pyOpenSSL 0.14.x < 26.0.0 Security Bypass

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

include('compat.inc');

if (description)
{
  script_id(318386);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/03");

  script_cve_id("CVE-2026-27448");
  script_xref(name:"IAVA", value:"2026-A-0248");

  script_name(english:"pyOpenSSL 0.14.x < 26.0.0 Security Bypass");

  script_set_attribute(attribute:"synopsis", value:
"A Python library installed on the remote host is affected by a security bypass vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of pyOpenSSL installed on the remote host is prior to 26.0.0. It is, therefore, affected by a security
bypass vulnerability:

  - pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0,
    if a user provided callback to set_tlsext_servername_callback raised an unhandled exception, this would result in a
    connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could
    allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.
    (CVE-2026-27448)

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/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9be3fb16");
  # https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f411998f");
  script_set_attribute(attribute:"solution", value:
"Upgrade to pyOpenSSL version 26.0.0 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-27448");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/03/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/03/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:pyopenssl:pyopenssl");
  script_set_attribute(attribute:"stig_severity", value:"I");
  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("python_packages_installed_nix.nbin", "python_packages_win_installed.nbin");
  script_require_ports("Host/nix/Python/Packages/Enumerated", "Host/win/Python/Packages/Enumerated");

  exit(0);
}

include('python.inc');

var pkg = 'pyOpenSSL';
var cpe = 'cpe:/a:pyopenssl:pyopenssl';

var libs = python::get_package_info(pkg_name:pkg, cpe:cpe);

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

vcf::check_all_backporting(app_info:libs);

var constraints = [
  { 'min_version' : '0.14.0', 'fixed_version' : '26.0.0' }
];

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