Siemens LOGO! CMR and SIMATIC RTU 3000 Use of Insufficiently Random Values (CVE-2021-37186)

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

include('compat.inc');

if (description)
{
  script_id(501666);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/09/04");

  script_cve_id("CVE-2021-37186");
  script_xref(name:"ICSA", value:"21-257-13");

  script_name(english:"Siemens LOGO! CMR and SIMATIC RTU 3000 Use of Insufficiently Random Values (CVE-2021-37186)");

  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! CMR2020 (All versions <
V2.2), LOGO! CMR2040 (All versions < V2.2), SIMATIC RTU3010C (All
versions < V4.0.9), SIMATIC RTU3030C (All versions < V4.0.9), SIMATIC
RTU3031C (All versions < V4.0.9), SIMATIC RTU3041C (All versions <
V4.0.9). The underlying TCP/IP stack does not properly calculate the
random numbers used as ISN (Initial Sequence Numbers). An adjacent
attacker with network access to the LAN interface could interfere with
traffic, spoof the connection and gain access to sensitive
information.

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-316383.pdf");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-21-257-13");
  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:

- LOGO! CMR2020 and CMR2040: Update to v2.2 or later version

- SIMATIC RTU 3000 family: Update to v4.0.9 or later version

As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate
mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the
environment according to Siemens’ operational guidelines for industrial security and following 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 about this issue, please see Siemens Security Advisory SSA-316383");
  script_set_cvss_base_vector("CVSS2#AV:A/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:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/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-2021-37186");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(330);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/09/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/09/14");
  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_cmr2020_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:logo%21_cmr2040_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_cmr2020_firmware" :
        {"versionEndExcluding" : "2.2", "family" : "LOGO!CM"},
    "cpe:/o:siemens:logo%21_cmr2040_firmware" :
        {"versionEndExcluding" : "2.2", "family" : "LOGO!CM"}
};

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