PHOENIX CONTACT: Products utilizing WIBU SYSTEMS CodeMeter components in versions prior to V7.21a

Impact
An attacker may use the above-described vulnerabilities to perform a Denial of Service attack.
Phoenix Contact devices using CodeMeter embedded are not affected by these vulnerabilities.

Mitigation
1. Use general security best practices to protect systems from local and network attacks like described in the application node AH EN INDUSTRIAL SECURITY external link.
2. Run CodeMeter as client only and use localhost as binding for the CodeMeter communication. With binding to localhost an attack is no longer possible via remote network connection. The network server is disabled by default. If it is not possible to disable the network server, using a host-based firewall to restrict access to the CmLAN port can reduce the risk.
3. The CmWAN server is disabled by default. Please check if CmWAN is enabled and disable the feature if it is not needed.
4. Run the CmWAN server only behind a reverse proxy with user authentication to prevent attacks from unauthenticated users. The risk of an unauthenticated attacker can be further reduced by using a host-based firewall that only allows the reverse proxy to access the CmWAN port.

Remediation
PHOENIX CONTACT strongly recommends affected Users to upgrade to Codemeter V7.21a, which fixes these vulnerabilities. Wibu-Systems has already published this update for CodeMeter on their homepage. Since this current version of CodeMeter V7.21a has not yet been incorporated into Phoenix Contact products, we strongly recommend to download and install the current CodeMeter version directly from the Wibu-Systems homepage.