PHP 7.0.x < 7.0.23, 7.1.x < 7.1.9 Use-After-Free Vulnerability - Linux

# Copyright (C) 2021 Greenbone Networks GmbH
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# source(s), and are Copyright (C) by the respective right holder(s).
#
# 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
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

CPE = "cpe:/a:php:php";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.117807");
  script_version("2021-11-29T14:44:44+0000");
  script_tag(name:"last_modification", value:"2021-11-29 14:44:44 +0000 (Mon, 29 Nov 2021)");
  script_tag(name:"creation_date", value:"2021-11-29 12:51:55 +0000 (Mon, 29 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:"2018-05-04 01:29:00 +0000 (Fri, 04 May 2018)");

  script_cve_id("CVE-2017-12932");

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

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

  script_name("PHP 7.0.x < 7.0.23, 7.1.x < 7.1.9 Use-After-Free Vulnerability - Linux");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
  script_family("Web application abuses");
  script_dependencies("gb_php_ssh_login_detect.nasl", "gb_php_http_detect.nasl", "os_detection.nasl");
  script_mandatory_keys("php/detected", "Host/runs_unixoide");

  script_tag(name:"summary", value:"PHP is prone to a use-after-free vulnerability.");

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

  script_tag(name:"insight", value:"ext/standard/var_unserializer.re is prone to a heap use after
  free while unserializing untrusted data, related to improper use of the hash API for key deletion
  in a situation with an invalid array size. Exploitation of this issue can have an unspecified
  impact on the integrity of PHP.");

  script_tag(name:"affected", value:"PHP versions 7.0.x prior to 7.0.23 and 7.1.x prior to 7.1.9.");

  script_tag(name:"solution", value:"Update to version 7.0.23, 7.1.9 or later.");

  script_xref(name:"URL", value:"https://www.php.net/ChangeLog-7.php#7.1.9");
  script_xref(name:"URL", value:"https://www.php.net/ChangeLog-7.php#7.0.23");
  script_xref(name:"URL", value:"https://bugs.php.net/bug.php?id=74103");

  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_in_range(version: version, test_version: "7.0", test_version2: "7.0.22")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "7.0.23", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range(version: version, test_version: "7.1", test_version2: "7.1.8")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "7.1.9", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);