Fortinet Fortigate Path traversal in CLI command allows deletion of root file system (FG-IR-26-151)

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

include('compat.inc');

if (description)
{
  script_id(326772);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/31");

  script_cve_id("CVE-2026-59839");
  script_xref(name:"IAVA", value:"2026-A-0738");

  script_name(english:"Fortinet Fortigate Path traversal in CLI command allows deletion of root file system (FG-IR-26-151)");

  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-26-151 advisory.

  - A improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet
    FortiOS 7.6.0 through 7.6.6, FortiOS 7.4.0 through 7.4.9, FortiOS 7.2 all versions, FortiOS 7.0 all
    versions, FortiOS 6.4 all versions, FortiPAM 1.8.0, FortiPAM 1.7.0 through 1.7.2, FortiPAM 1.6 all
    versions, FortiPAM 1.5 all versions, FortiPAM 1.4 all versions, FortiPAM 1.3 all versions, FortiPAM 1.2
    all versions, FortiPAM 1.1 all versions, FortiPAM 1.0 all versions, FortiProxy 7.6.0 through 7.6.5,
    FortiProxy 7.4 through 7.4.13, FortiProxy 7.2 all versions, FortiProxy 7.0 all versions may allow attacker
    to execute unauthorized code or commands via <insert attack vector here> (CVE-2026-59839)

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-26-151");
  script_set_attribute(attribute:"solution", value:
"For 6.4.x / 7.0.x / 7.2.x, see vendor advisory. For 7.4.x, upgrade to Fortigate version 7.4.10 or later. For 7.6.x,
upgrade to Fortigate version 7.6.7 or later.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:M/C:N/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:P/AC:L/PR:H/UI:N/S:U/C:N/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-2026-59839");

  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:"2026/07/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fortinet:fortios");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  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) 2026 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_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' : '6.4', 'fixed_version' : '6.4.999999', 'fixed_display' : 'See vendor advisory' },
  { 'min_version' : '7.0', 'fixed_version' : '7.0.999999', 'fixed_display' : 'See vendor advisory' },
  { 'min_version' : '7.2', 'fixed_version' : '7.2.999999', 'fixed_display' : 'See vendor advisory' },
  { 'min_version' : '7.4.0', 'max_version' : '7.4.9.999999', 'fixed_version' : '7.4.10' },
  { 'min_version' : '7.6.0', 'max_version' : '7.6.6.999999', 'fixed_version' : '7.6.7', 'fixed_display' : 'Upgrade to upcoming 7.6.7 or above' }
];

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