Citrix Secure Access < 26.6.1.20 Multiple Vulnerabilities (CTX696734)

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

include('compat.inc');

if (description)
{
  script_id(331858);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/04");

  script_cve_id("CVE-2026-53565", "CVE-2026-53566");
  script_xref(name:"IAVA", value:"2026-A-0703");

  script_name(english:"Citrix Secure Access < 26.6.1.20 Multiple Vulnerabilities (CTX696734)");

  script_set_attribute(attribute:"synopsis", value:
"Citrix Secure Access installed on the remote Windows host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Citrix Secure Access installed on the remote host is prior to 26.6.1.20. It is,
therefore, affected by multiple vulnerabilities:

  - An improper privilege management vulnerability allows a low-privileged user to escalate
    privileges. (CVE-2026-53565)

  - An out-of-bounds read vulnerability allows a low-privileged user to read sensitive
    information. (CVE-2026-53566)

Note that Nessus has not tested for these issues but has instead relied only on the application's
self-reported version number.");
  # https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696734
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f7807398");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Citrix Secure Access Client for Windows version 26.6.1.20 or later.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-53565");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/07/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:citrix:secure_access");
  script_set_attribute(attribute:"stig_severity", value:"I");
  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("citrix_gateway_plug-in_detect.nbin");
  script_require_keys("installed_sw/Citrix Gateway Plug-in");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'requires': [
    {'scope': 'target', 'match': {'os': 'windows'}}
  ],
  'checks': [
    {
      'product': {'name': 'Citrix Gateway Plug-in', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'fixed_version': '26.6.1.20'}
      ]
    }
  ]
};

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