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# SSA-223353: Multiple Vulnerabilities in Nucleus RTOS based SIMOTICS CONNECT 400

Publication Date:        2022-03-08
Last Update:             2022-03-08
Current Version:         1.0
CVSS v3.1 Base Score:    8.2

SUMMARY
=======

Multiple vulnerabilities (also known as "NUCLEUS:13") have been
identified in the Nucleus RTOS (real-time operating system), originally
reported in the Siemens Security Advisory SSA-044112:
https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf.

SIMOTICS CONNECT 400 devices are affected by some of the vulnerabilities
as documented below.

Siemens has released an update for the SIMOTICS CONNECT 400 and
recommends to update to the latest version.


AFFECTED PRODUCTS AND SOLUTION
==============================


* SIMOTICS CONNECT 400
  - Affected versions:
       All versions < V0.5.0.0
  - Remediation:
       Update to V0.5.0.0 or later version
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109778383/

* SIMOTICS CONNECT 400
  - Affected versions:
       All versions < V1.0.0.0
  - Affected by vulnerabilities:
    - CVE-2021-31344
    - CVE-2021-31346
    - CVE-2021-31890
  - Remediation:
       Update to V1.0.0.0 or later version
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109778383/


WORKAROUNDS AND MITIGATIONS
===========================


Siemens has not identified any additional specific workarounds or mitigations.
Please follow the "General Security Recommendations".

Product specific mitigations can be found in the section "Affected Products and Solution".

GENERAL SECURITY RECOMMENDATIONS
================================

As a general security measure Siemens strongly recommends to protect
network access to affected products with appropriate mechanisms. It is
advised to follow recommended security practices in order to run the
devices in a protected IT environment.

PRODUCT DESCRIPTION
===================

SIMOTICS CONNECT 400 is a connector and sensor box, mounted on
low-voltage motors to provide analytics data for the MindSphere
application SIDRIVE IQ Fleet.

VULNERABILITY CLASSIFICATION
============================

The vulnerability classification has been performed by using the CVSS scoring
system in version 3.1 (CVSS v3.1) (https://www.first.org/cvss/). The CVSS
environmental score is specific to the customer's environment and will impact
the overall CVSS score. The environmental score should therefore be
individually defined by the customer to accomplish final scoring.

An additional classification has been performed using the CWE classification, a
community-developed list of common software security weaknesses. This serves as
a common language and as a baseline for weakness identification, mitigation,
and prevention efforts. A detailed list of CWE classes can be found at:
https://cwe.mitre.org/.



* Vulnerability CVE-2021-31344

  ICMP echo packets with fake IP options allow sending ICMP echo reply
  messages to arbitrary hosts on the network. (FSMD-2021-0004)

  CVSS v3.1 Base Score: 5.3
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C
  CWE:                  CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')

* Vulnerability CVE-2021-31346

  The total length of an ICMP payload (set in the IP header) is unchecked.
  This may lead to various side effects, including Information Leak and
  Denial-of-Service conditions, depending on the network buffer
  organization in memory. (FSMD-2021-0007)

  CVSS v3.1 Base Score: 8.2
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H/E:P/RL:O/RC:C
  CWE:                  CWE-1284: Improper Validation of Specified Quantity in Input

* Vulnerability CVE-2021-31889

  Malformed TCP packets with a corrupted SACK option leads to Information
  Leaks and Denial-of-Service conditions. (FSMD-2021-0015)

  CVSS v3.1 Base Score: 7.5
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
  CWE:                  CWE-191: Integer Underflow (Wrap or Wraparound)

* Vulnerability CVE-2021-31890

  The total length of an TCP payload (set in the IP header) is unchecked.
  This may lead to various side effects, including Information Leak and
  Denial-of-Service conditions, depending on the network buffer
  organization in memory. (FSMD-2021-0017)

  CVSS v3.1 Base Score: 7.5
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
  CWE:                  CWE-240: Improper Handling of Inconsistent Structural Elements




ADDITIONAL INFORMATION
======================
Products listed in this advisory use the Nucleus RTOS (Real-time
operating system).

For more details regarding the vulnerabilities reported for Nucleus RTOS
refer to Siemens Security Advisory SSA-044112:
https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf

For further inquiries on security vulnerabilities in Siemens products and
solutions, please contact the Siemens ProductCERT:

https://www.siemens.com/cert/advisories


HISTORY DATA
============

V1.0 (2022-03-08): Publication Date

TERMS OF USE
============

Siemens Security Advisories are subject to the terms and conditions contained
in Siemens' underlying license terms or other applicable agreements previously
agreed to with Siemens (hereinafter "License Terms"). To the extent applicable
to information, software or documentation made available in or through a
Siemens Security Advisory, the Terms of Use of Siemens' Global Website
(https://www.siemens.com/terms_of_use, hereinafter "Terms of Use"), in
particular Sections 8-10 of the Terms of Use, shall apply additionally. In case
of conflicts, the License Terms shall prevail over the Terms of Use.
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