Elastic Logstash 'CVE-2018-3817' Information Disclosure Vulnerability

# SPDX-FileCopyrightText: 2018 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

CPE = "cpe:/a:elastic:logstash";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.108358");
  script_version("2026-03-10T10:15:11+0000");
  script_cve_id("CVE-2018-3817");
  script_tag(name:"cvss_base", value:"4.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:S/C:P/I:N/A:N");
  script_tag(name:"last_modification", value:"2026-03-10 10:15:11 +0000 (Tue, 10 Mar 2026)");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2019-10-09 23:40:00 +0000 (Wed, 09 Oct 2019)");
  script_tag(name:"creation_date", value:"2018-03-01 13:43:42 +0100 (Thu, 01 Mar 2018)");
  script_name("Elastic Logstash 'CVE-2018-3817' Information Disclosure Vulnerability");
  script_copyright("Copyright (C) 2018 Greenbone AG");
  script_category(ACT_GATHER_INFO);
  script_family("General");
  script_dependencies("gb_elastic_logstash_consolidation.nasl");
  script_mandatory_keys("elastic/logstash/detected");

  script_tag(name:"summary", value:"Elastic Logstash is prone to an information disclosure
  vulnerability.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"impact", value:"When logging warnings regarding deprecated settings, Logstash
  could inadvertently log sensitive information.");

  script_tag(name:"affected", value:"Elastic Logstash versions prior to 5.6.6 and 6.x prior to
  6.1.2.");

  script_tag(name:"solution", value:"Update to version 5.6.6, 6.1.2 or later.

  Note: If you are unable to upgrade you should review your settings to ensure no deprecated
  settings are used in your environment.");

  script_xref(name:"URL", value:"https://www.elastic.co/community/security/");

  script_tag(name:"qod_type", value:"remote_banner");
  script_tag(name:"solution_type", value:"VendorFix");

  exit(0);
}

include("version_func.inc");
include("host_details.inc");

if (isnull(port = get_app_port(cpe: CPE)))
  exit(0);

if (!infos = get_app_version_and_location(cpe: CPE, port: port, exit_no_version: TRUE))
  exit(0);

version = infos["version"];
path = infos["location"];

if (version_is_less(version: version, test_version: "5.6.6")) {
  fix  = "5.6.6";
  VULN = TRUE;
}

if (version =~ "^6\.") {
  if (version_is_less(version: version, test_version: "6.1.2")) {
    fix  = "6.1.2";
    VULN = TRUE;
  }
}

if (VULN) {
  report = report_fixed_ver(installed_version: version, fixed_version: fix, install_path: path);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);