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Threat modelling

Threat modelling. A short introduction and stories from end user involvement SRM Seminar Luxembourg 22.06.2010. Per Håkon Meland - SINTEF ICT, Trondheim, Norway http://www.sintef.com/. Motivation and background. Hospital systems (2005 ) Integration and access control of EPRs

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Threat modelling

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  1. Threat modelling A short introduction and stories from end user involvement SRM Seminar Luxembourg 22.06.2010 Per Håkon Meland - SINTEF ICT, Trondheim, Norway http://www.sintef.com/

  2. Motivation and background

  3. Hospital systems (2005 ) • Integration and access control of EPRs • Models used to communicate processes and threats

  4. SHIELDS • EU project • 2008-2010 • 8 partners • Sharing of security knowledge • Models • Methods • Tools and tool input • End user evaluations • Sevaral iterations • Real end-users • Case studies and commercial products

  5. Threat modelling

  6. Threat modelling • Misuse cases and attack trees • Understand potential security threats and vulnerabilities • Understand attackers • Find security design issues before code • Determine countermeasures • Guide the code review /testing/configuration /deployment • Highly reusable • Easy to grasp

  7. Example: Media player

  8. Xine media player

  9. Let’s create a model from scratch…

  10. Main functionality: • Download data (application, codecs, skins, ...) • Play local media file • Play media stream • Actors: • Software developer • User

  11. How about reusing one?

  12. Search for existing misuse case diagrams: • “Media”, “player”, “Movie”

  13. Attack trees

  14. Hide the details • Link to attack patterns • Used to identify mitigations

  15. Finally…

  16. Create textual description to accompany the diagram • A document elaborating the diagram • Threat descriptions can be fetched from the SHIELDS SVRS • Gives an understanding of the possible attacker motivation • There can be several different mitigations • Input to risk analysis and security activity planning

  17. Case study: eTourism

  18. Approach Phase 1: Tutorial 2:Threat model created by experts 4:Model consolidated by experts 6:Threat model endorsed by experts 5:Threat model updated by developers 1:Application description 3:Threat model created by developers Phase 2: Parallel modelling Phase 3: Serial modelling

  19. Pre-visit, plan: • Hotels • Route • Experiences • Virtually explore • Post-visit, share • Pictures/videos • Route • Recommendations • Blog • Bad stuff?

  20. Case study: WaLDo

  21. Warehouse information system • Dock loading • RFID tracking • Picking lists • Advanced shipping notifications • Bad stuff?

  22. Case study: eNewsPaper

  23. Electronic newspaper • Aimed for the Paris metro • Shared from distribution points • User relays • Bad stuff?

  24. Feedback and lessons learned • New threats and mitigations were identified in all case studies • Misuse cases and attack trees: Easy to learn, easy to use • Important with diversity while doing threat modelling • Keep the size of the models down • Need more models from other application areas

  25. Share models through the SVRS! • Now contains >200 free security models • 18 misuse case models • 29 attack trees • Use the free tools, or integrate your own • Add your own, get feedback (and possibly revenue) • http://www.shields-project.eu

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