Kentico Xperience < 13.0.173 Auth Bypass

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

include('compat.inc');

if (description)
{
  script_id(271230);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/23");

  script_cve_id("CVE-2025-2746");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2025/11/10");

  script_name(english:"Kentico Xperience < 13.0.173 Auth Bypass");

  script_set_attribute(attribute:"synopsis", value:
"A web content management system on the remote Windows host is affected by an authentication bypass vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version number, the version of Kentico Xperience on the remote Windows host is prior
to 13.0.173. It is, therefore, affected by an authentication bypass vulnerability via the Staging Sync Server
password handling of empty SHA1 usernames in digest authentication. Authentication bypass allows an attacker
to control administrative objects.

Note that Nessus has not attempted to exploit these issues but has instead relied only on the application's
self-reported version number.");
  script_set_attribute(attribute:"see_also", value:"https://devnet.kentico.com/download/hotfixes");
  # https://labs.watchtowr.com/bypassing-authentication-like-its-the-90s-pre-auth-rce-chain-s-in-kentico-xperience-cms/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?eb33e3b8");
  script_set_attribute(attribute:"solution", value:
"Apply Hotfix 13.0.173 or upgrade to the latest available stable version.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  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-2025-2746");

  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:"2025/01/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/01/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/10/23");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:kentico:kentico_cms");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:kentico:xperience");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("kentico_cms_win_installed.nbin");
  script_require_keys("installed_sw/Kentico CMS", "SMB/Registry/Enumerated");

  exit(0);
}

include('vcf.inc');

var app_info = vcf::combined_get_app_info(app:'Kentico CMS');

# Configuration required: Staging Service needs to be enabled with the username/password authentication
if (report_paranoia < 2) audit(AUDIT_POTENTIAL_VULN);

var constraints = [
  {'fixed_version': '13.0.173.46164', 'fixed_display': 'Hotfix 13.0.173'}
];

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