Is ASD Essential Eight Enough? Comparing It to Cybersecurity Frameworks Like NIST CSF and ISO 27001

Modern cybersecurity frameworks offer essential guidelines to help businesses manage and mitigate cyber risks for organisations managing Executive level demands for Governance, Risk, and Compliance (GRC). But not all frameworks are created equal. One question frequently asked is: What’s the difference between ASD Essential Eight and frameworks like NIST CSF or ISO 27001? While ASD Essential Eight is an excellent starting point for many businesses, others may require more comprehensive coverage. Let’s explore the key distinctions.

What is ASD Essential Eight?

ASD Essential Eight, developed by the Australian Signals Directorate (ASD), is a set of eight key controls designed to help organisations protect against common cyber threats. These controls offer a minimum baseline for cybersecurity and are highly effective in providing essential protection to businesses across various sectors. However, it’s important to note that ASD Essential Eight is not as comprehensive as more complex frameworks like NIST CSF and ISO 27001, which offer more tailored approaches depending on an organisation’s specific needs and risks.

That said, for many small and medium-sized businesses, ASD Essential Eight is an invaluable tool for quickly implementing critical controls to reduce cyber risks. It is often the first step on the cybersecurity journey.

NIST CSF and ISO 27001: Tailored, Risk-Based Frameworks

For organisations that face more sophisticated threats or require greater flexibility, NIST CSF and ISO 27001 provide risk-based approaches, enabling businesses to assess their specific risk profiles and implement appropriate controls.

NIST Cybersecurity Framework (CSF): Developed by the U.S. National Institute of Standards and Technology (NIST), NIST CSF focuses on continuous risk monitoring and adapting to real-time threats. This framework is particularly useful for businesses that want a solid reference framework but with the flexibility to self-assess against the controls and requirements.

ISO 27001: An internationally recognised standard, ISO 27001 provides businesses with a structured, risk-based approach to cybersecurity management. Its flexibility allows organisations to tailor controls based on their specific needs and operations. ISO 27001 also offers certification, providing a competitive advantage for businesses operating globally and who want to demonstrate their compliance with the framework via an external audit and certification process.

Key Differences: ASD Essential Eight & Comprehensive Frameworks

Scope of Implementation:

ASD Essential Eight: A prescriptive set of eight controls designed to provide basic cybersecurity protection for Australian businesses. The Essential Eight is also more of a “point-in-time” implementation compared to the other frameworks.

NIST CSF and ISO 27001: Flexible frameworks that allow organisations to implement tailored controls based on their specific risk profiles. Notably, these frameworks require top level management engagement and support as a feature of compliance with the framework. There is also an ongoing plan-do-check-act, or continual monitoring and improvement, aspect to both frameworks.

Flexibility:

ASD Essential Eight: While highly effective, Essential Eight is more prescriptive and may not offer the flexibility that some larger or more complex organisations need.

NIST CSF and ISO 27001: Highly adaptable to each organisation’s needs, allowing businesses to implement only the necessary controls, procedures, and processes based on an ongoing risk assessment.

Risk Management:

ASD Essential Eight: Provides straightforward controls but does not include a formal, structured risk evaluation process. This can lead to a situation where the control is “all on” in order to meet compliance, instead of a more pragmatic approach of understanding the risk and applying the control relative to the risk score.

NIST CSF and ISO 27001: Allow organisations to evaluate risks continuously, offering more comprehensive risk management strategies in real-time and leading to the practical implementation of controls at the appropriate level to address organisational risks.

Tailoring Security to Risk Levels and Threats

ASD Essential Eight uses maturity levels (1, 2, and 3) to determine the level of protection needed based on the adversaries an organisation might face. For example, a typical Australian mid-sized business might aim for Level 2 to 2.5 in order to strike a balance between robust security and complexity. On the other hand, NIST CSF and ISO 27001 enable businesses to fine-tune their controls based on identified risks and adversaries, offering more adaptability to different business contexts, whilst also applying a more holistic, top down organisational engagement model.

Notable Gap in ASD Essential Eight

While ASD Essential Eight covers fundamental security controls, one notable gap is network segmentation, a control that limits an attacker’s ability to move freely across a network. At Proaxiom, we often recommend network segmentation during consultations as it significantly strengthens overall security. We recommend starting the process with a current state assessment and gap analysis relative to the organisation’s risk profile and target state, and identifying any additional controls that make sense for the organisation to implement in order to significantly reduce their risk exposure.

Final Thoughts: Choosing the Right Framework

ASD Essential Eight provides an excellent foundation for organisations just beginning their cybersecurity journey or those that need a straightforward, actionable set of controls. However, as businesses grow or face more complex threats, supplementing ASD Essential Eight with more comprehensive frameworks like NIST CSF or ISO 27001 may be necessary. Ultimately, the right choice depends on your organisation’s needs and risk exposure profile. Do you know what yours are?