Fortinet FortiWeb Open redirect due to missing domain whitelisting (FG-IR-21-133)

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

include('compat.inc');

if (description)
{
  script_id(209725);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/10/28");

  script_cve_id("CVE-2021-36191");

  script_name(english:"Fortinet FortiWeb Open redirect due to missing domain whitelisting (FG-IR-21-133)");

  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 FortiWeb installed on the remote host is prior to tested version. It is, therefore, affected by a
vulnerability as referenced in the FG-IR-21-133 advisory.

  - A url redirection to untrusted site ('open redirect') in Fortinet FortiWeb version 6.4.1 and below, 6.3.15
    and below allows attacker to use the device as proxy via crafted GET parameters in requests to error
    handlers (CVE-2021-36191)

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-21-133");
  script_set_attribute(attribute:"solution", value:
"Please upgrade to FortiWeb version 6.3.16/6.4.2/7.0.0 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:P/I:P/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:L/UI:R/S:C/C:L/I:L/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-2021-36191");

  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:"2021/12/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/10/26");

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

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

  script_copyright(english:"This script is Copyright (C) 2024 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 = 'FortiWeb';
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' : '6.0.0', 'max_version' : '6.0.7', 'fixed_version' : '6.3.16' },
  { 'min_version' : '6.1.0', 'max_version' : '6.1.2', 'fixed_version' : '6.3.16' },
  { 'min_version' : '6.2.0', 'max_version' : '6.2.7', 'fixed_version' : '6.3.16' },
  { 'min_version' : '6.3.0', 'max_version' : '6.3.15', 'fixed_version' : '6.3.16' },
  { 'min_version' : '6.4.0', 'max_version' : '6.4.1', 'fixed_version' : '6.4.2' }
];

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