Siemens SIMATIC NET CP343-1 Uncontrolled Resource Consumption (CVE-2020-25242)

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

include('compat.inc');

if (description)
{
  script_id(501100);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/04");

  script_cve_id("CVE-2020-25242");

  script_name(english:"Siemens SIMATIC NET CP343-1 Uncontrolled Resource Consumption (CVE-2020-25242)");

  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 NET CP 343-1 Advanced
(incl. SIPLUS variants) (All versions), SIMATIC NET CP 343-1 Lean
(incl. SIPLUS variants) (All versions), SIMATIC NET CP 343-1 Standard
(incl. SIPLUS variants) (All versions). Specially crafted packets sent
to TCP port 102 could cause a Denial-of-Service condition on the
affected devices. A cold restart might be necessary in order to
recover.

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/pdf/ssa-676775.pdf");
  script_set_attribute(attribute:"see_also", value:"https://us-cert.cisa.gov/ics/advisories/icsa-21-131-07");
  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 the risk:

- Limit access to TCP Port 102 on affected devices to specific IP addresses (e.g., with a firewall).

As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate
mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure the
environment according to Siemens operational guidelines for industrial security, and follow the recommendations in the
product manual.

Additional information on industrial security by Siemens can be found at: https://www.siemens.com/industrialsecurity

For more information about this issue, please see Siemens security advisory SSA-676775");
  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-2020-25242");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(400);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/05/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/05/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/05/02");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_net_cp_343-1_advanced_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_net_cp_343-1_lean_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_net_cp_343-1_standard_firmware");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2023-2024 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:simatic_net_cp_343-1_advanced_firmware" :
        {"family" : "S7300"},
    "cpe:/o:siemens:simatic_net_cp_343-1_lean_firmware" :
        {"family" : "S7300"},
    "cpe:/o:siemens:simatic_net_cp_343-1_standard_firmware" :
        {"family" : "S7300"}
};

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