NetScaler ADC and NetScaler Gateway 13.1 < 13.1-64.23 / 14.1 < 14.1-73.37 Multiple Vulnerabilities

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

include('compat.inc');

if (description)
{
  script_id(350844);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/27");

  script_cve_id(
    "CVE-2026-88771",
    "CVE-2026-88772",
    "CVE-2026-88773",
    "CVE-2026-88774",
    "CVE-2026-88775",
    "CVE-2026-88776",
    "CVE-2026-88777",
    "CVE-2026-88778"
  );

  script_name(english:"NetScaler ADC and NetScaler Gateway 13.1 < 13.1-64.23 / 14.1 < 14.1-73.37 Multiple Vulnerabilities");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The remote NetScaler ADC (formerly Citrix ADC) or NetScaler Gateway (formerly Citrix Gateway) device is
version 13.1 prior to 13.1-64.23, 14.1 prior to 14.1-73.37, 13.1-FIPS/NDcPP prior to 13.1-37.279, or 14.1-FIPS
prior to 14.1-73.37. It is, therefore, affected by multiple vulnerabilities:

  - A remote code execution vulnerability due to improper input validation that can allow an unauthenticated
    attacker to execute arbitrary commands. All NetScaler ADC and NetScaler Gateway deployments, including the
    default configuration, are affected. This vulnerability has been observed to be exploited in the wild.
    (CVE-2026-88771)

  - A memory overflow vulnerability leading to remote code execution or denial of service when DTLS is enabled
    on NetScaler ADC or NetScaler Gateway. This vulnerability has been observed to be exploited in the wild.
    (CVE-2026-88772)

  - An HTTP request smuggling vulnerability affecting deployments that use LB, CS, VPN, or Authentication
    virtual servers of type HTTP or SSL. (CVE-2026-88773)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported
version number.");
  # https://community.citrix.com/techzone-blogs/110_security-updates/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve-2026-88771-through-cve-2026-88778/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f6b07bd9");
  script_set_attribute(attribute:"solution", value:
"Upgrade to NetScaler ADC or NetScaler Gateway version 13.1-64.23, 14.1-73.37, 13.1-37.279-FIPS, 13.1-37.279-NDcPP, or 14.1-73.37-FIPS or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-88771");

  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:"2026/09/27");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/h:citrix:netscaler_gateway");
  script_set_attribute(attribute:"cpe", value:"cpe:/h:citrix:netscaler_application_delivery_controller");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

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

  script_dependencies("citrix_netscaler_detect.nbin");
  script_require_keys("Host/NetScaler/Detected");

  exit(0);
}

include('vcf_extras_netscaler.inc');

var app_info = vcf::citrix_netscaler::get_app_info();

var constraints;

if (app_info['fips_status'] == 1)
  constraints = [
    {'fips':TRUE, 'min_version': '13.1', 'fixed_version': '13.1.37.279', 'fixed_display':'13.1-37.279-FIPS'},
    {'fips':TRUE, 'min_version': '14.1', 'fixed_version': '14.1.73.37', 'fixed_display':'14.1-73.37-FIPS'}
  ];
else
  constraints = [
    {'min_version': '13.1', 'fixed_version': '13.1.64.23', 'fixed_display': '13.1-64.23'},
    {'min_version': '14.1', 'fixed_version': '14.1.73.37', 'fixed_display': '14.1-73.37'}
  ];

vcf::citrix_netscaler::check_version_and_report(
  app_info:app_info,
  constraints:constraints,
  severity:SECURITY_HOLE
);