Weidmueller: Remote I/O fieldbus couplers (IP20) affected by INFRA:HALT vulnerabilities

The Weidmueller Remote I/O (IP20) fieldbus couplers (u-remote) are affected by several vulnerabilities of the third-party TCP/IP Niche stack. An attacker may use crafted IP packets to cause a denial of service or breach of integrity of the affected products. Weidmueller recommends restricting network access from the internet and also locally to reduce the attack vector to a manageable minimum.

Fieldbuses (including Industrial Ethernet protocols) in general are not intended for direct connection with the internet, as they lack a proper set of security capabilities. This also applies to Weidmüller IP20 Remote I/O fieldbus couplers, which are developed and designed for operation in closed industrial networks.

• Do not directly connect the affected products to the internet.
• Restrict network access to the affected products by proper secured network infrastructure (e.g. routers, firewalls, DMZ, VPNs).
• Restrict physical access to the industrial network and affected products (e.g cabinets, seals, closures).