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Rockwell Automation released new firmware to mitigate a resource exhaustion vulnerability in its PowerFlex 525 AC Drives, according to a report from NCCIC.

Successful exploitation of this vulnerability could result in resource exhaustion, denial of service, and/or memory corruption.

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An AC drive, PowerFlex 525 AC Drives with embedded EtherNet/IP and Safety Versions 5.001 and earlier suffer from the remotely exploitable vulnerability, discovered by Nicolas Merle of Applied Risk.

In the vulnerability, a remote, unauthenticated threat actor can repeatedly send specific CIP packets to an affected PowerFlex 525 drive, which may allow disruption of the availability of the device.

Cyber Security

CVE-2018-19282 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 7.5.

The product sees use mainly in the critical manufacturing sector. It also sees action on a global basis.

No known public exploits specifically target this vulnerability. However, an attacker with low skill level could leverage the vulnerability.

Rockwell Automation released new firmware to address the vulnerability. Click here to download the latest version of the firmware.

In addition, Rockwell Automation recommends the following general security guidelines:
• Utilize proper network infrastructure controls, such as firewalls, to help ensure CIP messages from unauthorized sources are blocked.
• 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 Port 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 (login required).
• If applicable, consult the product documentation for specific features, such as a hardware key-switch setting, which may be used to block unauthorized changes, etc.
• 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 or the business network.
• 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.

Rockwell Automation has released a security advisory regarding this vulnerability, which can be found on its website (login required).

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