ICS Advisory (ICSA-22-069-01)

Siemens RUGGEDCOM Devices (Update B)

Click to Tweet.
Click to send to Facebook.
Click to Share.

Legal Notice

All information products included in https://us-cert.cisa.gov/ics are provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/.


 

1. EXECUTIVE SUMMARY

--------- Begin Update B Part 1 of 5---------

  • CVSS v3 6.7
  • ATTENTION: Exploitable remotely/low attack complexity
  • Vendor: Siemens
  • Equipment: RUGGEDCOM Devices
  • Vulnerability: Inadequate Encryption Strength

--------- End Update B Part 1 of 5---------

    2. UPDATE INFORMATION

    This updated advisory is a follow-up to the original advisory titled ICSA-22-069-01 Siemens RUGGEDCOM Devices (Update A) that was published April 14, 2022, to the ICS webpage on cisa.gov/ics.

    3. RISK EVALUATION

    Successful exploitation of this vulnerability could allow an authorized threat actor to obtain privileges to access passwords.

    4. TECHNICAL DETAILS

    4.1 AFFECTED PRODUCTS

    The following versions of RUGGEDCOM, a software platform, are affected:

    --------- Begin Update B Part 2 of 5---------

    • RUGGEDCOM ROS i800: All versions
    • RUGGEDCOM ROS i801: All versions
    • RUGGEDCOM ROS i802: All versions
    • RUGGEDCOM ROS i803: All versions
    • RUGGEDCOM ROS M969: All versions
    • RUGGEDCOM ROS M2100: All versions
    • RUGGEDCOM ROS M2200: All versions
    • RUGGEDCOM ROS RMC: All versions
    • RUGGEDCOM ROS RMC20: All versions
    • RUGGEDCOM ROS RMC30: All versions
    • RUGGEDCOM ROS RMC40: All versions
    • RUGGEDCOM ROS RMC41: All versions
    • RUGGEDCOM ROS RMC8388: All versions
    • RUGGEDCOM ROS RP110: All versions
    • RUGGEDCOM ROS RS400: All versions
    • RUGGEDCOM ROS RS401: All versions
    • RUGGEDCOM ROS RS416: All versions
    • RUGGEDCOM ROS RS416v2: All versions
    • RUGGEDCOM ROS RS900 (32M): All versions
    • RUGGEDCOM ROS RS900G: All versions
    • RUGGEDCOM ROS RS900G (32M): All versions
    • RUGGEDCOM ROS RS900GP: All versions
    • RUGGEDCOM ROS RS900L: All versions
    • RUGGEDCOM ROS RS900L: All versions
    • RUGGEDCOM ROS RS900W: All versions
    • RUGGEDCOM ROS RS910: All versions
    • RUGGEDCOM ROS RS910L: All versions
    • RUGGEDCOM ROS RS910W: All versions
    • RUGGEDCOM ROS RS920L: All versions
    • RUGGEDCOM ROS RS920W: All versions
    • RUGGEDCOM ROS RS930L: All versions
    • RUGGEDCOM ROS RS930W: All versions
    • RUGGEDCOM ROS RS940G: All versions
    • RUGGEDCOM ROS RS969: All versions
    • RUGGEDCOM ROS RS8000: All versions
    • RUGGEDCOM ROS RS8000A: All versions
    • RUGGEDCOM ROS RS8000H: All versions
    • RUGGEDCOM ROS RS8000T: All versions
    • RUGGEDCOM ROS RSG900: All versions
    • RUGGEDCOM ROS RSG900C: All versions
    • RUGGEDCOM ROS RSG900G: All versions
    • RUGGEDCOM ROS RSG900R: All versions
    • RUGGEDCOM ROS RSG907R: All versions
    • RUGGEDCOM ROS RSG908C: All versions
    • RUGGEDCOM ROS RSG909R: All versions
    • RUGGEDCOM ROS RSG910C: All versions
    • RUGGEDCOM ROS RSG920P: All versions
    • RUGGEDCOM ROS RSG2100: All versions
    • RUGGEDCOM ROS RSG2100 (32M): All versions
    • RUGGEDCOM ROS RSG2100P: All versions
    • RUGGEDCOM ROS RSG2100P (32M): All versions
    • RUGGEDCOM ROS RSG2200: All versions
    • RUGGEDCOM ROS RSG2288: All versions
    • RUGGEDCOM ROS RSG2300: All versions
    • RUGGEDCOM ROS RSG2300P: All versions
    • RUGGEDCOM ROS RSG2488: All versions
    • RUGGEDCOM ROS RSL910: All versions
    • RUGGEDCOM ROS RST916C: All versions
    • RUGGEDCOM ROS RST916P: All versions
    • RUGGEDCOM ROS RST2228: All versions

    --------- End Update B Part 2 of 5---------

    4.2 VULNERABILITY OVERVIEW

    --------- Begin Update B Part 3 of 5---------

    4.2.1    INADEQUATE ENCRYPTION STRENGTH CWE-326

    The SSH server on affected devices is configured to offer weak ciphers by default. This could allow an unauthorized attacker in a man-in-the-middle position to read and modify any data passed over the connection between legitimate clients and the affected device.

    CVE-2021-37209 has been assigned to this vulnerability. A CVSS v3 base score of 6.7 has been calculated; the CVSS vector string is (AV:A/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:H).

    --------- End Update B Part 3 of 5---------

    4.3 BACKGROUND

    • CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors
    • COUNTRIES/AREAS DEPLOYED: Worldwide
    • COMPANY HEADQUARTERS LOCATION: Germany

    4.4 RESEARCHER

    Michael Messner from Siemens Energy reported this vulnerability to Siemens.

    5. MITIGATIONS

    --------- Begin Update B Part 4 of 5---------

    There is no current fix available for the specified products.

    --------- End Update B Part 4 of 5---------

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

    --------- Begin Update B Part 5 of 5---------

    • Configure the SSH clients to make use of the following strong key exchange ciphers, supported by the ROS SSH server:

    --------- End Update B Part 5 of 5---------

    • ecdh-sha2-nistp256
    • ecdh-sha2-nistp384
    • ecdh-sha2-nistp521
    • Add only the trusted SSH client public keys to ROS, and allow only those clients access

    As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring 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 on the Siemens industrial security webpage.

    For more information see Siemens Security Advisory SSA-764417

    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.


    Contact Information

    For any questions related to this report, please contact the CISA at:

    Email: CISAservicedesk@cisa.dhs.gov
    Toll Free: 1-888-282-0870

    For industrial control systems cybersecurity information:  https://us-cert.cisa.gov/ics 
    or incident reporting:  https://us-cert.cisa.gov/report

    CISA continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product.

    This product is provided subject to this Notification and this Privacy & Use policy.

    Please share your thoughts.

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