Wazuh Server 3.9.0 < 4.14.5 DoS (CVE-2026-44253)

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

include('compat.inc');

if (description)
{
  script_id(339368);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/26");

  script_cve_id("CVE-2026-44253");

  script_name(english:"Wazuh Server 3.9.0 < 4.14.5 DoS (CVE-2026-44253)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host contains a threat prevention, detection, and response platform that is affected by a denial of service vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Wazuh Server on the remote host is at least 3.9.0 and prior to 4.14.5. It is, therefore, affected by a
denial of service vulnerability:

  - The cluster protocol allows an authenticated cluster node to exhaust memory on the master. The receive_str()
    method accepts an attacker-controlled total for InBuffer without a maximum, and the divided-message path retains
    fragments without limits. Exploitation can disrupt agent connectivity and alert processing. (CVE-2026-44253)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b4879592");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Wazuh Server version 4.14.5 or later.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:M/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:H/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-2026-44253");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(770, 789);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/25");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:wazuh:wazuh");
  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("wazuh_server_nix_installed.nbin");
  script_require_keys("installed_sw/Wazuh-Manager");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'Wazuh-Manager', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'min_version': '3.9.0', 'fixed_version': '4.14.5'}
      ]
    }
  ]
};

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