Rockwell Automation MicroLogix 1400 (Update A)

Risk Summary

Successful exploitation of this vulnerability may result in a denial-of-service condition.

CVEs (1)

Remediations

• All users, if applicable, may disable Modbus TCP support if it is not necessary for their MicroLogix 1400 implementation. Without Modbus TCP enabled, a potential attacker does not have access to exploit the device using this vulnerability.
• For additional information see Rockwell Automation Security Advisory PN1545.
• Utilize proper network infrastructure controls (such as firewalls) to help ensure Modbus TCP from unauthorized sources are blocked.
• Consult the product documentation for specific features (such as a hardware keyswitch setting), which may be used to block unauthorized changes, etc.
• Block all traffic to EtherNet/IP or other CIP protocol-based devices from outside the manufacturing zone by blocking or restricting access to TCP and UDP Port 2222 and 44818 using proper network infrastructure controls, such as firewalls, UTM devices, or other security appliances. For more information on TCP/UDP ports used by Rockwell Automation products, see Knowledgebase Article ID 898270.
• Run all software as a User, not as an Administrator, to minimize the impact of malicious code on the infected system.
• Use of Microsoft AppLocker or other similar allow list application can help mitigate risk. Information on using AppLocker with Rockwell Automation products is available at Knowledgebase Article ID 546989.
• Ensure the least-privilege user principle is followed, and user/service account access to shared resources (such as a database) is only granted with a minimum of rights as needed.
• Use trusted software, software patches, antivirus/antimalware programs, and interact only with trusted websites and attachments.
• Minimize network exposure for all control system devices and/or systems and ensure they are not accessible from the Internet. For further information about the risks of unprotected Internet accessible control systems, please see Knowledgebase Article ID 494865.
• Locate control system networks and devices behind firewalls and isolate them from the business network.
• When remote access is required, use secure methods, such as virtual private networks (VPNs), and recognize VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize a VPN is only as secure as the connected devices.

Affected Vendors

Affected Products (1)

Affected Sectors

Critical Manufacturing