ISC BIND DoS Vulnerability (CVE-2023-2828) - Linux

# SPDX-FileCopyrightText: 2023 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("1.3.6.1.4.1.25623.1.0.149838");
  script_version("2023-10-13T05:06:10+0000");
  script_tag(name:"last_modification", value:"2023-10-13 05:06:10 +0000 (Fri, 13 Oct 2023)");
  script_tag(name:"creation_date", value:"2023-06-22 04:45:50 +0000 (Thu, 22 Jun 2023)");
  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:"2023-06-21 21:15:00 +0000 (Wed, 21 Jun 2023)");

  script_cve_id("CVE-2023-2828");

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

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

  script_name("ISC BIND DoS Vulnerability (CVE-2023-2828) - Linux");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2023 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_unixoide");

  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:"Every named instance configured to run as a recursive resolver
  maintains a cache database holding the responses to the queries it has recently sent to
  authoritative servers. The size limit for that cache database can be configured using the
  max-cache-size statement in the configuration file, it defaults to 90% of the total amount of
  memory available on the host. When the size of the cache reaches 7/8 of the configured limit, a
  cache-cleaning algorithm starts to remove expired and/or least-recently used RRsets from the
  cache, to keep memory use below the configured limit.

  It has been discovered that the effectiveness of the cache-cleaning algorithm used in named can
  be severely diminished by querying the resolver for specific RRsets in a certain order,
  effectively 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 factors (e.g. query load, query patterns), but
  since the default value of the max-cache-size statement is 90%, 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 versions 9.11.0 through 9.16.41, 9.18.0 through
  9.18.15, 9.19.0 through 9.19.13, 9.11.3-S1 through 9.16.41-S1 and 9.18.11-S1 through
  9.18.15-S1.");

  script_tag(name:"solution", value:"Update to version 9.16.42, 9.18.16, 9.19.14, 9.16.42-S1,
  9.18.16-S1 or later.");

  script_xref(name:"URL", value:"https://kb.isc.org/docs/cve-2023-2828");

  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: "9.11.3s1", test_version2: "9.16.41s1")) {
    report = report_fixed_ver(installed_version: version, fixed_version: "9.16.42-S1", install_path: location);
    security_message(port: port, data: report, proto: proto);
    exit(0);
  }

  if (version_in_range(version: version, test_version: "9.18.11s1", test_version2: "9.18.15s1")) {
    report = report_fixed_ver(installed_version: version, fixed_version: "9.18.16-S1", install_path: location);
    security_message(port: port, data: report, proto: proto);
    exit(0);
  }
} else {
  if (version_in_range(version: version, test_version: "9.11.0", test_version2: "9.16.41")) {
    report = report_fixed_ver(installed_version: version, fixed_version: "9.16.42", install_path: location);
    security_message(port: port, data: report, proto: proto);
    exit(0);
  }

  if (version_in_range(version: version, test_version: "9.18.0", test_version2: "9.18.15")) {
    report = report_fixed_ver(installed_version: version, fixed_version: "9.18.16", install_path: location);
    security_message(port: port, data: report, proto: proto);
    exit(0);
  }

  if (version_in_range(version: version, test_version: "9.19.0", test_version2: "9.19.13")) {
    report = report_fixed_ver(installed_version: version, fixed_version: "9.19.14", install_path: location);
    security_message(port: port, data: report, proto: proto);
    exit(0);
  }
}

exit(99);