nginx < 1.13.6 Buffer Overflow Vulnerability

# Copyright (C) 2021 Greenbone Networks GmbH
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#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
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# This program is distributed in the hope that it will be useful,
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
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CPE = "cpe:/a:nginx:nginx";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.117471");
  script_version("2021-08-17T14:01:00+0000");
  script_tag(name:"last_modification", value:"2021-08-17 14:01:00 +0000 (Tue, 17 Aug 2021)");
  script_tag(name:"creation_date", value:"2021-06-08 12:25:47 +0000 (Tue, 08 Jun 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:"2021-06-14 13:53:00 +0000 (Mon, 14 Jun 2021)");

  script_cve_id("CVE-2017-20005");

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

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

  script_name("nginx < 1.13.6 Buffer Overflow Vulnerability");

  script_category(ACT_GATHER_INFO);

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

  script_tag(name:"summary", value:"nginx is prone to a buffer overflow vulnerability.");

  script_tag(name:"insight", value:"The buffer overflow exists for years that exceed four digits, as
  demonstrated by a file with a modification date in 1969 that causes an integer overflow (or a
  false modification date far in the future), when encountered by the autoindex module.");

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

  script_tag(name:"affected", value:"nginx before version 1.13.6.");

  script_tag(name:"solution", value:"Update to version 1.13.6 or later.");

  script_xref(name:"URL", value:"https://trac.nginx.org/nginx/ticket/1368");
  script_xref(name:"URL", value:"https://github.com/nginx/nginx/commit/0206ebe76f748bb39d9de4dd4b3fce777fdfdccf");
  script_xref(name:"URL", value:"https://github.com/nginx/nginx/commit/b900cc28fcbb4cf5a32ab62f80b59292e1c85b4b");

  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( version: version, test_version: "1.13.6" ) ) {
  report = report_fixed_ver( installed_version: version, fixed_version: "1.13.6", install_path: location );
  security_message( port: port, data: report );
  exit( 0 );
}

exit( 99 );