Dotnetnuke < 10.3.3 Authorization bypass in image processor (GHSA-g8w5-h3rm-g8rj)

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

include('compat.inc');

if (description)
{
  script_id(339645);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/26");

  script_name(english:"Dotnetnuke < 10.3.3 Authorization bypass in image processor (GHSA-g8w5-h3rm-g8rj)");

  script_set_attribute(attribute:"synopsis", value:
"An ASP.NET application running on the remote web server is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version, the instance of Dotnetnuke running on the remote web server is prior to 10.3.3.
It is, therefore, affected by a vulnerability.

  - An authorization vulnerability in the Image Processor could allow an unauthenticated user to access image
    files that were intended to be protected by DNN's file and folder permissions. Sites using restricted or
    secure file storage should upgrade to a patched release to ensure image processing operations consistently
    enforce configured access controls. A vulnerability was identified in the Image Processor where
    authorization checks were not consistently enforced before processing protected image files. Under certain
    conditions, an unauthenticated user could retrieve images stored in locations intended to restrict
    anonymous access. Successful exploitation could disclose sensitive images that administrators expected to
    remain protected by DNN's file authorization model. Depending on how the platform is used, affected images
    could include user-uploaded media, scanned documents, screenshots, branding assets, or other confidential
    visual content. (GHSA-g8w5-h3rm-g8rj)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://github.com/dnnsoftware/Dnn.Platform/security/advisories/GHSA-g8w5-h3rm-g8rj
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?80af2633");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Dotnetnuke version 10.3.3 or later.");
  script_set_attribute(attribute:"risk_factor", value:"High");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(200, 284, 639, 862);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/26");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:dotnetnuke:dotnetnuke");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:dnnsoftware:dotnetnuke");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  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("dotnetnuke_detect.nasl");
  script_require_keys("installed_sw/DNN");
  script_exclude_keys("Settings/disable_cgi_scanning");
  script_require_ports("Services/www", 80);

  exit(0);
}

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

var app = 'DNN';

get_install_count(app_name:app, exit_if_zero:TRUE);

var port = get_http_port(default:80, asp:TRUE);

var app_info = vcf::get_app_info(app:app, port:port, webapp:TRUE);
vcf::check_granularity(app_info:app_info, sig_segments:3);

var constraints = [
  { 'fixed_version' : '10.3.3' }
];

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