Elastic Elasticsearch Multiple Log4j Vulnerabilities (ESA-2021-31, Log4Shell) - Version Check

# SPDX-FileCopyrightText: 2021 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:elasticsearch";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.117838");
  script_version("2026-03-10T10:15:11+0000");
  script_tag(name:"last_modification", value:"2026-03-10 10:15:11 +0000 (Tue, 10 Mar 2026)");
  script_tag(name:"creation_date", value:"2021-12-15 08:34:52 +0000 (Wed, 15 Dec 2021)");
  script_tag(name:"cvss_base", value:"9.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-12-14 01:15:00 +0000 (Tue, 14 Dec 2021)");

  script_cve_id("CVE-2021-44228", "CVE-2021-45046");

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

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

  script_name("Elastic Elasticsearch Multiple Log4j Vulnerabilities (ESA-2021-31, Log4Shell) - Version Check");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_elastic_elasticsearch_consolidation.nasl");
  script_mandatory_keys("elastic/elasticsearch/detected");

  script_tag(name:"summary", value:"Elastic Elasticsearch is prone to multiple vulnerabilities in
  the Apache Log4j library.");

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

  script_tag(name:"insight", value:"The following vulnerabilities exist:

  - CVE-2021-44228: Apache Log4j2 JNDI features used in configuration, log messages, and parameters
  do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who
  can control log messages or log message parameters can execute arbitrary code loaded from LDAP
  servers when message lookup substitution is enabled. This vulnerability is dubbed 'Log4Shell'.

  - CVE-2021-45046: Denial of Service (DoS) and a possible remote code execution (RCE) in certain
  non-default configurations.");

  script_tag(name:"impact", value:"Please note the following vendor statement on the impact:

  Elasticsearch 6 and 7 are not susceptible to remote code execution with this vulnerability due to
  our use of the Java Security Manager. Elasticsearch running on JDK8 or below is susceptible to an
  information leak via DNS.

  Elasticsearch 5 is susceptible to both remote code execution and an information leak via DNS.

  To avoid unknown risks it is still recommended to apply the update provided by the vendor.");

  script_tag(name:"affected", value:"Elastic Elasticsearch version 5.x through 7.x.");

  script_tag(name:"solution", value:"Update to version 6.8.21, 7.16.1 or later.");

  script_xref(name:"URL", value:"https://discuss.elastic.co/t/apache-log4j2-remote-code-execution-rce-vulnerability-cve-2021-44228-esa-2021-31/291476");
  script_xref(name:"URL", value:"https://discuss.elastic.co/t/elasticsearch-5-0-0-5-6-10-and-6-0-0-6-3-2-log4j-cve-2021-44228-cve-2021-45046-remediation/292054");
  script_xref(name:"URL", value:"https://logging.apache.org/log4j/2.x/security.html");
  script_xref(name:"URL", value:"https://github.com/advisories/GHSA-jfh8-c2jp-5v3q");
  script_xref(name:"URL", value:"https://github.com/advisories/GHSA-7rjr-3q55-vv33");
  script_xref(name:"URL", value:"https://www.openwall.com/lists/oss-security/2021/12/10/1");
  script_xref(name:"URL", value:"https://www.openwall.com/lists/oss-security/2021/12/14/4");
  script_xref(name:"URL", value:"https://www.lunasec.io/docs/blog/log4j-zero-day/");
  script_xref(name:"URL", value:"https://www.lunasec.io/docs/blog/log4j-zero-day-update-on-cve-2021-45046/");
  script_xref(name:"URL", value:"https://www.cisa.gov/known-exploited-vulnerabilities-catalog");
  script_xref(name:"CISA", value:"Known Exploited Vulnerability (KEV) catalog");

  exit(0);
}

include("host_details.inc");
include("version_func.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"];
location = infos["location"];

if (version_in_range(version: version, test_version: "5.0", test_version2: "6.8.20")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "6.8.21", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range(version: version, test_version: "7.0", test_version2: "7.16.0")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "7.16.1", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);