Devolutions Remote Desktop Manager 2026.1.x < 2026.1.25.0 / 2026.2.x < 2026.2.18.0 Insufficient Data Authenticity Verification (CVE-2026-78417)

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

include('compat.inc');

if (description)
{
  script_id(341349);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/02");

  script_cve_id("CVE-2026-78417");

  script_name(english:"Devolutions Remote Desktop Manager 2026.1.x < 2026.1.25.0 / 2026.2.x < 2026.2.18.0 Insufficient Data Authenticity Verification (CVE-2026-78417)");

  script_set_attribute(attribute:"synopsis", value:
"The Devolutions Remote Desktop Manager instance installed on the remote host is affected by an insufficient data
authenticity verification vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Devolutions Remote Desktop Manager installed on the remote host is 2026.1.x prior to 2026.1.25.0 or
2026.2.x prior to 2026.2.18.0. It is, therefore, affected by a vulnerability:

  - Insufficient verification of data authenticity in the IronVNC client allows an on-path attacker to intercept and
    tamper with VNC sessions via automatic acceptance of the server's RSA key during RSA-AES authentication.
    (CVE-2026-78417)

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://devolutions.net/security/advisories/DEVO-2026-0029/");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Devolutions Remote Desktop Manager version 2026.1.25.0 / 2026.2.18.0 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/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:N/UI:R/S:U/C:N/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:H/SI:L/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-78417");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(345);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/28");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/a:devolutions:remote_desktop_manager");
  script_end_attributes();

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

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

  script_dependencies("devolutions_desktop_manager_win_installed.nbin");
  script_require_keys("installed_sw/Devolutions Remote Desktop Manager");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'requires': [
    {'scope': 'target', 'match': {'os': 'windows'}}
  ],
  'checks': [
    {
      'product': {'name': 'Devolutions Remote Desktop Manager', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'min_version': '2026.1.0', 'fixed_version': '2026.1.25.0'},
        {'min_version': '2026.2.0', 'fixed_version': '2026.2.18.0'}
      ]
    }
  ]
};

var vdf_result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_WARNING);
vdf::handle_check_and_report_errors(vdf_result:vdf_result);