ISC BIND DoS Vulnerability (CVE-2023-6516) - Windows

# SPDX-FileCopyrightText: 2024 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:isc:bind";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.151718");
  script_version("2024-02-15T05:05:40+0000");
  script_tag(name:"last_modification", value:"2024-02-15 05:05:40 +0000 (Thu, 15 Feb 2024)");
  script_tag(name:"creation_date", value:"2024-02-14 04:11:08 +0000 (Wed, 14 Feb 2024)");
  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:3.1/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:"2024-02-13 14:15:46 +0000 (Tue, 13 Feb 2024)");

  script_cve_id("CVE-2023-6516");

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

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

  script_name("ISC BIND DoS Vulnerability (CVE-2023-6516) - Windows");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2024 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("gb_isc_bind_consolidation.nasl", "os_detection.nasl");
  script_mandatory_keys("isc/bind/detected", "Host/runs_windows");

  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:"To keep its cache database efficient, named running as a
  recursive resolver occasionally attempts to clean up the database. It uses several methods,
  including some that are asynchronous: a small chunk of memory pointing to the cache element that
  can be cleaned up is first allocated and then queued for later processing. It was discovered that
  if the resolver is continuously processing query patterns triggering this type of cache-database
  maintenance, named may not be able to handle the cleanup events in a timely manner. This in
  turn enables the list of queued cleanup events to grow infinitely large over time, allowing the
  configured max-cache-size limit to be significantly exceeded.");

  script_tag(name:"impact", value:"By exploiting this flaw, an attacker can cause the amount of
  memory used by a named resolver to go well beyond the configured max-cache-size limit. The
  effectiveness of the attack depends on a number of environmental factors, but in the worst case
  the attacker can exhaust all available memory on the host running named, leading to a
  denial-of-service condition.");

  script_tag(name:"affected", value:"ISC BIND version 9.16.0 through 9.16.45 and 9.16.8-S1 through
  9.16.45-S1.");

  script_tag(name:"solution", value:"Update to version 9.16.48, 9.16.48-S1 or later.");

  script_xref(name:"URL", value:"https://kb.isc.org/docs/cve-2023-6516");

  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\.[0-9]+\.[0-9]+s[0-9]") {
  if (version_in_range(version: version, test_version: "9.16.8s1", test_version2: "9.16.45s1")) {
    report = report_fixed_ver(installed_version: version, fixed_version: "9.16.48-S1", install_path: location);
    security_message(port: port, data: report, proto: proto);
    exit(0);
  }
} else {
  if (version_in_range(version: version, test_version: "9.16.0", test_version2: "9.16.45")) {
    report = report_fixed_ver(installed_version: version, fixed_version: "9.16.48", install_path: location);
    security_message(port: port, data: report, proto: proto);
    exit(0);
  }
}

exit(99);