ICS Advisory (ICSA-20-252-07)

Siemens Industrial Products

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1. EXECUTIVE SUMMARY

  • CVSS v3 5.5
  • ATTENTION: Low skill level to exploit
  • Vendor: Siemens
  • Equipment: Siemens Industrial Products containing certain processors
  • Vulnerability: Exposure of Sensitive Information to an Unauthorized Actor

2. RISK EVALUATION

Successful exploitation of this vulnerability may allow an authenticated user to enable information disclosure via local access.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

  • SIMATIC Field PG M4: All versions.
  • SIMATIC Field PG M5: All versions
  • SIMATIC Field PG M6: All versions
  • SIMATIC IPC3000 SMART: All versions
  • SIMATIC IPC347E: All versions
  • SIMATIC IPC427D (incl. SIPLUS variants): All versions
  • SIMATIC IPC427E (incl. SIPLUS variants): All versions
  • SIMATIC IPC477D: All versions
  • SIMATIC IPC477E: All versions
  • SIMATIC IPC477E Pro: All versions
  • SIMATIC IPC527G: All versions
  • SIMATIC IPC547E: All versions
  • SIMATIC IPC547G: All versions
  • SIMATIC IPC627D: All versions
  • SIMATIC IPC627E: All versions
  • SIMATIC IPC647D: All versions
  • SIMATIC IPC647E: All versions
  • SIMATIC IPC677D: All versions
  • SIMATIC IPC677E: All versions
  • SIMATIC IPC827D: All versions
  • SIMATIC IPC847D: All versions
  • SIMATIC IPC847E: All versions
  • SIMATIC ITP1000: All versions
  • SIMOTION P320-4E: All versions
  • SIMOTION P320-4S: All versions
  • SINUMERIK 828D (PPU.4 / PPU1740): All versions
  • SINUMERIK 840D sl (NCU730.3B): All versions
  • SINUMERIK ONE (NCU1750 / NCU1760): All versions

3.2 VULNERABILITY OVERVIEW

3.2.1    EXPOSURE OF SENSITIVE INFORMATION TO AN UNAUTHORIZED CWE-200

Incomplete cleanup from specific special register read operations in some Intel processors may allow an authenticated user to potentially enable information disclosure via local access.

CVE-2020-0543 has been assigned to this vulnerability. A CVSS v3 base score of 5.5 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N).

3.3 BACKGROUND

  • CRITICAL INFRASTRUCTURE SECTORS: Critical manufacturing
  • COUNTRIES/AREAS DEPLOYED: Worldwide
  • COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Alyssa Milburn, Hany Ragab, Kaveh Razavi, Herbert Bos, and Cristiano Giuffrida from the VUSec group at VU Amsterdam reported this vulnerability to Intel.

4. MITIGATIONS

Siemens is preparing updates and recommends the following specific workarounds and mitigations users can apply to reduce the risk until fixes are available.

  • As a prerequisite for an attack, an attacker must be able to run untrusted code on affected systems. Siemens recommends limiting the possibilities to run untrusted code if possible.
  • Applying a defense-in-depth concept can help to reduce the probability that untrusted code is run on the system. Siemens recommends applying the defense-in-depth concept.

As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens’ operational guidelines for Industrial Security, and following the recommendations in the product manuals.

Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/Industrialsecurity

For more information on these vulnerabilities and the associated mitigations, please see Siemens security advisory SSA-534763

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 us-cert.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 us-cert.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. This vulnerability is not exploitable from adjacent networks.


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://www.us-cert.gov/ics 
or incident reporting:  https://www.us-cert.gov/report

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