PHP <= 7.1.5 Multiple DoS Vulnerabilities

# 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:php:php";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.117799");
  script_version("2025-09-24T05:39:03+0000");
  script_tag(name:"last_modification", value:"2025-09-24 05:39:03 +0000 (Wed, 24 Sep 2025)");
  script_tag(name:"creation_date", value:"2021-11-26 14:03:35 +0000 (Fri, 26 Nov 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:3.0/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:"2019-03-19 19:40:00 +0000 (Tue, 19 Mar 2019)");

  script_cve_id("CVE-2017-8923", "CVE-2017-9119");

  # nb: Unclear affected / fixed versions so a low QoD was chosen.
  script_tag(name:"qod_type", value:"remote_banner_unreliable");

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

  script_name("PHP <= 7.1.5 Multiple DoS Vulnerabilities");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("gb_php_consolidation.nasl");
  script_mandatory_keys("php/detected");

  script_tag(name:"summary", value:"PHP is prone to multiple denial of service (DoS)
  vulnerabilities.");

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

  script_tag(name:"insight", value:"The following flaws exist:

  - CVE-2017-8923: The zend_string_extend function in Zend/zend_string.h does not prevent changes to
  string objects that result in a negative length, which allows remote attackers to cause a denial
  of service (application crash) or possibly have unspecified other impact by leveraging a script's
  use of .= with a long string.

  - CVE-2017-9119: The i_zval_ptr_dtor function in Zend/zend_variables.h allows attackers to cause a
  denial of service (memory consumption and application crash) or possibly have unspecified other
  impact by triggering crafted operations on array data structures.");

  script_tag(name:"affected", value:"PHP versions through 7.1.5.");

  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://bugs.php.net/bug.php?id=73122");
  script_xref(name:"URL", value:"https://bugs.php.net/bug.php?id=74310");
  script_xref(name:"URL", value:"https://bugs.php.net/bug.php?id=74577");
  script_xref(name:"URL", value:"https://bugs.php.net/bug.php?id=74593");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/98518");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/98596");

  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: "7.1.5")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "None", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(0);