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U.S. Department of Homeland Security Seal. ICS-CERT. Industrial Control Systems Cyber Emergency Response Team.
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Advisory (ICSA-18-023-02)

Siemens Industrial Products

Original release date: January 23, 2018

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CVSS v3 6.5

ATTENTION: Remotely exploitable/low skill level to exploit.

Vendor: Siemens

Equipment: Industrial Products

Vulnerability: Improper Input Validation

AFFECTED PRODUCTS

Siemens reports that this vulnerability affects the following products using PROFINET DCP:

  • SIMATIC CP 1242-7 GPRS V2: All versions prior to V2.1.82,
  • SIMATIC CP 1243-7 LTE EU/US: All versions prior to V2.1.82,
  • SIMATIC CP 1243-8: All versions prior to V2.1.82,
  • SIMATIC CP 1626: All versions,
  • Extension Unit 12” PROFINET: All versions prior to V01.01.01,
  • Extension Unit 15” PROFINET: All versions prior to V01.01.01,
  • Extension Unit 19” PROFINET: All versions prior to V01.01.01, and
  • Extension Unit 22” PROFINET: All versions prior to V01.01.01

IMPACT

Successful exploitation of this vulnerability could cause the targeted device to enter a denial-of-service condition, which may require human interaction to recover the system.

MITIGATION

The attacker must have network access to the local Ethernet segment (Layer 2).

As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to run the devices in a protected IT environment, Siemens particularly recommends to configure the environment according to Siemens’ Operational Guidelines for Industrial Security and to follow the recommendations in the product manuals. The Operational Guidelines for Industrial Security can be found at:

https://www.siemens.com/cert/operational-guidelines-industrial-security

Additional information on Industrial Security by Siemens can be found at: 

https://www.siemens.com/global/en/home/company/topic-areas/future-of-manufacturing/industrial-security.html

Siemens provides firmware updates to address the vulnerability for the following affected products and recommends users update to the new fixed version:

  • Extension Unit 12” PROFINET: Update to V01.01.01
  • Extension Unit 15” PROFINET: Update to V01.01.01
  • Extension Unit 19” PROFINET: Update to V01.01.01
  • Extension Unit 22” PROFINET: Update to V01.01.01

https://support.industry.siemens.com/cs/document/109750351

  • SIMATIC CP 1242-7 GPRS V2: Update to V2.1.82
  • SIMATIC CP 1243-7 LTE EU/US: Update to V2.1.82
  • SIMATIC CP 1243-8 IRC: Update to V2.1.82

https://support.industry.siemens.com/cs/ww/en/view/109749515

  • SIMATIC CP 1626: All versions

Siemens has released updates for several affected products, is working on updates for the remaining affected products, and recommends specific countermeasures until fixes are available.

  • Apply cell protection concept
  • Use VPN for protecting network communication between cells
  • Apply Defense-in-Depth

For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-284673 at the following location:

http://www.siemens.com/cert/en/cert-security-advisories.htm

NCCIC/ICS-CERT recommends that 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 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.

ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

ICS-CERT 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 in the ICS‑CERT Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site.

Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents.

No known public exploits specifically target this vulnerability.

VULNERABILITY OVERVIEW

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).

RESEARCHER

Siemens reported this vulnerability to ICS-CERT.

BACKGROUND

Critical Infrastructure Sectors: Chemical, Critical Manufacturing, Energy, Food and Agriculture, Water and Wastewater Systems

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Germany


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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