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. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.Īdditional mitigation guidance and recommended practices are publicly available on the ICS webpage on in the Technical Information Paper, ICS-TIP-12-146-01B-Targeted Cyber Intrusion Detection and Mitigation Strategies. Also recognize that VPN is only as secure as the connected devices.ĬISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.ĬISA also provides a section for control systems security recommended practices on the ICS webpage on. 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.Locate control system networks and remote devices behind firewalls, and isolate them from the business network.Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet.Siemens also advises that users configure the operational environment according to Siemens’ Operational Guidelines for Industrial Security.įor more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens Security Advisory SSA-731239.ĬISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Siemens strongly recommends users protect network access with appropriate mechanisms (e.g., firewalls, segmentation, VPN). to communicate with ES/OS in order to mitigate vulnerability 2 (CVE-2016-9159). For SIMATIC S7-CPU 410 CPUs: Activate Field Interface Security in PCS 7 V9.0 and use a CP 443-1 Adv.Use VPN for protecting network communication between cells.Apply Protection-Level 3 read/write protection.Siemens also recommends the following mitigations:
SIEMENS SIMATIC S7 300 PLC UPDATE
SIMATIC S7-410 v8 CPU family: Update to v8.2.SIMATIC S7-400 v7 CPU family: Update to v7.0.2.SIMATIC S7-300 CPU family: Update to v3.X.14.Siemens provides the following firmware versions to resolve CVE-2016-9158: Zhu WenZhe from Beijing Acorn Network Technology reported these vulnerabilities to CISA. CRITICAL INFRASTRUCTURE SECTORS: Chemical, Energy, Food and Agriculture, and Water and Wastewater Systems.End Update E Part 1 of 1 - 4.3 BACKGROUND A CVSS v3 base score of 7.5 has been assigned the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N). A cold restart is required to recover the system.ĬVE-2016-9158 has been assigned to this vulnerability. Specially crafted packets sent to Port 80/TCP could cause the affected devices to go into defect mode. SIPLUS variants) all versions (only affected by CVE-2016-9159)Ĥ.2 VULNERABILITY OVERVIEW 4.2.1 INFORMATION EXPOSURE CWE-200Īn attacker with network access to Port 102/TCP (ISO-TSAP) or via Profibus could obtain credentials from the PLC if Protection-Level 2 is configured on the affected devices.ĬVE-2016-9159 has been assigned to this vulnerability. SIMATIC S7-400 PN/DP V7 CPU family (incl.SIMATIC S7-400 PN/DP V6 and below CPU family (incl.related ET200 CPUs and SIPLUS variants) all versions Successful exploitation of these vulnerabilities could lead to a denial-of-service condition or result in credential disclosure. This updated advisory is a follow-up to the advisory update titled ICSA-16-348-05 SIEMENS S7-300/400 PLC Vulnerabilities (Update D) that was published January 25, 2018, to the ICS webpage on. Vulnerabilities: Information Exposure, Improper Input Validation.Equipment: SIMATIC S7-300 and SIMATIC S7-400.ATTENTION: Exploitable remotely/low skill level to exploit.