ICS Advisory (ICSA-22-258-03)

Siemens RUGGEDCOM ROS

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1. EXECUTIVE SUMMARY

  • CVSS v3 5.3
  • ATTENTION: Exploitable remotely/low attack complexity
  • Vendor: Siemens
  • Equipment: RUGGEDCOM ROS
  • Vulnerability: Uncontrolled Resource Consumption

2. RISK EVALUATION

Successful exploitation of this vulnerability could occupy all available HTTP connections and cause a denial-of-service condition.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

 The following versions of RUGGEDCOM ROS-based devices, typically switches and serial-to-Ethernet devices, are affected:

  • RUGGEDCOM ROS RMC8388: All versions prior to V5.6.0
  • RUGGEDCOM ROS RS416Pv2: All versions prior to V5.6.0
  • RUGGEDCOM ROS RS416v2: All versions prior to V5.6.0
  • RUGGEDCOM ROS RS900 (32M): All versions prior to V5.6.0
  • RUGGEDCOM ROS RS900G (32M): All versions prior to V5.6.0
  • RUGGEDCOM ROS RSG907R: All versions prior to V5.6.0
  • RUGGEDCOM ROS RSG908C: All versions prior to V5.6.0
  • RUGGEDCOM ROS RSG909R: All versions prior to V5.6.0
  • RUGGEDCOM ROS RSG910C: All versions prior to V5.6.0
  • RUGGEDCOM ROS RSG920P: All versions prior to V5.6.0
  • RUGGEDCOM ROS RSG2100 (32M): All versions prior to V5.6.0
  • RUGGEDCOM ROS RSG2288: All versions prior to V5.6.0
  • RUGGEDCOM ROS RSG2300: All versions prior to V5.6.0
  • RUGGEDCOM ROS RSG2300P: All versions prior to V5.6.0
  • RUGGEDCOM ROS RSG2488: All versions prior to V5.6.0
  • RUGGEDCOM ROS RSL910: All versions prior to V5.6.0
  • RUGGEDCOM ROS RST916C: All versions prior to V5.6.0
  • RUGGEDCOM ROS RST916P: All versions prior to V5.6.0
  • RUGGEDCOM ROS RST2228: All versions prior to V5.6.0
  • RUGGEDCOM ROS RST2228P: All versions prior to V5.6.0

3.2 VULNERABILITY OVERVIEW

3.2.1    UNCONTROLLED RESOURCE CONSUMPTION CWE-400

Affected devices improperly handle partial HTTP requests which makes them vulnerable to slowloris attacks. This could allow a remote attacker to create a denial-of-service condition that persists until the attack ends.

CVE-2022-39158 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

3.3 BACKGROUND

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

3.4 RESEARCHER

 Siemens reported this vulnerability to CISA.

4. MITIGATIONS

 Siemens has released updates for the following products:

As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To operate devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens’ Operational Guidelines for Industrial Security and following 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-459643 in HTML or CSAF.

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

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