Elasticsearch 8.x < 8.19.15 / 9.0.x < 9.2.9 / 9.3.x < 9.3.4 DoS (ESA-2026-60)

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

include('compat.inc');

if (description)
{
  script_id(330340);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/29");

  script_cve_id("CVE-2026-63136");
  script_xref(name:"IAVA", value:"2026-A-0760");

  script_name(english:"Elasticsearch 8.x < 8.19.15 / 9.0.x < 9.2.9 / 9.3.x < 9.3.4 DoS (ESA-2026-60)");

  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 8.x prior to 8.19.15, or 9.0.x prior to 9.2.9, or 9.3.x prior to 9.3.4. It is, therefore,
affected by a vulnerability as referenced in the ESA-2026-60 advisory.

  - Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Excessive
    Allocation (CAPEC-130). A user with search privileges can submit a specially crafted search request that
    causes a data node to exhaust available heap memory, resulting in node unavailability and cluster
    degradation. An attacker could leverage this vulnerability to cause cluster downtime requiring manual
    intervention to restore service. (CVE-2026-63136)

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/elasticsearch-8-19-15-9-2-9-9-3-4-security-update-esa-2026-60/388559
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?50b026b3");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Elasticsearch version 8.19.15, 9.2.9, or 9.3.4 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-2026-63136");

  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:"2026/07/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/28");

  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:"stig_severity", value:"I");
  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'},
  'requires': [
    {'scope': 'target', 'match': {'os': 'linux'}}
  ],
  'checks': [
    {
      'product': {'name': 'Elasticsearch', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints' : [
         { 'min_version' : '8', 'fixed_version' : '8.19.15' },
         { 'min_version' : '9.0.0', 'fixed_version' : '9.2.9' },
         { 'min_version' : '9.3.0', 'fixed_version' : '9.3.4' }
      ]
    }
  ]
};

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