Schneider Electric Modicon Modbus Protocol

Risk Summary

ATTENTION: Remotely exploitable/low skill level to exploit.

CVEs (2)

Remediations

• Schneider Electric has reported that they have introduced compensating controls to limit the exploitability of the identified vulnerabilities in many of the PLCs in the Modicon family; however, Schneider Electric recommends that users apply security measures to improve resiliency.
• Schneider Electric's Momentum M1E controllers (all versions of model 171CBU98090 and all versions of model 171CBU98091) do not have built-in compensating controls to limit the exploitability of the identified vulnerabilities
• Protect access to M1E controllers by a firewall blocking all remote/external access to Port 502.
• Enable protection based on an authentication to connect to PLC. This method relies on a feature named Application Password. Once enabled, password-based authentication is required whenever a user connects to change their application program
• Enable protection relying on an input (M340, Premium, Quantum) or a key switch in the front panel (Quantum) to reject remote connection or run/stop commands
• Enable the “Access Control List protection,” where users are able to configure the restricted IP addresses that are pre-authorized to control the PLC.
• For additional information, Schneider Electric has released a Cybersecurity Notification

Affected Vendors

Affected Products (1)

Affected Sectors

Critical Manufacturing, Dams, Defense Industrial Base, Energy, Food and Agriculture, Government Facilities, Nuclear Reactors, Materials, and Waste, Transportation Systems, and Water and Wastewater Systems