ICSA-23-227-01

Customers should immediately apply the following mitigations to reduce the risk of exploit:• Setup a VPN between the Modicon PLC controllers and the engineering workstation containing EcoStruxureTM Control Expert. Note: this functionality may be provided by an external IPSEC compatible firewall located close to the controller.• Harden the workstation running EcoStruxure™ Control Expert.

If customers choose not to apply the remediation then they are encouraged to immediately apply the following mitigations to reduce the risk of exploit: • Setup an application password in the project properties. • Setup network segmentation and implement a firewall to block all unauthorized access to port 502/TCP. • Configure the Access Control List following the recommendations of the user manuals: o “Modicon M340 for Ethernet Communications Modules and Processors User Manual” in chapter “Messaging Configuration Parameters”: https://www.se.com/ww/en/download/document/31007131K01000/ • Setup a secure communication according to the following guideline “Modicon Controllers Platform Cyber Security Reference Manual,” in chapter “Setup secured communications”: https://www.se.com/ww/en/download/document/EIO0000001999/ • Consider the use of external firewall devices such as EAGLE40-07 from Belden to establish VPN connections for M340 & M580 architectures. For more details refer to the chapter “How to protect M580 and M340 architectures with EAGLE40 using VPN”: https://www.se.com/ww/en/download/document/EIO0000001999/

If customers choose not to apply the remediation, it is recommended to apply the following mitigations to reduce the risk of the exploit:• Setup an application password in the project properties. • Setup network segmentation and implement a firewall to block all unauthorized access to port 502/TCP. • Configure the Access Control List following the recommendations of the user manuals: o “Modicon M580, Hardware, Reference Manual”: https://www.se.com/ww/en/download/document/EIO0000001578/ • Setup a secure communication according to the following guideline “Modicon Controllers Platform Cyber Security Reference Manual,” in chapter “Setup secured communications”: https://www.se.com/ww/en/download/document/EIO0000001999/ o use a BMENOC module and follow the instructions to configure IPSEC feature as described in the guideline “Modicon M580 - BMENOC03.1 Ethernet Communications Schneider Electric Security Notification Module, Installation and Configuration Guide” in the chapter “Configuring IPSEC communications”: https://www.se.com/ww/en/download/document/HRB62665/ OR • Use a BMENUA0100 module and follow the instructions to configure IPSEC feature as described in the chapter “Configuring the BMENUA0100 Cybersecurity Settings”: https://www.se.com/ww/en/download/document/PHA83350 OR • Consider use of external firewall devices such as EAGLE40-07 from Belden to establish VPN connections for M340 & M580 architectures. For more details refer to the chapter “How to protect M580 and M340 architectures with EAGLE40 using VPN”: https://www.se.com/ww/en/download/document/EIO0000001999/ • Ensure the M580 CPU is running with the memory protection activated by configuring the input bit to a physical input, for more details refer to the following guideline “Modicon Controllers Platform Cyber Security Reference Manual”, “CPU Memory Protection section”: https://www.schneiderelectric.com/en/download/document/EIO0000001999/ o NOTE: The CPU memory protection cannot be configured with M580 Hot Standby CPUs. In such cases, use IPsec encrypted communication.

