Siemens CP343-1 Devices Improper Verification of Source of a Communication Channel (CVE-2023-51440)

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

include('compat.inc');

if (description)
{
  script_id(502649);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/01");

  script_cve_id("CVE-2023-51440");
  script_xref(name:"ICSA", value:"24-046-04");

  script_name(english:"Siemens CP343-1 Devices Improper Verification of Source of a Communication Channel (CVE-2023-51440)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"A vulnerability has been identified in SIMATIC CP 343-1
(6GK7343-1EX30-0XE0) (All versions), SIMATIC CP 343-1 Lean
(6GK7343-1CX10-0XE0) (All versions), SIPLUS NET CP 343-1
(6AG1343-1EX30-7XE0) (All versions), SIPLUS NET CP 343-1 Lean
(6AG1343-1CX10-2XE0) (All versions). Affected products incorrectly
validate TCP sequence numbers. This could allow an unauthenticated
remote attacker to create a denial of service condition by injecting
spoofed TCP RST packets.

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-portal.siemens.com/productcert/html/ssa-516818.html");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-24-046-04");
  script_set_attribute(attribute:"solution", value:
"The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original
can be found at CISA.gov.

Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk:

- Apply network segmentation and defense-in-depth practices to reduce likelihood of a threat actor to be able to reach a
potentially vulnerable device.

As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To
operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens'
operational guidelines for industrial security and following recommendations in the product manuals.

Additional information on industrial security by Siemens can be found on the Siemens industrial security webpage.

For more information see the associated Siemens security advisory SSA-516818 in HTML and CSAF.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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:N/UI:N/S:U/C:N/I:N/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-2023-51440");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(940);

  script_set_attribute(attribute:"vuln_publication_date", value:"2024/02/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/02/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/10/21");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:cp_343-1_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:cp_343-1_lean_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:siplus_net_cp_343-1_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:siplus_net_cp_343-1_lean_firmware:-");
  script_set_attribute(attribute:"generated_plugin", value:"former");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2024-2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Siemens');

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

var vuln_cpes = {
    "cpe:/o:siemens:cp_343-1_firmware" :
        {"family" : "S7300", "orderNumbers": ["6GK7343-1EX30-0XE0"]},
    "cpe:/o:siemens:cp_343-1_lean_firmware:-" :
        {"family" : "S7300", "orderNumbers": ["6GK7343-1CX10-0XE0"]},
    "cpe:/o:siemens:siplus_net_cp_343-1_firmware:-" :
        {"family" : "S7300", "orderNumbers": ["6AG1343-1EX30-7XE0"]},
    "cpe:/o:siemens:siplus_net_cp_343-1_lean_firmware:-" :
        {"family" : "S7300", "orderNumbers": ["6AG1343-1CX10-2XE0"]}
};

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