Unlike the Border Gateway Protocol (BGP) used by routers, TCP connections used with APC products are typically transient. This means that an attack would have to be performed while the product was being actively accessed by a user. Furthermore, TCP window sizes for APC applications are typically very small and make it more difficult for an attacker.
If available, deploy and use cryptographically secure protocols like SSL/TLS and SSH. These protocols prevent attackers from corrupting data and hijacking sessions. However, they do not prevent denial-of-service since authentication is performed above the transport layer (TCP).
To reduce the possibility of a denial-of-service condition it is recommended that APC products be protected by a firewall that can detect and respond to that class of attacks. In general, US-CERT recommends utilizing network security tactics such as Deploying and Use Cryptographically Secure Protocols, Ingress filtering, Network Isolation, and Egress filtering.
Status of this notice: INTERIM
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