Elastic Kibana X-Pack 'CVE-2017-8438' Privilege Escalation Vulnerability - Linux

# SPDX-FileCopyrightText: 2017 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("1.3.6.1.4.1.25623.1.0.108261");
  script_version("2025-09-03T14:11:39+0000");
  script_cve_id("CVE-2017-8438");
  script_tag(name:"cvss_base", value:"6.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_tag(name:"last_modification", value:"2025-09-03 14:11:39 +0000 (Wed, 03 Sep 2025)");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2019-10-09 23:30:00 +0000 (Wed, 09 Oct 2019)");
  script_tag(name:"creation_date", value:"2017-10-23 10:54:29 +0200 (Mon, 23 Oct 2017)");
  script_name("Elastic Kibana X-Pack 'CVE-2017-8438' Privilege Escalation Vulnerability - Linux");
  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_category(ACT_GATHER_INFO);
  script_family("Web application abuses");
  script_dependencies("gb_elastic_kibana_http_detect.nasl", "os_detection.nasl");
  script_mandatory_keys("elastic/kibana/x-pack/detected", "Host/runs_unixoide");

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

  script_tag(name:"summary", value:"Elastic Kibana with X-Pack is prone to a privilege escalation 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 a privilege escalation bug in the run_as functionality.
  This bug prevents transitioning into the specified user specified in a run_as request. If a role has been
  created using a template that contains the _user properties, the behavior of run_as will be incorrect.
  Additionally if the run_as user specified does not exist, the transition will not happen.");

  script_tag(name:"affected", value:"Elastic Kibana X-Pack versions 5.0.0 to 5.4.0.");

  script_tag(name:"solution", value:"Update to Elastic Kibana X-Pack version 5.4.1 or later.");

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

  exit(0);
}

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

if( ! port = get_app_port( cpe:CPE ) ) exit( 0 );
if( ! vers = get_app_version( cpe:CPE, port:port ) ) exit( 0 );

if( version_in_range( version:vers, test_version:"5.0.0", test_version2:"5.4.0" ) ) {
  report = report_fixed_ver( installed_version:vers, fixed_version:"5.4.1" );
  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );