FreePBX 13.x < 13.0.197.14 / 14.x < 14.0.13.12 / 15.x < 15.0.16.27 Remote Admin Authentication Bypass

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

include('compat.inc');

if (description)
{
  script_id(298040);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/06");

  script_cve_id("CVE-2019-19006");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2026/02/24");

  script_name(english:"FreePBX 13.x < 13.0.197.14 / 14.x < 14.0.13.12 / 15.x < 15.0.16.27 Remote Admin Authentication Bypass");

  script_set_attribute(attribute:"synopsis", value:
"The remote web server hosts a PHP application that is affected by an authentication bypass vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of FreePBX installed on the remote host is 13.x prior to 13.0.197.14, 14.x prior to 14.0.13.12, or 15.x
prior to 15.0.16.27. It is, therefore, affected by an authentication bypass vulnerability:

  - Sangoma FreePBX has incorrect access control that allows unauthenticated remote attackers to bypass
    authentication and gain administrative access to the system. (CVE-2019-19006)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://sangomakb.atlassian.net/wiki/spaces/FP/pages/13271048/FreePBX+Open+Source+-+2019-11-20+Remote+Admin+Authentication+Bypass
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b187623d");
  script_set_attribute(attribute:"solution", value:
"Upgrade to FreePBX version 13.0.197.14, 14.0.13.12, 15.0.16.27, or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:F/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:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-19006");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/11/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/11/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/02/05");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:freepbx:freepbx");
  script_set_attribute(attribute:"enable_cgi_scanning", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("freepbx_detect.nasl");
  script_require_keys("installed_sw/FreePBX");
  script_require_ports("Services/www", 80);

  exit(0);
}

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

var app = 'FreePBX';
get_install_count(app_name:app, exit_if_zero:TRUE);

var port = get_http_port(default:80, php:TRUE);
var app_info = vcf::get_app_info(app:app, port:port, webapp:TRUE);

if (empty_or_null(app_info))
  audit(AUDIT_NOT_INST, app);

# Require 4 version segments to distinguish vulnerable from fixed versions
if (app_info.version =~ "^13\.0\.197($|[^0-9])" ||
    app_info.version =~ "^14\.0\.13($|[^0-9])" ||
    app_info.version =~ "^15\.0\.16($|[^0-9])")
  vcf::check_granularity(app_info:app_info, sig_segments:4);

var constraints = [
  {'min_version': '13.0', 'fixed_version': '13.0.197.14'},
  {'min_version': '14.0', 'fixed_version': '14.0.13.12'},
  {'min_version': '15.0', 'fixed_version': '15.0.16.27'}
];

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