Kibana 8.x < 8.19.16 DoS (ESA-2026-39)

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

include('compat.inc');

if (description)
{
  script_id(318725);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/08");

  script_cve_id("CVE-2026-49094");
  script_xref(name:"IAVB", value:"2026-B-0141");
  script_xref(name:"IAVB", value:"2026-B-0142");

  script_name(english:"Kibana 8.x < 8.19.16 DoS (ESA-2026-39)");

  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 8.x prior to 8.19.16. It is, therefore, affected by a
vulnerability as referenced in the ESA-2026-39 advisory.

  - Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive
    Allocation (CAPEC-130). An authenticated user with viewer-level access can submit a request containing an
    oversized input value to an analytics collections management endpoint. Kibana will consume excessive CPU
    and memory resources while processing the request. This results in Kibana becoming unavailable to all
    users until the service is manually recovered. (CVE-2026-49094)

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-8-19-16-security-update-esa-2026-39/386561/1
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0b3e0800");
  script_set_attribute(attribute:"solution", value:
"Update to Kibana version 8.19.16 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC: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_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-49094");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/05/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/05/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/04");

  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' : '8.0.0', 'fixed_version' : '8.19.16' }
];

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