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ICS Advisory


SIEMENS SCALANCE X SWITCHES (UPDATE D)

Last Revised
February 10, 2022
Alert Code
ICSA-19-225-03



1. EXECUTIVE SUMMARY

 * CVSS v3 8.6
 * ATTENTION: Exploitable remotely/low attack complexity
 * Vendor: Siemens
 * Equipment: SCALANCE X switches
 * Vulnerability: Insufficient Resource Pool


2. UPDATE INFORMATION

This updated advisory is a follow-up to the advisory update titled
ICSA-19-225-03 Siemens SCALANCE X Switches (Update C) that was published
September 14, 2021, to the ICS webpage on www.cisa.gov/uscert.


3. RISK EVALUATION

Successful exploitation of this vulnerability could cause a denial-of-service
condition.


4. TECHNICAL DETAILS


4.1 AFFECTED PRODUCTS

The following versions of SCALANCE X switches are affected:

--------- Begin Update D Part 1 of 1 ---------

 * SCALANCE X204RNA (HSR) (6GK5204-0BA00-2MB2): All versions
 * SCALANCE X204RNA (PRP) (6GK5204-0BA00-2KB2): All versions
 * SCALANCE X204RNA EEC (HSR) (6GK5204-0BS00-2NA3): All versions
 * SCALANCE X204RNA EEC (PRP) (6GK5204-0BS00-3LA3): All versions
 * SCALANCE X204RNA EEC (PRP/HSR) (6GK5204-0BS00-3PA3): All versions

--------- End Update D Part 1 of 1 ---------

 * SCALANCE X-200IRT switch family (incl. SIPLUS NET variants): All versions
   prior to 5.5.0
 * SCALANCE X-200RNA: All versions


4.2 VULNERABILITY OVERVIEW

4.2.1    INSUFFICIENT RESOURCE POOL CWE-410(LINK IS EXTERNAL)

An attacker may send large message packages repeatedly to the telnet service,
which may allow a denial-of-service condition.

CVE-2019-10942 has been assigned to this vulnerability. A CVSS v3 base score of
8.6 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H(link is external)).


4.3 BACKGROUND

 * CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy,
   Food and Agriculture, and Water and Wastewater Systems
 * COUNTRIES/AREAS DEPLOYED: Worldwide
 * COMPANY HEADQUARTERS LOCATION: Germany


4.4 RESEARCHER

Younes Dragoni and Alessandro Di Pinto from Nozomi Networks and Artem Zinenko
from Kaspersky reported these vulnerability details to Siemens.


5. MITIGATIONS

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

 * SCALANCE X-200 switch family (incl. SIPLUS NET variants): Update to v5.2.5 or
   later(link is external)
 * SCALANCE X-200IRT switch family (incl. SIPLUS NET variants): Update to v5.5.0
   or later(link is external)
 * Disable telnet service on affected devices. Users should use SSH instead.
 * Restrict network access to Port 23/TCP of the device.

Siemens recommends users configure their environment according to Siemens’
operational guidelines for industrial security(link is external) and follow the
recommendations in the product manuals.

Additional information on industrial security by Siemens can be found at:

https://www.siemens.com/industrialsecurity(link is external)

For more information on the vulnerability and more detailed mitigation
instructions, please see Siemens security advisory SSA-100232(link is external)

CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:

 * Minimize network exposure for all control system devices and/or systems, and
   ensure they are not accessible from the Internet.
 * Locate control system networks and remote devices behind firewalls and
   isolate them from the business network.
 * When remote access is required, use secure methods, such as Virtual Private
   Networks (VPNs), recognizing VPNs may have vulnerabilities and should be
   updated to the most current version available. Also recognize VPN is only as
   secure as its connected devices.

CISA reminds organizations to perform proper impact analysis and risk assessment
prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices
on the ICS webpage on cisa.gov. Several recommended practices are available for
reading and download, including Improving Industrial Control Systems
Cybersecurity with Defense-in-Depth Strategies.

Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on cisa.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies.

Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.

No known public exploits specifically target this vulnerability.


VENDOR

Siemens


PLEASE SHARE YOUR THOUGHTS

We recently updated our anonymous product survey; we’d welcome your feedback.


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May 25, 2023
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