If customers choose not to apply the remediation then they are encouraged to immediately apply the following mitigations to reduce the risk of exploit: • Setup an application password in the project properties. • Setup network segmentation and implement a firewall to block all unauthorized access to port 502/TCP. • Configure the Access Control List following the recommendations of the user manuals: o “Modicon M580, Hardware, Reference Manual”: https://www.se.com/ww/en/download/document/EIO0 000001578/ • Setup a secure communication according to the following guideline “Modicon Controllers Platform Cyber Security Reference Manual,” in chapter “Setup secured communications”: https://www.se.com/ww/en/download/document/EIO0000001 999/ o use a BMENOC module and follow the instructions to configure IPSEC feature as described in the guideline “Modicon M580 - BMENOC03.1 Ethernet Communications Schneider Electric Security Notification Module, Installation and Configuration Guide” in the chapter “Configuring IPSEC communications”: OR • Use a BMENUA0100 module and follow the instructions to configure IPSEC feature as described in the chapter “Configuring the BMENUA0100 Cybersecurity Settings”: https://www.se.com/ww/en/download/document/PHA83350 OR • Consider use of external firewall devices such as EAGLE40- 07 from Belden to establish VPN connections for M340 & M580 architectures. For more details refer to the chapter “How to protect M580 and M340 architectures with EAGLE40 using VPN”: https://www.se.com/ww/en/download/document/EIO0000001 999/ • Ensure the M580 CPU is running with the memory protection activated by configuring the input bit to a physical input, for more details refer to the following guideline “Modicon Controllers Platform Cyber Security Reference Manual”, “CPU Memory Protection section”: https://www.schneiderelectric.com/en/download/document/EIO0000001999/ o NOTE: The CPU memory protection cannot be configured with M580 Hot Standby CPUs. In such cases, use IPsec encrypted communication. To further reduce the attack surface on Modicon M580 CPU Safety: o Ensure the CPU is running in Safety mode and maintenance input is configured to maintain this Safety mode during operation – refer to the document Modicon M580 - Safety System Planning Guide - in the chapter “Operating Mode Transitions”: https://www.se.com/ww/en/download/document/QGH60283/

Schneider Electric is establishing a remediation plan for all future versions of Modicon MC80 controllers that will include a fix for this vulnerability. We will update this document when the remediation is available. Until then, customers should immediately apply the following mitigations to reduce the risk of exploit: • Setup an application password in the project properties • Setup network segmentation and implement a firewall to block all unauthorized access to port 502/TCP • Configure the Access Control List following the recommendations of the user manuals: • “Modicon MC80 Programmable Logic Controller (PLC) manual” in the chapter “Access Control List (ACL)”: https://www.se.com/ww/en/download/document/EIO0000002071/ • Setup a secure communication according to the following guideline “Modicon Controllers Platform Cyber Security Reference Manual,” in chapter “Setup secured communications”: https://www.se.com/ww/en/download/document/EIO0000001999/

If customers choose not to apply the remediation then they are encouraged to immediately apply the following mitigations to reduce the risk of exploit: • Setup an application password in the project properties • Setup network segmentation and implement a firewall to block all unauthorized access to port 502/TCP • Configure the Access Control List following the recommendations of the user manuals:• “Momentum for EcoStruxure™ Control Expert – 171 CBU 78090, 171 CBU 98090, 171 CBU 98091 Processors” manual in the chapter “Modbus Messaging and Access Control”: https://www.se.com/ww/en/download/document/HRB44124/ • Setup a secure communication according to the following guideline “Modicon Controllers Platform Cyber Security Reference Manual,” in chapter “Setup secured communications”: https://www.se.com/ww/en/download/document/EIO0000001999/

EcoStruxure™ Control Expert V16.2 HF003 includes a fix for this vulnerability and is available for download here: https://www.se.com/ww/en/product-range/548-ecostruxure-control-expert-unity-pro/#software-and-firmware

Version 3.70 of Modicon M340 includes a fix for this vulnerability and is available for download here: https://www.se.com/ww/en/product-range/1468-modicon-m340/#software-and-firmware

Firmware SV4.20 includes a fix for this vulnerability and is available for download here:https://www.se.com/ww/en/product-range/62098-modicon-m580-epac/#software-and-firmware

Firmware SV4.21 includes a fix for this vulnerability and is available for download here:https://www.se.com/ww/en/product-range/62098-modicon-m580-pac-controller/#software-and-firmware Important: customer needs to use the version of EcoStruxure™ Control Expert v16.0 HF001 minimum to connect with the latest version of M580 CPU Safety. The software is available for download here: https://www.se.com/ww/en/product-range/548-ecostruxure-control-expert-unity-pro/#software-and-firmware

Firmware SV2.90 includes a fix for this vulnerability and is available for download here:https://www.se.com/ww/en/product-range/535-modicon-momentum/?parent-category-id=3900&parent-subcategory-id=3930&filter=business-1-industrial-automation-and-control#products