PHP 8.1.x < 8.1.0 Multiple Vulnerabilities

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(155730);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/22");

  script_cve_id("CVE-2021-21703", "CVE-2021-21706", "CVE-2021-21707");
  script_xref(name:"IAVA", value:"2021-A-0503-S");
  script_xref(name:"IAVA", value:"2021-A-0566-S");

  script_name(english:"PHP 8.1.x < 8.1.0 Multiple Vulnerabilities");

  script_set_attribute(attribute:"synopsis", value:
"The version PHP running on the remote web server is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of PHP installed on the remote host is prior to 8.1.0. It is, therefore, affected by multiple
vulnerabilities as referenced in the Version 8.1.0 advisory.

  - In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running
    PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-
    privileged users, it is possible for the child processes to access memory shared with the main process and
    write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and
    writes, which can be used to escalate privileges from local unprivileged user to the root user.
    (CVE-2021-21703)

  - In PHP versions 7.3.x below 7.3.31, 7.4.x below 7.4.24 and 8.0.x below 8.0.11, in Microsoft Windows
    environment, ZipArchive::extractTo may be tricked into writing a file outside target directory when
    extracting a ZIP file, thus potentially causing files to be created or overwritten, subject to OS
    permissions. (CVE-2021-21706)

  - In PHP versions 7.3.x below 7.3.33, 7.4.x below 7.4.26 and 8.0.x below 8.0.13, certain XML parsing
    functions, like simplexml_load_file(), URL-decode the filename passed to them. If that filename contains
    URL-encoded NUL character, this may cause the function to interpret this as the end of the filename, thus
    interpreting the filename differently from what the user intended, which may lead it to reading a
    different file than intended. (CVE-2021-21707)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"http://bugs.php.net/79971");
  script_set_attribute(attribute:"see_also", value:"http://bugs.php.net/81026");
  script_set_attribute(attribute:"see_also", value:"http://bugs.php.net/81420");
  script_set_attribute(attribute:"see_also", value:"http://php.net/ChangeLog-8.php#8.1.0");
  script_set_attribute(attribute:"solution", value:
"Upgrade to PHP version 8.1.0 or later.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-21703");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/10/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/11/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/11/30");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:php:php");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("php_version.nasl");
  script_require_keys("www/PHP", "installed_sw/PHP");
  script_require_ports("Services/www", 80);

  exit(0);
}

include('vcf.inc');
include('http.inc');

var port = get_http_port(default:80, php:TRUE);
var app_info = vcf::get_app_info(app:'PHP', port:port, webapp:TRUE);

var backported = get_kb_item('www/php/' + port + '/' + app_info.version + '/backported');
if ((report_paranoia < 2) && backported)
  audit(AUDIT_BACKPORT_SERVICE, port, 'PHP ' + app_info.version + ' install');

var constraints = [
  { 'min_version' : '8.1.0alpha1', 'fixed_version' : '8.1.0' }
];
vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);