Beckhoff TwinCAT OPC UA Server Path Traversal (CVE-2021-34594)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(500516);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/13");

  script_cve_id("CVE-2021-34594");

  script_name(english:"Beckhoff TwinCAT OPC UA Server Path Traversal (CVE-2021-34594)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"TwinCAT OPC UA Server in TF6100 and TS6100 in product versions before 4.3.48.0 or with TcOpcUaServer versions below
3.2.0.194 are prone to a relative path traversal that allow administrators to create or delete any files on the system.
This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information.");
  script_set_attribute(attribute:"see_also", value:"https://cert.vde.com/en/advisories/VDE-2021-051/");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:C/A:C");
  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:H/UI:N/S:U/C:N/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-34594");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(22);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/11/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/11/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/02/07");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:beckhoff:tf6100_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:beckhoff:ts6100_firmware");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tenable.ot");

  script_copyright(english:"This script is Copyright (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("tenable_ot_api_integration.nasl");
  script_require_keys("Tenable.ot/Beckhoff");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Beckhoff');

var asset = tenable_ot::assets::get(vendor:'Beckhoff');

var vuln_cpes = {
    "cpe:/o:beckhoff:tf6100_firmware" :
        {"versionEndExcluding" : "4.3.48.0", "family" : "Beckhoff"},
    "cpe:/o:beckhoff:ts6100_firmware" :
        {"versionEndExcluding" : "4.3.48.0", "family" : "Beckhoff"}
};

tenable_ot::cve::compare_and_report(asset:asset, cpes:vuln_cpes, severity:SECURITY_HOLE);