Elastic X-Pack Security SAML Vulnerability (ESA-2018-07)

# 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:x-pack";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.117171");
  script_version("2025-09-03T14:11:39+0000");
  script_tag(name:"last_modification", value:"2025-09-03 14:11:39 +0000 (Wed, 03 Sep 2025)");
  script_tag(name:"creation_date", value:"2021-01-19 14:15:51 +0000 (Tue, 19 Jan 2021)");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2023-03-24 17:29:00 +0000 (Fri, 24 Mar 2023)");

  script_cve_id("CVE-2018-3822");

  script_tag(name:"qod_type", value:"remote_banner_unreliable"); # nb: Preconditions couldn't apply

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

  script_name("Elastic X-Pack Security SAML Vulnerability (ESA-2018-07)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_elastic_kibana_http_detect.nasl");
  script_mandatory_keys("elastic/kibana/x-pack/detected");

  script_tag(name:"summary", value:"Elastic X-Pack Security is prone to a vulnerability in the
  SAML implementation.");

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

  script_tag(name:"insight", value:"X-Pack Security is vulnerable to a user impersonation attack
  via incorrect XML canonicalization and DOM traversal.");

  script_tag(name:"impact", value:"An attacker might have been able to impersonate a legitimate user if
  the SAML Identity Provider allows for self registration with arbitrary identifiers and the attacker
  can register an account with an identifier that shares a suffix with a legitimate account. Both of
  those conditions must be true in order to exploit this flaw.");

  script_tag(name:"affected", value:"X-Pack Security 6.2.0, 6.2.1, and 6.2.2.");

  script_tag(name:"solution", value:"Update to Elasticsearch version 6.2.3 or later.");

  script_xref(name:"URL", value:"https://discuss.elastic.co/t/elastic-stack-6-2-3-security-update/124848");
  script_xref(name:"URL", value:"https://www.elastic.co/community/security");

  exit(0);
}

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

if (!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: "6.2.0", test_version2: "6.2.2")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "6.2.3", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);