Risk Management in the Development Process A Progress Report
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1 Risk Management in the Development Process A Progress Report
2 1 Introduction 2 Smart Meter Gateway - basic facts 3 Real Life Example
3 Introduction Industry 4.0 and IoT gain importance of Embedded Systems Hardware Costs decline Pressure to innovate and high speed of development dominate Part of the Game: Smart Meters and Smart Meter Gateways with distinct communication over (insecure) networks
4 Introduction Term Risk Risk Management Definition The likelihood of an unwanted incident and its consequence for a specific asset. (see CORAS) Coordinated activities to direct and control an organisation with regard to risks. (see CORAS)
5 Introduction Examples of Development Risks People Risks - availability, skill level, experience Size Risks - handling of large teams, increased complexity in large products Process Risks - well defined development process Technology / Tool Risks - new or complex technology increases the risk, availability of reliable tool chains (development environmen, CASE tools) Organisational Risks - financial stability, organisational threats, change in company focus Estimation Risks / Planning Risks - resource estimates and product development time Customer Risks - changes to the customer requirements
6 Smart Meter Gateway - Overview records energy consumption data transmits energy consumption data to meter operators utilizes a trusted communication channel with the administrator part of the critcial infrastructure needs to be security evaluated (Common Criteria, ISO 15408) on evaluation assurance level SMGW installations expected until end of 2020
7 Smart Meter Gateway - Functional Requirements Storage of meter data and application of tariffing profiles Remote administration channel Support of different meter types user interface for displaying consumption data multi-client capability Support of cryptographic algorithms
8 Smart Meter Gateway - Security Requirements Secure Storage of private key material HSM chip Pre-Personalization during production Final Personalization during installation Secure communication channels TLS and symmetric cryptographic protocols TLS to communication partners in WAN, HAN and LMN AES secured crypto in LMN (wireless communications) Passive tampering and modification detection Tampering and modification of hard- and software needs to be detected (or be detectable) Functional correctness pertaining Technical Guideline TR Manufacturer must demonstrate complete support of required functionality
9 Smart Meter Gateway - Cost assumption Cost-Benefit Analysis was published by Ernst & Young in 2013 (Kosten-Nutzen-Analyse für einen flächendeckenden Einsatz intelligenter Zähler), on behalf of Federal Ministry for Economic Affairs and Energy cost factor value amortisation period Ferraris meter 25 EUR 16 years Intelligent meter 80 EUR 13 years BSI conformant meter 55 EUR 13 years SMGW with HSM, without communication module 80 EUR 13 years SMGW with HSM comm. module and meter 175 EUR 13 years Installation costs per meter EUR 13 years Installation costs per Gateway EUR 13 years Installation costs per meter / gw. in comb EUR 13 years
10 Smart Meter Gateway - Development Risks What kind of risks arise? In general most of the risks listed on slide 5 cost limits: (organisational risks, estimation risks, customer risks) unfinished specification (organisational risks, estimation risks, people risks) unfinished security requirements (organisational risks, estimation risks, people risks, tool risks, technology risks) Development was based on unstable external foundations. How to handle this situation?
11 Chosen strategy Functional and security requirements define the lower bound of a possible development budget During analysis, the security requirements were focussed due to their strong influence on development time and budget Setup a team of experienced sw-engineers and: perform use-case analysis technology studies set up management framework (requirement lists, define sw-development process) get an idea of the required tool chain Following slides show some aspects of the security analysis.
12 Metrics Definition Tabelle: Defined Metrics Metric Fulfilment of the security requirements formulated Development and production costs Knowledge and knowledge management Availability Explanation Consideration of whether or not a suggested measure / a combination of several measures addresses a given IT security target Costs for the implementation of a suggested measure. Important indicator for staying within the planned development and production budget. Consideration of whether or not the existing engineering knowledge required for implementation of the identified IT security measure is available. Availability of ready partial solutions, use of OTS (off-theshelf) components
13 Requirements Analysis and System Design subject Environmentand Assumptions Security Targets Adversary Model Security Requirements questions communication interfaces? communication protocols? Are there any trusted external entities? Public or secure environment? Should data be stored or exchanged and what are the relevant security requirements? What might an attacker be capable of? Which interfaces of the system need to be considered in terms of defining the security requirements? Based on assumptions
14 Threat Modeling set up a model of all interfaces and communication flows model closed gaps in the unfinished specification (Techncial Guideline) Identification of threats, risks and potential weaknesses application of S.T.R.I.D.E classification and D.R.E.A.D risk rating STRIDE threat categories: Spoofing of user identity Tampering Repudiation Information disclosure (privacy breach or data leak) Denial of service (D.o.S) Elevation of privilege The categories are: Damage - how bad would an attack be? Reproducibility - how easy is it to reproduce the attack? Exploitability - how much work is it to launch the attack? Affected users - how many people will be impacted? Discoverability - how easy is it to discover the threat?
15 Security Concept Model Type Static Security Model Content Covers all aspects of relevance independent from the data flow. List of Threats and Assets Physical Security Firmware Security (Reverse Engineering Protection, Encryption) Disk Encryption Used Cryptographic Mechanisms Key Material Dynamic Security Model Covers all aspects of dynamic system behavior. List of Threats and Assets communication matrix resource separation availability cryptographic algorithms network interfaces, updates, administration
16 Results and Next Steps Hardware based on OTS components Open Source Operating System (Linux) All security features implemented Ongoing security evaluation Participant in field tests
17 Lessons learned The focus on the security requirements has identified the top development efforts. Threat modeling helps in understanding the data flows (because a threat model requires data flows and helps identifying unclear or inconsistent specifications). Technology studies before starting an implementation reduces peoples risks (increases knowledge) and technology risks
18 Questions? armin.lunkeit(at)openlimit.com
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