Kibana 9.3.x < 9.3.8 / 9.4.x < 9.4.4 Denial of Service (ESA-2026-91)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(338739);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/21");

  script_cve_id("CVE-2026-72674");
  script_xref(name:"IAVB", value:"2026-B-0232");

  script_name(english:"Kibana 9.3.x < 9.3.8 / 9.4.x < 9.4.4 Denial of Service (ESA-2026-91)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by a denial of service vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Kibana installed on the remote host is 9.3.x prior to 9.3.8, or 9.4.x prior to 9.4.4. It is,
therefore, affected by a vulnerability as referenced in the ESA-2026-91 advisory.

  - Allocation of Resources Without Limits or Throttling (CWE-770) in Kibana can lead to a denial of service via
    Excessive Allocation (CAPEC-130). A user-supplied list of document fields accepted by the Kibana Playground
    for RAG feature was neither bounded in length nor de-duplicated before it was used to assemble the response
    for each matching document. A single crafted request could therefore make Kibana build a response far larger
    than the data it was derived from, and the resulting processing and memory pressure exhausts the resources
    of the Kibana instance. (CVE-2026-72674)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported
version number.");
  # https://discuss.elastic.co/t/kibana-9-3-8-9-4-4-security-update-esa-2026-91/389533
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?76a1b27e");
  script_set_attribute(attribute:"solution", value:
"Update to Kibana version 9.3.8, 9.4.4 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-72674");

  script_cwe_id(770);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/21");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:elasticsearch:kibana");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("kibana_web_detect.nbin");
  script_require_keys("installed_sw/Kibana");
  script_require_ports("Services/www", 5601);

  exit(0);
}

include('http.inc');
include('vcf.inc');

var app = 'Kibana';

get_install_count(app_name:app, exit_if_zero:TRUE);

var port = get_http_port(default:5601);

var app_info = vcf::get_app_info(app:app, port:port, webapp:TRUE);

var constraints = [
  { 'min_version' : '9.3.0', 'fixed_version' : '9.3.8' },
  { 'min_version' : '9.4.0', 'fixed_version' : '9.4.4' }
];

vcf::check_version_and_report(
  app_info:app_info,
  constraints:constraints,
  severity:SECURITY_WARNING
);