Siemens LOGO! 8 BM Use of Hard-Coded Cryptographic Key (CVE-2020-25234)

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

include('compat.inc');

if (description)
{
  script_id(501680);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/09/04");

  script_cve_id("CVE-2020-25234");
  script_xref(name:"ICSA", value:"20-343-10");

  script_name(english:"Siemens LOGO! 8 BM Use of Hard-Coded Cryptographic Key (CVE-2020-25234)");

  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 LOGO! 8 BM (incl. SIPLUS
variants) (All versions < V8.3), LOGO! Soft Comfort (All versions <
V8.3). The LOGO! program files generated and used by the affected
components offer the possibility to save user-defined functions (UDF)
in a password protected way. This protection is implemented in the
software that displays the information. An attacker could reverse
engineer the UDFs directly from stored program files.

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-480824.pdf");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-20-343-10");
  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 released updates for the affected products and recommends users update to the latest versions:

- LOGO! 8 BM (incl. SIPLUS variants): Update to v8.3; A new hardware version is required in order to update
- LOGO! Soft Comfort: Update to v8.3

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

- Protect access to Port 10005/TCP
- Apply defense-in-depth concept, including protection concept outlined in the system manual.

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 to follow the recommendations in
the product manuals.

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

For more information, please see Siemens Security Advisory SSA-480824");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-2020-25234");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(321);

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/12/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/12/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/09/21");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:logo%21_8_bm_firmware");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  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:logo%21_8_bm_firmware" :
        {"versionEndExcluding" : "8.3", "family" : "LOGO!BM"}
};

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