Apache Tomcat 'CGI Servlet' MITM Vulnerability

# SPDX-FileCopyrightText: 2016 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:apache:tomcat";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.808629");
  script_version("2023-07-21T05:05:22+0000");
  script_cve_id("CVE-2016-5388");
  script_tag(name:"cvss_base", value:"5.1");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:H/Au:N/C:P/I:P/A:P");
  script_tag(name:"last_modification", value:"2023-07-21 05:05:22 +0000 (Fri, 21 Jul 2023)");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:H/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:"2020-08-14 11:15:00 +0000 (Fri, 14 Aug 2020)");
  script_tag(name:"creation_date", value:"2016-08-02 11:10:26 +0530 (Tue, 02 Aug 2016)");
  script_tag(name:"qod_type", value:"remote_banner_unreliable");
  script_name("Apache Tomcat 'CGI Servlet' MITM Vulnerability");

  script_tag(name:"summary", value:"Apache Tomcat is prone to a man-in-the-middle (MITM) 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 'CGI Servlet' does
  not protect applications from the presence of untrusted client data in
  the 'HTTP_PROXY' environment variable.");

  script_tag(name:"impact", value:"Successful exploitation will allow remote
  attackers to conduct MITM attacks on internal server subrequests or direct
  the server to initiate connections to arbitrary hosts.");

  script_tag(name:"affected", value:"Apache Tomcat versions 8.5.4 and prior.");

  script_tag(name:"solution", value:"Information is available and linked in the references
  about a configuration or deployment scenario that helps to reduce the risk of the
  vulnerability.");

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

  script_xref(name:"URL", value:"http://www.kb.cert.org/vuls/id/BLUU-ABSLHW");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/91818");
  script_xref(name:"URL", value:"https://www.apache.org/security/asf-httpoxy-response.txt");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2016 Greenbone AG");
  script_family("Web Servers");
  script_dependencies("gb_apache_tomcat_consolidation.nasl");
  script_mandatory_keys("apache/tomcat/detected");

  exit(0);
}

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

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

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

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

if(version_is_less_equal(version:appVer, test_version:"8.5.4")) {
  report = report_fixed_ver(installed_version:appVer, fixed_version:"Mitigation", install_path:path);
  security_message(data:report, port:appPort);
  exit(0);
}