Tenable Nessus < 10.11.4 / 10.12.0 Arbitrary File Deletion (TNS-2026-13)

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

include('compat.inc');

if (description)
{
  script_id(311266);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/01");

  script_cve_id("CVE-2026-33694");

  script_name(english:"Tenable Nessus < 10.11.4 / 10.12.0 Arbitrary File Deletion (TNS-2026-13)");

  script_set_attribute(attribute:"synopsis", value:
"An instance of Nessus installed on the remote Windows system is affected by an arbitrary file deletion vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version, the Tenable Nessus application running on the remote Windows host is prior to 10.11.4
or 10.12.0. It is, therefore, affected by an arbitrary file deletion vulnerability as referenced in the TNS-2026-13
advisory.

  - A vulnerability exists in Nessus on Windows where an authenticated attacker could create a junction,
    enabling the deletion of arbitrary files with SYSTEM privileges, potentially facilitating arbitrary code
    execution with elevated permissions. (CVE-2026-33694)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://www.tenable.com/security/TNS-2026-13
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?da741709");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Tenable Nessus 10.11.4, 10.12.0 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H");
  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:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-33694");

  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:"2026/04/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/30");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:tenable:nessus");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

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

  script_dependencies("nessus_detect.nasl", "nessus_installed_win.nbin", "nessus_installed_linux.nbin", "macos_nessus_installed.nbin");
  script_require_keys("installed_sw/Tenable Nessus");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'Tenable Nessus', 'type': 'app'},
      'check_algorithm': 'default',
      'requires': [
        {'scope': 'target', 'match': {'os': 'windows'}}
      ],
      'constraints': [
        {'max_version': '10.11.3', 'fixed_display': '10.11.4 / 10.12.0'}
      ]
    }
  ]
};

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