
  script_family("General");
  script_dependencies("gb_isc_bind_consolidation.nasl", "os_detection.nasl");
  script_mandatory_keys("isc/bind/detected", "Host/runs_unixoide");

  script_tag(name:"summary", value:"ISC BIND is prone to a vulnerability where update-policy rules of type
  'subdomain' are enforced incorrectly.");

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

  script_tag(name:"insight", value:"Change 4885 inadvertently caused 'update-policy' rules of type 'subdomain' to
  be treated as if they were of type 'zonesub', allowing updates to all parts of the zone along with the intended
  subdomain.");

  script_tag(name:"impact", value:"An attacker who has been granted privileges to change a specific subset of the
  zone's content could abuse these unintended additional privileges to update other contents of the zone.");

  script_tag(name:"affected", value:"BIND 9.9.12 - 9.9.13, 9.10.7 - 9.10.8, 9.11.3 - 9.11.21, 9.12.1 - 9.16.5,
  9.17.0 - 9.17.3, also affects 9.9.12-S1 - 9.9.13-S1 and 9.11.3-S1 - 9.11.21-S1.");

  script_tag(name:"solution", value:"Update to version 9.11.22, 9.16.6, 9.17.4, 9.11.22-S1 or later.");

  script_xref(name:"URL", value:"https://kb.isc.org/docs/cve-2020-8624");

  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 =~ "^9\.(9|11)\.[0-9]+s[0-9]") {
  if (version_in_range(version: version, test_version: "9.9.12s1", test_version2: "9.9.13s1") ||
      version_in_range(version: version, test_version: "9.11.3s1", test_version2: "9.11.21s1")) {
    report = report_fixed_ver(installed_version: version, fixed_version: "9.11.22-S1", install_path: location);
    security_message(port: port, data: report, proto: proto);
    exit(0);
  }
} else {
  if (version_in_range(version: version, test_version: "9.9.12", test_version2: "9.9.13") ||
      version_in_range(version: version, test_version: "9.10.7", test_version2: "9.10.8") ||
      version_in_range(version: version, test_version: "9.11.3", test_version2: "9.11.21")) {
    report = report_fixed_ver(installed_version: version, fixed_version: "9.11.22", install_path: location);
    security_message(port: port, data: report, proto: proto);
    exit(0);
  }

  if (version_in_range(version: version, test_version: "9.12.1", test_version2: "9.16.5")) {
    report = report_fixed_ver(installed_version: version, fixed_version: "9.16.6", install_path: location);
    security_message(port: port, data: report, proto: proto);
    exit(0);
  }

  if (version_in_range(version: version, test_version: "9.17.0", test_version2: "9.17.3")) {
    report = report_fixed_ver(installed_version: version, fixed_version: "9.17.4", install_path: location);
    security_message(port: port, data: report, proto: proto);
    exit(0);
  }
}

exit(99);