Targeted Attack Feasibility

Targeted Attack Feasibility is a structured methodology for assessing the level of difficulty and resources required for a potential attacker to successfully execute a specific attack path. It is a cornerstone of the Threat Analysis and Risk Assessment (TARA) process defined in the international automotive cybersecurity standard, ISO/SAE 21434. The assessment is based on rating several key factors, such as Elapsed Time, Specialist Expertise, Knowledge of the Item, Window of Opportunity, and the Equipment needed to perform the attack. By assigning a value to each factor, an overall feasibility level is determined. This approach transforms abstract threats into quantifiable risk metrics, allowing organizations to differentiate between theoretical vulnerabilities and practical, real-world threats. It provides the critical input needed to prioritize risks and develop effective mitigation strategies.

In enterprise risk management, Targeted Attack Feasibility is applied through a systematic, multi-step process: 1. **Identify Attack Paths**: Based on the system architecture and threat modeling (e.g., using STRIDE), potential attack paths are identified and visualized, often using attack trees. Each path represents a sequence of steps an attacker could take to compromise an asset. 2. **Evaluate Feasibility Factors**: For each step in an attack path, the five factors from ISO/SAE 21434 (Time, Expertise, Knowledge, Opportunity, Equipment) are rated. For instance, a remote attack exploiting a known software flaw would rate lower in required time and equipment than a physical attack requiring disassembly of a component. 3. **Determine Overall Feasibility and Risk**: The ratings are aggregated to calculate a final feasibility level for the entire attack path. This level is then combined with the attack's impact rating to determine the overall risk score. This enables enterprises to prioritize high-feasibility, high-impact threats, ensuring that cybersecurity resources are allocated efficiently to address the most probable and damaging risks, thereby achieving compliance with regulations like UNECE R155.

Taiwanese enterprises face several key challenges when implementing Targeted Attack Feasibility: 1. **Talent Gap**: There is a shortage of professionals with hybrid expertise in both automotive engineering and cybersecurity. This can lead to subjective and inconsistent feasibility assessments that rely heavily on individual experience. 2. **Supply Chain Complexity**: Accurately assessing feasibility requires detailed design information and a Software Bill of Materials (SBOM) from a multi-tiered supply chain. Obtaining this data is often difficult due to intellectual property concerns and inefficient communication channels. 3. **Lack of Tooling and Data**: Many companies still rely on manual processes using spreadsheets, which is inefficient and error-prone. A lack of access to automotive-specific threat intelligence databases makes it difficult to objectively rate factors like required expertise or time. **Solutions**: Enterprises can overcome these challenges by partnering with expert consultants to establish standardized processes, mandating cybersecurity deliverables in supplier contracts, and adopting specialized TARA software tools to automate analysis and centralize knowledge.

Winners Consulting specializes in Targeted Attack Feasibility for Taiwan enterprises, delivering compliant management systems within 90 days. Free consultation: https://winners.com.tw/contact