Fortinet Fortigate - SSH authentication bypass when RADIUS authentication is used (FG-IR-22-255)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(179479);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/08/08");

  script_cve_id("CVE-2022-35843");
  script_xref(name:"IAVA", value:"2022-A-0458-S");

  script_name(english:"Fortinet Fortigate - SSH authentication bypass when RADIUS authentication is used (FG-IR-22-255)");

  script_set_attribute(attribute:"synopsis", value:
"Fortinet Firewall is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The version of Fortigate installed on the remote host is prior to tested version. It is, therefore, affected by a
vulnerability as referenced in the FG-IR-22-255 advisory.

  - An authentication bypass by assumed-immutable data vulnerability [CWE-302] in the FortiOS SSH login
    component 7.2.0, 7.0.0 through 7.0.7, 6.4.0 through 6.4.9, 6.2 all versions, 6.0 all versions and
    FortiProxy SSH login component 7.0.0 through 7.0.5, 2.0.0 through 2.0.10, 1.2.0 all versions may allow a
    remote and unauthenticated attacker to login into the device via sending specially crafted Access-
    Challenge response from the Radius server. (CVE-2022-35843)

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-22-255");
  script_set_attribute(attribute:"solution", value:
"Please upgrade to FortiOS version 7.2.2 or above
Please upgrade to FortiOS version 7.0.8 or above
Please upgrade to FortiOS version 6.4.10 or above
Please upgrade to upcoming FortiOS version 6.2.13 or above
Please upgrade to FortiProxy version 7.0.7 or above
Please upgrade to FortiProxy version 2.0.11 or above");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  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:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-35843");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2022/11/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/12/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/08/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:fortinet:fortiproxy");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

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

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

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

  exit(0);
}

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

var app_name = 'Fortigate';
var app_info = vcf::get_app_info(app:app_name, kb_ver:'Host/Fortigate/version');
vcf::fortios::verify_product_and_model(product_name:app_name);

var constraints = [
  { 'min_version' : '6.2.0', 'max_version' : '6.2.12', 'fixed_version' : '6.2.13' },
  { 'min_version' : '6.4.0', 'max_version' : '6.4.9', 'fixed_version' : '6.4.10' },
  { 'min_version' : '7.0.0', 'max_version' : '7.0.7', 'fixed_version' : '7.0.8' },
  { 'min_version' : '7.2.0', 'max_version' : '7.2.1', 'fixed_version' : '7.2.2' }
];

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