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Advisory (ICSA-18-128-01)

Siemens Medium Voltage SINAMICS Products

Original release date: May 08, 2018 | Last revised: May 10, 2018

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1. EXECUTIVE SUMMARY

  • CVSS v3 7.5
  • ATTENTION: Exploitable remotely/low skill level to exploit
  • Vendor: Siemens
  • Equipment: Medium Voltage SINAMICS Products
  • Vulnerabilities: Improper Input Validation

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could result in a denial-of-service condition, resulting in a manual restart of the affected devices.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Siemens reports that these vulnerabilities affect the following products:

  • SINAMICS GH150 V4.7 w. PROFINET: All versions prior to V4.7 SP5 HF7,
  • SINAMICS GL150 V4.7 w. PROFINET: All versions prior to V4.8 SP2,
  • SINAMICS GM150 V4.7 w. PROFINET: All versions prior to V4.8 SP2,
  • SINAMICS SL150 V4.7.0 w. PROFINET: All versions prior to V4.7 HF30,
  • SINAMICS SL150 V4.7.4 w. PROFINET: All versions prior to V4.8 SP2,
  • SINAMICS SL150 V4.7.5 w. PROFINET: All versions prior to V4.8 SP2,
  • SINAMICS SM120 V4.7 w. PROFINET: All versions prior to V4.8 SP2, and
  • SINAMICS SM150 V4.7 w. SIMOTION and PROFINET: All versions.

3.2 VULNERABILITY OVERVIEW

3.2.1   IMPROPER INPUT VALIDATION CWE-20

Specially crafted packets sent to Port 161/UDP could cause a denial-of-service condition. The affected devices must be restarted manually.

CVE-2017-12741 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).

3.2.2   IMPROPER INPUT VALIDATION CWE-20

Specially crafted PROFINET DCP broadcast packets could cause a denial-of-service condition of affected products on a local Ethernet segment (Layer 2). Human interaction is required to recover the systems. PROFIBUS interfaces are not affected.

CVE-2017-2680 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

3.3 BACKGROUND

  • Critical Infrastructure Sectors: Chemical, Critical Manufacturing, Energy, Food and Agriculture, Water and Wastewater Systems
  • Countries/Areas Deployed: Worldwide
  • Company Headquarters Location: Germany

3.4 RESEARCHER

Siemens ProductCERT reported these vulnerabilities to NCCIC.

4. MITIGATIONS

Siemens recommends users implement the following updates. These updates can be obtained from a Siemens representative or via Siemens customer service.

  • SINAMICS GH150 V4.7 w. PROFINET: Update to V4.7 SP5 HF7 or upgrade to V4.8 SP2,
  • SINAMICS GL150 V4.7 w. PROFINET: Upgrade to V4.8 SP2,
  • SINAMICS GM150 V4.7 w. PROFINET: Upgrade to V4.8 SP2,
  • SINAMICS SL150 V4.7.0 w. PROFINET: Update to V4.7 HF30 or upgrade to V4.8 SP2,
  • SINAMICS SL150 V4.7.4 w. PROFINET: Upgrade to V4.8 SP2,
  • SINAMICS SL150 V4.7.5 w. PROFINET: Upgrade to V4.8 SP2, and
  • SINAMICS SM120 V4.7 w. PROFINET: Upgrade to V4.8 SP2

Siemens has identified the following specific workarounds and mitigations users can apply for SINAMICS SM150 V4.7 w. SIMOTION and PROFINET: All versions, to reduce the risk:

  • Apply cell protection concept and implement Defense-in-Depth.
  • Protect network access to Port 161/UDP of affected devices.
  • Use VPN for protecting network communication between cells.

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 (Download: https://www.siemens.com/cert/operational-guidelines-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 associated mitigation practices, please see Siemens security advisory SSA-546832 on their website:

https://www.siemens.com/cert/advisories

NCCIC recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:

  • Minimize network exposure for all control system devices and/or systems, and ensure that 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 that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices.

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

NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. 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-CERT website 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 NCCIC for tracking and correlation against other incidents.

No known public exploits specifically target these vulnerabilities.


Contact Information

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

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  http://ics-cert.us-cert.gov 
or incident reporting:  https://ics-cert.us-cert.gov/Report-Incident?

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