  IoT context-sharing platforms are an essential component of today's
interconnected IoT deployments with their security affecting the entire
deployment and the critical infrastructure adopting IoT. We report on a lack of
systematic approach to the security of IoT context-sharing platforms and
propose the need for a methodological and systematic alternative to evaluate
the existing solutions and develop `secure-by-design' solutions. We have
identified the key components of a generic IoT context-sharing platform and
propose using MITRE ATT&CK for threat modelling of such platforms.
