ATTENTION: Remotely exploitable/low skill level to exploit.
Equipment: SIPROTEC 4 and SIPROTEC Compact
Vulnerabilities: Improper Input Validation, Missing Authorization, Improper Authentication
This updated advisory is a follow-up to the updated advisory titled ICSA-17-187-03A Siemens SIPROTEC 4 and SIPROTEC Compact that was published July 18, 2017, on the NCCIC/ICS-CERT web site.
Siemens reports that the vulnerabilities affect the following SIPROTEC 4 and SIPROTEC Compact protection, control, measurement, and automation devices:
--------- Begin Update B Part 1 of 2 --------
--------- End Update B Part 1 of 2 ----------
Successful exploitation of these vulnerabilities could cause a denial-of-service condition, allow an attacker access to sensitive information, or allow an attacker to perform administrative functions.
--------- Begin Update B Part 2 of 2 --------
Siemens provides updates for the following affected products and recommends users update to the latest version:
--------- End Update B Part 2 of 2 ----------
Siemens is preparing updates for the remaining affected products and recommends the following mitigations in the meantime:
Please see the specific product manual for more information. Manuals can be obtained from the downloads menu at the following Siemens web site:
Siemens recommends users protect network access with appropriate mechanisms such as firewalls, segmentation, and VPNs. Siemens also advises that users configure the operational environment according to Siemens’ Operational Guidelines for Industrial Security:
For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-323211 at the following location:
ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
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.
In addition, ICS-CERT recommends that users take the following measures to protect themselves from social engineering attacks:
No known public exploits specifically target these vulnerabilities.
Specially crafted packets sent to Port 50000/UDP could cause a denial of service of the affected device. A manual reboot may be required to recover the service of the device.
The integrated web server (Port 80/TCP) of the affected devices could allow remote attackers to obtain sensitive device information if network access was obtained.
The integrated web server (Port 80/TCP) of the affected devices could allow remote attackers to obtain a limited amount of device memory content if network access was obtained.
Attackers with network access to the device’s web interface (Port 80/TCP) could circumvent authentication and perform certain administrative operations.
Specially crafted packets sent to Port 80/TCP could cause the affected device to go into defect mode.
Attackers with network access to the device’s web interface (Port 80/TCP) could circumvent authentication and perform certain administrative operations. A legitimate user must be logged into the web interface for the attack to be successful.
Siemens reported these vulnerabilities to ICS-CERT when they made firmware available to fix them.
Critical Infrastructure Sector: Energy
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany