nginx <= 1.21.1 Information Disclosure Vulnerability

# Copyright (C) 2021 Greenbone Networks GmbH
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# SPDX-License-Identifier: GPL-2.0-or-later
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# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
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CPE = "cpe:/a:nginx:nginx";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.117523");
  script_version("2022-08-08T10:24:51+0000");
  script_tag(name:"last_modification", value:"2022-08-08 10:24:51 +0000 (Mon, 08 Aug 2022)");
  script_tag(name:"creation_date", value:"2021-07-01 11:23:40 +0000 (Thu, 01 Jul 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_cve_id("CVE-2013-0337");

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

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

  script_name("nginx <= 1.21.1 Information Disclosure Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
  script_family("Web Servers");
  script_dependencies("gb_nginx_consolidation.nasl", "os_detection.nasl");
  script_mandatory_keys("nginx/detected", "Host/runs_unixoide");

  script_tag(name:"summary", value:"nginx is prone to an information disclosure vulnerability.");

  script_tag(name:"insight", value:"The default configuration of nginx uses world-readable
  permissions for the access.log and error.log files, which allows local users to obtain sensitive
  information by reading the files.");

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

  script_tag(name:"affected", value:"nginx up to the most recent version 1.21.1.");

  script_tag(name:"solution", value:"No known solution was made available for at least one year since
  the disclosure of this vulnerability. Likely none will be provided anymore. General solution options
  are to upgrade to a newer release, disable respective features, remove the product or replace the
  product by another one.");

  script_xref(name:"URL", value:"https://trac.nginx.org/nginx/ticket/376");

  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_is_less_equal( version: version, test_version: "1.21.1" ) ) {
  report = report_fixed_ver( installed_version: version, fixed_version: "None", install_path: location );
  security_message( port: port, data: report );
  exit( 0 );
}

exit( 0 );