Fortinet FortiProxy 7.2.x / 7.4.x / 7.6.x < 7.6.7 NULL Pointer Dereference in httpsd (FG-IR-26-173)

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

include('compat.inc');

if (description)
{
  script_id(348164);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/21");

  script_cve_id("CVE-2026-84392");
  script_xref(name:"IAVA", value:"2026-A-1004");

  script_name(english:"Fortinet FortiProxy 7.2.x / 7.4.x / 7.6.x < 7.6.7 NULL Pointer Dereference in httpsd (FG-IR-26-173)");

  script_set_attribute(attribute:"synopsis", value:
"The version of FortiProxy installed on the remote host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The version of FortiProxy installed on the remote host is prior to tested version. It is, therefore, affected by a
vulnerability as referenced in the FG-IR-26-173 advisory.

  - A NULL Pointer Dereference vulnerability [CWE-476] in Fortinet FortiProxy 7.6.0 through 7.6.6, FortiProxy
    7.4 all versions, FortiProxy 7.2 all versions may allow an authenticated attacker to crash the httpsd
    daemon via crafted HTTP requests. (CVE-2026-84392)

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-26-173");
  script_set_attribute(attribute:"solution", value:
"Upgrade to FortiProxy version 7.6.7 or later. No fix is available within the 7.2.x or 7.4.x branches.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:M/C:N/I:N/A:P");
  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:H/UI:N/S:U/C:N/I:N/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-84392");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(476);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/09/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:fortinet:fortiproxy");
  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/FortiProxy/version");

  exit(0);
}

include('vcf_extras_fortios.inc');

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

var constraints = [
  { 'min_version' : '7.2.0', 'max_version' : '7.2.16', 'fixed_display' : 'Upgrade to FortiProxy 7.6.7 or later' },
  { 'min_version' : '7.4.0', 'max_version' : '7.4.14', 'fixed_display' : 'Upgrade to FortiProxy 7.6.7 or later' },
  { 'min_version' : '7.6.0', 'max_version' : '7.6.6', 'fixed_version' : '7.6.7', 'fixed_display' : 'Upgrade to FortiProxy 7.6.7 or later' }
];

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