PHP 7.3.x < 7.3.17 Out of Bounds Read Vulnerability

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

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

if (description)
{
  script_id(135918);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/15");

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

  script_name(english:"PHP 7.3.x < 7.3.17 Out of Bounds Read Vulnerability");

  script_set_attribute(attribute:"synopsis", value:
"The version of PHP running on the remote web server is affected by 
  multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its banner, the version of PHP running on the remote web server is 7.3.x prior to 7.3.17. It is,
therefore, affected by an out-of-bounds read error in its url decoding component due to insufficient validation of 
user-supplied input. An unauthenticated, remote attacker can exploit this, by sending specially crafted requests, to 
cause a denial of service (DoS) condition or execution of arbitrary code.

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:"https://www.php.net/ChangeLog-7.php#7.3.17");
  script_set_attribute(attribute:"solution", value:
"Upgrade to PHP version 7.3.17 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:"2020/04/23");

  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('audit.inc');
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':'7.3.0alpha1', 'fixed_version':'7.3.17'} ];

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