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Advisory (ICSA-17-061-03)

Siemens SINUMERIK Integrate and SINUMERIK Operate

Original release date: March 02, 2017

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CVSS v3 7.4

ATTENTION: Remotely exploitable.

Vendor: Siemens

Equipment: SINUMERIK Integrate, SINUMERIK Operate

Vulnerability: Man-in-the-Middle

AFFECTED PRODUCTS

Siemens reports that the vulnerability affects the following SINUMERIK Integrate and Operate product suite versions:

  • SINUMERIK Integrate Access MyMachine/Ethernet with
    • AMM Service Engineer Client (ActiveX): All versions.
  • SINUMERIK Integrate Access MyMachine/Ethernet and Analyze MyCondition with
    • SINUMERIK Integrate Operate Client:
      • All versions between 2.0.3.00.016 (including) and 2.0.6 (excluding), and
      • All versions between 3.0.4.00.032 (including) and 3.0.6 (excluding).
    • Affected SINUMERIK Integrate Operate clients are included in the following Operate releases:
      • All versions between V4.5 SP6 (including) and V4.5 SP6 Hotfix 8 (excluding), and
      • All versions between V4.7 SP2 Hotfix 1 (including) and V4.7 SP4 (excluding).

IMPACT

Successful exploitation of this vulnerability could allow attackers in a privileged network position to capture and modify network traffic protected with transport layer security.

MITIGATION

Siemens provides the following updates for affected SINUMERIK Integrate and SINUMERIK Operate versions:

  • SINUMERIK Integrate Access MyMachine/Ethernet and Analyze MyCondition with
    • SINUMERIK Operate V4.7:
      • Update to SINUMERIK Operate V4.7 SP4, or
      • Update SINUMERIK Integrate Operate Client to V3.0.6
    • SINUMERIK Operate V4.5:
      • Update to SINUMERIK Operate V4.5 SP6 Hotfix 8, or
      • Update SINUMERIK Integrate Operate Client to V2.0.6
  • SINUMERIK Integrate Access MyMachine/Ethernet with
    • AMM Service Engineer (ActiveX):
      • Replace with AMM Service Client V4.1.0.5
      • Replacement will be automatically installed when connecting to SINUMERIK Integrate V4.1 SP5 or newer.

These updates can be obtained from a local Siemens service organization. If assistance is needed in identifying a local Siemens service organization, users may contact a local Siemens hotline at the following link:

https://w3.siemens.com/aspa_app/

As a general security measure Siemens strongly recommends users configure their environment according to Siemens operational guidelines found below:

https://www.industry.siemens.com/topics/global/en/industrial-security/Documents/operational_guidelines_industrial_security_en.pdf

For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-934525 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. High skill level is needed to exploit.

VULNERABILITY OVERVIEW

A channel accessible by non-endpoint (‘man-in-the-middle’) vulnerability has been identified. This could allow an unverified attacker to eavesdrop, capture, or modify communications.

CVE-2017-2685 has been assigned to this vulnerability. A CVSS v3 base score of 7.4 has been assigned; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N).

BACKGROUND

Critical Infrastructure Sector(s): Energy, Healthcare and Public Health, and Transportation Systems

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Germany


Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900

For industrial control systems security information and incident reporting: http://ics-cert.us-cert.gov

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