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Rockwell Automation released an upgrade to mitigate a uncontrolled resource consumption vulnerability in its Stratix 5400/5410/5700, ArmorStratix 5700, according to a report with NCCIC.

Successful exploitation of this remotely exploitable vulnerability, witch Rockwell self-reported, could allow an unauthenticated remote attacker to cause a memory leak on an affected device, which may cause the device to reload.

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The following Stratix Industrial Switches are affected by this vulnerability in the Cisco Open Plug-n-Play agent:
• Allen-Bradley Stratix 5400: All versions prior to 15.2(6)E2a
• Allen-Bradley Stratix 5410: All versions prior to 15.2(6)E2a
• Allen-Bradley Stratix 5700: All versions prior to 15.2(6)E2a
• Allen-Bradley ArmorStratix 5700: All versions prior to 15.2(6)E2a

In the vulnerability, an unauthenticated remote attacker could send invalid data to the Cisco Network Plug and Play agent (also referred to as the Cisco Open Plug-n-Play agent) causing a memory leak on the device, which could cause the device to reload.

Cyber Security

CVE-2018-15377 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 6.8.

The products see use mainly in the critical manufacturing, energy, and water and wastewater systems sectors. They also see action on a global basis.

Rockwell automation recommends users upgrade to FRN 15.2(6)E2a or later.

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

Rockwell Automation recommends users apply the following general guidelines:
• Utilize proper network infrastructure controls, such as firewalls, to help ensure that requests from unauthorized sources are blocked and the controls are isolated from the business network.
• 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.
• Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet.
• 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.

For additional information, see Rockwell Automation’s security advisory (Login required).

Click here for Cisco’s product security disclosure.

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