ICS Advisory (ICSA-22-132-12)

Siemens Industrial Products

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1. EXECUTIVE SUMMARY

  • CVSS v3 7.5
  • ATTENTION: Exploitable remotely/low attack complexity
  • Vendor: Siemens
  • Equipment: OPC Foundation Local Discovery Server of several industrial products
  • Vulnerability: Improper Restriction of Operations within the Bounds of a Memory Buffer

2. RISK EVALUATION

Successful exploitation of this vulnerability could cause a denial-of-service condition on the service or the device.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Siemens reports this vulnerability affects the OPC Foundation Local Discovery Server of the following Siemens industrial products: 

  • SIMATIC NET PC Software v14: All versions prior to v14 SP1 Update 14
  • SIMATIC NET PC Software v15: All versions
  • SIMATIC NET PC Software v16: All versions
  • SIMATIC NET PC Software v17: All versions prior to v17 SP1
  • SIMATIC Process Historian OPC UA Server: All versions prior to 2020 SP1
  • SIMATIC WinCC: All versions
  • SIMATIC WinCC Runtime Professional: All versions
  • SIMATIC WinCC Unified Scada Runtime: All versions
  • TeleControl Server Basic v3: All versions

3.2 VULNERABILITY OVERVIEW

3.2.1    IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119

In OPC Foundation Local Discovery Server versions before 1.04.402.463, remote attackers can cause a denial-of-service condition by sending  targeted messages that lead to access of a memory location after the end of a buffer.

CVE-2021-40142 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

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 several affected products and recommends updating to the latest versions. Siemens is preparing further updates and recommends specific countermeasures for products where updates are not, or not yet, available.

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

  • Deactivate the OPC Local Discovery Server service if supported by the product use case. The local discovery server service is not activated in the default configuration.
  • Use a VPN for protecting network communication between cells.

As a general security measure, Siemens 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-321292

CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. 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/ics. 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/ics 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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