Citrix ADC and Citrix Gateway Session Hijack (CTX319135)

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

include('compat.inc');

if (description)
{
  script_id(166616);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/04/07");

  script_cve_id("CVE-2021-22920");

  script_name(english:"Citrix ADC and Citrix Gateway Session Hijack (CTX319135)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is may be affected by a session hijack vulnerability.");
  script_set_attribute(attribute:"description", value:
"The remote Citrix ADC or Citrix Gateway device is version 12.1 before 12.1-62.25 or 13.0 before 13.0-82.42. It is 
therefore affected by a session hijack vulnerability that, if exploited, could lead to a phishing attack through a 
SAML authentication hijack to steal a valid user session.

Please refer to advisory CTX319135 for more information.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://support.citrix.com/article/CTX319135");
  script_set_attribute(attribute:"solution", value:
"Upgrade to version 11.1-65.22, 12.1-62.27, 13.0-82.45 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N");
  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:R/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-22920");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/07/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/07/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/10/27");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  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) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}

include('vcf_extras_netscaler.inc');

if (report_paranoia < 2) audit(AUDIT_PARANOID);

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

var constraints = [
  {'min_version': '12.1', 'fixed_version': '12.1.62.25', 'fixed_display': '12.1-62.25'},
  {'min_version': '13.0', 'fixed_version': '13.0.82.42', 'fixed_display': '13.0-82.42'}
];

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