Rockwell Mitigates Issue with PACs

Thursday, May 4, 2017 @ 02:05 PM gHale

Rockwell Automation released an update to mitigate a resource exhaustion vulnerability in its ControlLogix 5580 and CompactLogix 5380, according to a report with ICS-CERT.

Successful exploitation of this remotely exploitable vulnerability could cause the device the attacker is accessing to become unavailable.

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The following versions of ControlLogix 5580 and CompactLogix 5380, programmable automation controllers, suffer from the issue:
• ControlLogix 5580 controllers V28.011, V28.012, and V28.013
• ControlLogix 5580 controllers V29.011
• CompactLogix 5380 controllers V28.011
• CompactLogix 5380 controllers V29.011

No known public exploits specifically target this vulnerability. An attacker would need a high skill level to exploit the vulnerability.

The products see action in the critical manufacturing, food and agriculture, transportation systems, and water sectors. They see action on a global basis.

This vulnerability may allow an attacker to cause a denial of service condition by sending a series of specific CIP-based commands to the controller.

CVE-2017-6024 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 6.8.

Rockwell Automation recommends updating to the latest version of ControlLogix 5580 controllers, Version 30.011 or later.

Rockwell Automation recommends updating to the latest version of CompactLogix 5380 controllers, Version 30.011 or later.

For more information on this vulnerability and more detailed mitigation instructions, see Rockwell Automation’s advisory labeled ControlLogix 5580 and CompactLogix 5380 Programmable Automation Controller Denial of Service, Version 1.0, April 4.

There is additional information on Rockwell Automation’s security page.

ICS-CERT and Rockwell Automation recommend users take defensive measures to minimize the risk of exploitation of this vulnerability.

Specifically, users should:
• Block all traffic to EtherNet/IP or other CIP protocol-based devices from outside the Manufacturing Zone by blocking or restricting access to Port 2222/TCP and UDP and Port 44818/TCP and UDP 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.
• Minimize network exposure for all control system devices and/or systems, and help confirm that they are not accessible from the Internet.
• Locate control system networks and devices behind firewalls, and use best practices when isolating them from the business network. The Common Plant-wide Ethernet (CPwE) guide provides recommendations for deploying a plant-wide architecture: Industrial Firewalls within a CPwE Architecture
• 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. Also recognize that VPN is only as secure as the connected devices.

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