Elastic Logstash 'CVE-2015-5378' Man in the Middle Security Bypass 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("1.3.6.1.4.1.25623.1.0.107278");
  script_version("2026-03-10T10:15:11+0000");
  script_cve_id("CVE-2015-5378");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/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:N/UI:N/S:U/C:H/I:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2019-06-17 15:48:00 +0000 (Mon, 17 Jun 2019)");
  script_tag(name:"creation_date", value:"2018-01-31 14:18:58 +0100 (Wed, 31 Jan 2018)");
  script_name("Elastic Logstash 'CVE-2015-5378' Man in the Middle Security Bypass Vulnerability");

  script_tag(name:"summary", value:"Elastic Logstash is prone to a security bypass vulnerability.");

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

  script_tag(name:"insight", value:"The flaw is due to the usage of Lumberjack input (in combination
  with Logstash Forwarder agent).");

  script_tag(name:"impact", value:"Successfully exploiting these issues may allow attackers to
  perform unauthorized actions by conducting a man-in-the-middle attack. This may lead to other
  attacks.");

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

  script_tag(name:"affected", value:"Elastic Logstash versions prior to 1.4.4 and 1.5.x prior to
  1.5.3.");

  script_tag(name:"solution", value:"Update to version 1.4.4, 1.5.3 or later.

  Note: Users that do not want to upgrade can address the vulnerability by disabling the Lumberjack
  input.");

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

  script_xref(name:"URL", value:"https://www.elastic.co/community/security/");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/76015");

  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");

  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 =~ "^1\.4\.") {
  if (version_is_less(version: version, test_version: "1.4.3")) {
    report = report_fixed_ver(installed_version: version, fixed_version: "1.4.3", install_path: path);
    security_message(port: port, data: report);
    exit(0);
  }
}

if (version =~ "^1\.5\.") {
  if (version_is_less(version: version, test_version: "1.5.3")) {
    report = report_fixed_ver(installed_version: version, fixed_version: "1.5.3", install_path: path);
    security_message(port: port, data: report);
    exit(0);
  }
}

exit(99);