Python Library Werkzeug < 3.1.9 DoS (CVE-2026-102598)

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

include('compat.inc');

if (description)
{
  script_id(371389);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/27");

  script_cve_id("CVE-2026-102598");
  script_xref(name:"IAVB", value:"2026-B-0301");

  script_name(english:"Python Library Werkzeug < 3.1.9 DoS (CVE-2026-102598)");

  script_set_attribute(attribute:"synopsis", value:
"A Python library installed on the remote Windows host is affected by a denial of service vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of the Werkzeug Python package installed on the remote Windows host is prior to 3.1.9. It is, therefore,
affected by a denial of service vulnerability:

  - Werkzeug is a WSGI web application library. Prior to 3.1.9, the safe_join function used by send_from_directory can
    allow a NUL: special-device path because safe_join checks the Windows device name without first removing an empty
    NTFS ADS marker. An application that runs on Windows with NTFS and serves a user-specified path ending in a special
    device name such as NUL: can cause the special device to open successfully and the file read to hang indefinitely.
    (CVE-2026-102598)

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/pallets/werkzeug/security/advisories/GHSA-g6x2-hccm-hh4m
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?686127cf");
  script_set_attribute(attribute:"see_also", value:"https://github.com/pallets/werkzeug/releases/tag/3.1.9");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Werkzeug version 3.1.9 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  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:N/S:U/C:N/I:N/A:L");
  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:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-102598");
  script_set_attribute(attribute:"cvss_score_rationale", value:"Score based on the vendor CVSSv4 vector (availability-only impact, VA:L).");
  script_set_attribute(attribute:"cvss3_score_rationale", value:"Score based on the vendor CVSSv4 vector (availability-only impact, VA:L).");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(67);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/09/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/23");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"asset_categories", value:"component");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:palletsprojects:werkzeug");
  script_set_attribute(attribute:"stig_severity", value:"II");
  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) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("python_packages_win_installed.nbin");
  script_require_ports("Host/win/Python/Packages/Enumerated", "SMB/Registry/Enumerated");

  exit(0);
}

include('python.inc');

var pkg, libs, constraints;

pkg = 'Werkzeug';

libs = python::get_package_info(pkg_name:pkg, cpe:"cpe:/a:palletsprojects:werkzeug");

if (empty_or_null(libs))
  audit(AUDIT_NOT_INST, pkg);

vcf::check_all_backporting(app_info:libs);

constraints = [
  { 'fixed_version' : '3.1.9' }
];

vcf::check_version_and_report(
  app_info:libs,
  constraints:constraints,
  severity:SECURITY_WARNING
);