.png)
What is Threat Modelling?
According to the OWASP (Open Web Application Security
Project), "threat modelling is a procedure for optimising application,
system, or business process security by identifying objectives and
vulnerabilities, and then defining countermeasures to prevent or mitigate the
effects of threats to the system."
The STRIDE Threat Modelling Framework - STRIDE, developed by Microsoft, stands for:
- Spoofing Identity
- Tampering with Data
- Repudiation
- Information Disclosure
- Denial of Service (DoS)
- Elevation of Privilege
Each component of STRIDE represents a category of threat, helping security teams pinpoint vulnerabilities and mitigate the associated risks.
- Spoofing
Spoofing refers to impersonating another entity to gain unauthorised access to systems, networks, or data. This can involve forging identities, such as user credentials or IP addresses, to gain access to sensitive information or functions. Spoofing occurs when an attacker pretends to be someone or something else to gain unauthorised access to a system. It often involves stealing credentials or forging digital signatures.
Tampering involves maliciously altering data, files, or systems, potentially causing harm or data corruption. Attackers can modify data in transit or at rest to change its meaning or functionality. Tampering leads to integrity issues, as attackers may modify files, messages, or database entries without authorisation.
Repudiation occurs when a user denies performing an action, and the system lacks sufficient evidence to counter the claim. This lack of accountability can be exploited by attackers to carry out actions while remaining anonymous.
- Information Disclosure
Information disclosure refers to the unauthorised exposure of sensitive data to individuals who should not have access to it. This can occur during data storage, transmission, or processing.
- Denial of Service (DoS)
Denial of Service involves actions that prevent legitimate users from accessing services, either by overwhelming a system with traffic or exploiting vulnerabilities that disrupt normal functionality.
- Elevation of Privilege
In an elevation of privilege attack, an attacker gains higher access rights than they should have, potentially allowing them to control the system or modify critical settings.
How Does STRIDE Work?
To implement the STRIDE framework, organisations typically follow these steps:
Define the System -Start by creating a detailed diagram of the system, identifying all key components, data flows, and trust boundaries. These boundaries indicate where interactions could be exploited by attackers.
Identify Threats For each system component, analyse potential threats using the STRIDE categories. For example, assess whether a given component is vulnerable to spoofing, tampering, or information disclosure.
Assess Impact and Prioritise - Assess the potential impact each threat could have on the system, and prioritise them based on severity. High-priority threats require immediate attention, while others might be mitigated later.
Develop Mitigation Strategies Implement security controls and strategies to mitigate them. This could involve adding encryption, improving authentication mechanisms, or enhancing logging and monitoring systems.
Validate and Update Continuously validate and update the model as the system evolves, ensuring that new threats or vulnerabilities are captured.
Benefits of STRIDE for Threat Modelling
Using STRIDE as a framework for threat modelling offers several advantages:
- Systematic Approach: By categorising threats, STRIDE ensures a systematic assessment of potential risks, helping security teams address each category comprehensively.
- Structured Risk Identification: STRIDE facilitates clear identification of the types of risks a system might face, ensuring no critical threat categories are overlooked.
- Improved Communication: The model provides a common language for developers, security teams, and business stakeholders to discuss potential vulnerabilities and their impact.
- Tailored Mitigations: Each category in STRIDE comes with its own set of mitigation techniques, allowing teams to implement targeted countermeasures for specific threats.
Integrating STRIDE with OWASP’s Threat Modelling Guidelines
OWASP emphasises that "the earlier you implement threat modelling in the design phase, the more secure your application will be." STRIDE complements this by providing a structured model to evaluate security risks early in the software development lifecycle. When combined with OWASP’s guidance, STRIDE can ensure security is built into the architecture from the ground up, rather than retrofitted after a breach occurs.
When integrated with OWASP’s broader threat modelling practices, STRIDE empowers organisations to proactively design, implement, and maintain secure systems, reducing the risk of attacks and ensuring the confidentiality, integrity, and availability of their data and services.
Reference -
.
Post a Comment