Elasticsearch 9.0.x < 9.4.7 / 9.5.x < 9.5.3 DoS (ESA-2026-192)

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

include('compat.inc');

if (description)
{
  script_id(363433);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/06");

  script_cve_id("CVE-2026-102411");

  script_name(english:"Elasticsearch 9.0.x < 9.4.7 / 9.5.x < 9.5.3 DoS (ESA-2026-192)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The version of Elasticsearch installed on the remote host is 9.0.x prior to 9.4.7, or 9.5.x prior to 9.5.3. It is,
therefore, affected by a vulnerability as referenced in the ESA-2026-192 advisory.

  - Allocation of Resources Without Limits or Throttling (CWE-770) in Elasticsearch can lead to Denial of
    Service via Excessive Allocation (CAPEC-130). Elasticsearch enforces a size limit on the user-supplied
    metadata field for each individual template resource, but does not limit the total memory used when
    multiple such resources are retrieved together. A user holding the *manage_index_templates* cluster
    privilege can register multiple resources each within the individual limit. Retrieving them together
    materializes all of their metadata values in memory at once, exhausting available heap and causing the
    affected node to fail with an out-of-memory error, resulting in a denial of service. (CVE-2026-102411)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://discuss.elastic.co/t/390865");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Elasticsearch version 9.4.7, or 9.5.3 or later as appropriate for your release branch.");
  script_set_attribute(attribute:"agent", value:"unix");
  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-2026-102411");

  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:"2026/10/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/06");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:elasticsearch:elasticsearch");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:elastic:elasticsearch");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

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

  script_dependencies("elasticsearch_detect.nbin", "elastic_elasticsearch_nix_installed.nbin");
  script_require_keys("installed_sw/Elasticsearch");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  "metadata": {
    "spec_version": "1.0"
  },
  "checks": [
    {
      "product": {
        "name": "Elasticsearch",
        "type": "app"
      },
      "check_algorithm": "default",
      "constraints": [
        {
          "min_version": "9.0.0",
          "fixed_version": "9.4.7"
        },
        {
          "min_version": "9.5.0",
          "fixed_version": "9.5.3"
        }
      ]
    }
  ]
};

var vdf_result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_WARNING);
vdf::handle_check_and_report_errors(vdf_result:vdf_result);