PHP 7.4.x < 7.4.5 urldecode OOB Read

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

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

if (description)
{
  script_id(135969);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/14");

  script_cve_id("CVE-2020-7067");
  script_xref(name:"IAVA", value:"2020-A-0169-S");

  script_name(english:"PHP 7.4.x < 7.4.5 urldecode OOB Read");

  script_set_attribute(attribute:"synopsis", value:
"The version of PHP running on the remote web server is affected by an out-of-bounds read vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version number, the version of PHP running on the remote web server is 7.4.x prior to 
7.4.5. It is, therefore, affected by an out-of-bounds read error in urldecode() due to improper data validation checks. 
An attacker can exploit this, by inserting negative hex values to leak values that are found in the memory before the
array.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://www.php.net/ChangeLog-7.php
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?948f4dd6");
  # https://bugs.php.net/bug.php?id=79465
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a7727efb");
  script_set_attribute(attribute:"solution", value:
"Upgrade to PHP version 7.4.5 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-7067");

  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:"2020/04/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/04/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/24");

  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) 2020-2024 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('http.inc');
include('vcf.inc');

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

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');

constraints = [{'min_version':'7.4.0alpha1', 'fixed_version':'7.4.5'}];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);