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Software components for on-board architectures in the space domain areincreasingly reliant on Commercial Off-The-Shelf (COTS), Open Source (OSS) orother third party software products. However, these software components oftenhave not been built with mission critical requirements in mind. Developmentproject teams incorporating these products have limited knowledge of or controlover the processes applied during the design, implementation, testing andmaintenance of selected COTS/OSS software products. These constraints generateuncertainty of potential software induced failures. Moreover, the lack ofinformation regarding security vulnerabilities increases the risks of theirusage, since their exploitation might lead to undesired behaviour of thesoftware and therefore to a system failure. The purpose of this paper is topresent a combined approach that takes into account reliability and securityenhancements for third party software, based on Time-Space Partitioning andMultiple Levels of Security.

A Combined Dependability and Security Approach for Third Party Software in Space Systems