Fortinet FortiOS Privilege Escalation (FG-IR-20-131)

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

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

if (description)
{
  script_id(156783);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/09/19");

  script_cve_id("CVE-2021-26110");
  script_xref(name:"IAVA", value:"2021-A-0574-S");

  script_name(english:"Fortinet FortiOS Privilege Escalation (FG-IR-20-131)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by a privilege escalation vulnerability.");
  script_set_attribute(attribute:"description", value:
"The remote host is running a version of FortiOS prior or equal to 6.0.12, 6.2.x prior or equal to 6.2.9, 6.4.x prior 
or equal to 6.4.6, 7.0.0 or FortiOS-6K7K version prior or equal to 6.2.6, 6.4.2. It is, therefore, affected by a 
privilege escalation vulnerability in FortiOS autod daemon, which may allow an authenticated low-privileged attacker to 
escalate their privileges to super_admin via a specific crafted configuration of fabric automation CLI script and 
auto-script features.

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-20-131");
  script_set_attribute(attribute:"solution", value:
"See vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/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-2021-26110");

  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:"2022/01/18");

  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');

# Please 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 or 6.4.8var constraints;
vcf::fortios::verify_product_and_model(product_name:'FortiGate');

if (model =~ "(18|38|42|44)00F")
  constraints = [
    { 'min_version': '0.0', 'fixed_version' : '6.2.9' },
    { 'min_version': '6.4', 'fixed_version' : '6.4.8' }
  ];

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' : '6.0.13' },
    { 'min_version': '6.2', 'fixed_version' : '6.2.10' },
    { 'min_version': '6.4', 'fixed_version' : '6.4.7' },
    { 'min_version': '7.0', 'fixed_version' : '7.0.1' },
  ];

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