PHP 7.4.x < 7.4.28

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

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

if (description)
{
  script_id(158133);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/08");

  script_cve_id("CVE-2021-21708");

  script_name(english:"PHP 7.4.x < 7.4.28");

  script_set_attribute(attribute:"synopsis", value:
"The version PHP running on the remote web server is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of PHP installed on the remote host is prior to 7.4.28. It is, therefore, affected by a vulnerability as
referenced in the Version 7.4.28 advisory.

  - In PHP versions 7.4.x below 7.4.28, 8.0.x below 8.0.16, and 8.1.x below 8.1.3, when using filter functions
    with FILTER_VALIDATE_FLOAT filter and min/max limits, if the filter fails, there is a possibility to
    trigger use of allocated memory after free, which can result it crashes, and potentially in overwrite of
    other memory chunks and RCE. This issue affects: code that uses FILTER_VALIDATE_FLOAT with min/max limits.
    (CVE-2021-21708)

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://php.net/ChangeLog-7.php#7.4.28");
  script_set_attribute(attribute:"solution", value:
"Upgrade to PHP version 7.4.28 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/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-2021-21708");

  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:"2022/02/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/02/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/02/17");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:php:php");
  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) 2022-2023 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' : '7.4.0alpha1', 'fixed_version' : '7.4.28' }
];
vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);