Fortinet FortiOS Hard-Coded Cryptographic Key (FG-IR-21-051)

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

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

if (description)
{
  script_id(156755);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/09/19");

  script_cve_id("CVE-2021-26108");
  script_xref(name:"IAVA", value:"2021-A-0574-S");

  script_name(english:"Fortinet FortiOS Hard-Coded Cryptographic Key (FG-IR-21-051)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by a hard-coded cryptographic key vulnerability.");
  script_set_attribute(attribute:"description", value:
"The remote host is running a version of FortiOS prior to 5.6.13, 6.0.x prior or equal to 6.0.12, 6.2.x prior or equal 
to 6.2.8, or 6.4.x prior or equal to 6.4.5, FortiOS-6K7K version prior to 6.2.6 and 6.4.2. It is, therefore, affected 
by a hard-coded cryptographic key vulnerability in FortiOS SSLVPN may allow an attacker to retrieve the key by reverse 
engineering.

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.fortiguard.com/psirt/FG-IR-21-051");
  script_set_attribute(attribute:"solution", value:
"See vendor advisory.");
  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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-26108");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/12/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/12/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/01/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fortinet:fortios");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Firewalls");

  script_copyright(english:"This script is Copyright (C) 2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("fortinet_version.nbin");
  script_require_keys("Host/Fortigate/version", "Host/Fortigate/model");

  exit(0);
}


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

var app_name = 'FortiOS';
var app_info = vcf::get_app_info(app:app_name, kb_ver:'Host/Fortigate/version');
var model = get_kb_item_or_exit('Host/Fortigate/model');

# Upgrade to FortiOS-6K7K version 6.2.7 or above.
# For new high-end F-Series Models (FG-1800F, FG-3800F, FG-4200F, FG-4400F) please upgrade to 6.2.9
var constraints = '';

vcf::fortios::verify_product_and_model(product_name:'FortiGate');

if (model =~ "(18|38|42|44)00F")
  constraints = [{ 'fixed_version' : '6.2.9' }];

else if (model =~ "-[6-7][0-9]{3}[A-Z]")
{
  constraints = [
    { 'min_version': '0.0', 'max_version': '6.2.6','fixed_version' : '6.2.7' },
    { 'equal': '6.4.2','fixed_display' : 'See vendor advisory' }
  ];
}

else
  constraints = [
    { 'min_version': '0.0', 'fixed_version' : '5.6.14' },
    { 'min_version': '6.0', 'fixed_version' : '6.0.13' },
    { 'min_version': '6.2', 'fixed_version' : '6.2.10' },
    { 'min_version': '6.4', 'fixed_version' : '6.4.6' }
  ];

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