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Software defined networking implements the network control plane in anexternal entity, rather than in each individual device as in conventionalnetworks. This architectural difference implies a different design for controlfunctions necessary for essential network properties, e.g., loop prevention andlink redundancy. We explore how such differences redefine the securityweaknesses in the SDN control plane and provide a framework for comparativeanalysis which focuses on essential network properties required by typicalproduction networks. This enables analysis of how these properties aredelivered by the control planes of SDN and conventional networks, and tocompare security risks and mitigations. Despite the architectural difference,we find similar, but not identical, exposures in control plane security if bothnetwork paradigms provide the same network properties and are analyzed underthe same threat model. However, defenses vary; SDN cannot depend on edge basedfiltering to protect its control plane, while this is arguably the primarydefense in conventional networks. Our concrete security analysis suggests thata distributed SDN architecture that supports fault tolerance and consistencychecks is important for SDN control plane security. Our analysis methodologymay be of independent interest for future security analysis of SDN andconventional networks.

A Framework and Comparative Analysis of Control Plane Security of SDN and Conventional Networks