All information products included in https://us-cert.cisa.gov/ics are provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/.
1. EXECUTIVE SUMMARY
- CVSS v3 7.7
- ATTENTION: Exploitable remotely
- Vendor: Siemens
- Equipment: SINAMICS Medium Voltage Products
- Vulnerability: Missing Authentication for Critical Function
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to gain full remote access to the HMI.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Siemens reports this vulnerability affects the following SINAMICS products with telnet enabled on SIMATIC comfort HMI Panels:
- SINAMICS GH150: All versions
- SINAMICS GL150 (with option X30): All versions
- SINAMICS GM150 (with option X30): All versions
- SINAMICS SH150: All versions
- SINAMICS SL150: All versions
- SINAMICS SM120: All versions
- SINAMICS SM150: All versions
- SINAMICS SM150i: All versions
3.2 VULNERABILITY OVERVIEW
The Telnet service of the HMI Comfort Panels system component in affected SINAMICS products does not require authentication, which may allow a remote attacker to gain access to the device if the service is enabled. Telnet is disabled by default.
- CRITICAL INFRASTRUCTURE SECTORS: Chemical, Commercial Facilities, Critical Manufacturing, Energy, Food and Agriculture, Healthcare and Public Health, Transportation Systems, Water and Wastewater Systems
- COUNTRIES/AREAS DEPLOYED: Worldwide
- COMPANY HEADQUARTERS LOCATION: Germany
Siemens reported this vulnerability to CISA.
Only HMI image versions prior to v16 Update 3a are affected. Siemens recommends updating following products to v16 Update 4 or later:
- SINAMICS GH150
- SINAMICS GL150 (with option X30)
- SINAMICS GM150 (with option X30)
- SINAMICS SH150
- SINAMICS SM120
Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:
- Disable Telnet on the HMI Panels if enabled. If this is not possible, defense-in-depth should be used. Note: By default, Telnet is disabled.
- Follow SINAMICS MV industrial security guidelines
As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure the environment according to Siemens’ operational guidelines for industrial security, and follow the recommendations in the product manuals.
Additional information on industrial security by Siemens can be found at: https://www.siemens.com/industrialsecurity
For additional information see Siemens Security Advisory SSA-752103
For more details regarding the telnet authentication vulnerability in SIMATIC HMI Comfort Panels, refer to Siemens Security Advisory SSA-520004
CISA recommends 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 VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as its connected devices.
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.cisa.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.cisa.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.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product.
Please share your thoughts.
We recently updated our anonymous product survey; we'd welcome your feedback.