The increasing complexity of cloud infrastructures and the expanding security perimeter necessitate a rethinking of protection approaches. Traditional models, based on the “trust internal, distrust external” principle, prove ineffective in distributed systems, with mobile workers, and across multiple cloud services. The Zero Trust Security concept offers a radically different approach: never trust, always verify, regardless of whether a request originates from within the network or externally.
Core principles of Zero Trust
At the heart of the Zero Trust model are three key principles that form its core and distinguish it from outdated security approaches:
- Verify Explicitly: Every user, device, application, and workload attempting to access resources must be explicitly verified. This includes checking identity, device state, policy compliance, and other contextual factors before granting access.
- Use Least Privileged Access: Access is granted only to the resources absolutely necessary to perform a specific task, and only for the required duration. This minimizes potential damage in the event of an account or device compromise.
- Assume Breach: Always operate under the assumption that the system is already compromised or could be compromised. This means continuous monitoring, network segmentation, and readiness for rapid incident response.
Implementing Zero Trust in cloud environments
Transitioning to Zero Trust in the cloud requires a comprehensive approach covering identity, access, network, and data. Here are the key steps:
1. Identity and Access Management (IAM):
- Implementing Multi-Factor Authentication (MFA) for all users and administrators.
- Utilizing conditional access, which considers context (location, device, behavior) for access decisions.
- Applying Just-In-Time (JIT) and Just-Enough-Access (JEA) for administrative privileges.
- Regular auditing of access rights.
2. Network microsegmentation:
- Dividing the network into small, isolated segments, where each application or service has its own “micro-perimeter.”
- Applying Next-Generation Firewalls (NGFW) and network security policies between segments to control traffic based on identity and context.
- Using VPN and ZTNA (Zero Trust Network Access) for secure remote user access.
3. Endpoint and device protection:
- Implementing EDR/XDR solutions for detecting and responding to threats on endpoints.
- Managing mobile devices (MDM) and applications (MAM) to ensure compliance with security policies.
- Continuous assessment of device status (compliance, updates, antivirus presence) before granting access.
4. Data and application protection:
- Encrypting data both at rest and in transit.
- Implementing DLP (Data Loss Prevention) to prevent unauthorized data leakage.
- Regularly scanning applications for vulnerabilities and ensuring security at the API level.
Comparing traditional approach and Zero Trust
| Characteristic | Traditional security (perimeter-based) | Zero Trust Security |
|---|---|---|
| Core principle | Trust in the internal network, distrust of the external | Never trust, always verify |
| Perimeter | Clearly defined, static | Blurred, dynamic, decentralized |
| Access | Broad access after network verification | Explicit verification for each request, least privilege |
| Monitoring | Primarily at the perimeter | Continuous monitoring of all interactions |
| Response to compromise | Focus on preventing intrusion | Assume breach, rapid detection and isolation |
How SL Global Service addresses this
The SL Global Service team helps Ukrainian companies implement Zero Trust architecture in their cloud and hybrid environments, leveraging best practices and technologies from their stack. SGS engineers begin with a detailed IT audit of the current infrastructure to identify critical points and develop a tailored transition strategy.
For identity and access management, SGS uses Microsoft Entra ID (Azure AD), implementing Multi-Factor Authentication (MFA), conditional access, and Just-In-Time (JIT) / Just-Enough-Access (JEA) principles for administrative accounts. This ensures robust verification of every resource request.
In the realm of cybersecurity and microsegmentation, solutions such as Microsoft Defender for Cloud, Cisco Firepower, Fortinet, and Palo Alto are used to create granular network security policies. This allows for the isolation of critical applications and data, minimizing the risk of threat propagation. For endpoint protection, Microsoft Defender for Endpoint and CrowdStrike are implemented, providing EDR/XDR functionality and continuous device monitoring. For secure remote access, SGS integrates ZTNA solutions like Cisco Umbrella or Microsoft Entra Application Proxy.
In cloud platforms such as Microsoft Azure, AWS, and Google Cloud, the SL Global Service team architects infrastructure with Zero Trust principles in mind, utilizing built-in security features (e.g., Azure Policy, AWS IAM, Google Cloud Identity and Access Management) and integrating third-party solutions. For VDI environments like Azure Virtual Desktop or Windows 365, enhanced access and monitoring policies are applied.
Monitoring and analysis of security events are implemented using Microsoft Sentinel and Splunk, allowing SGS engineers to detect anomalies 24/7, respond to potential threats, and continuously improve the client’s security posture. The Managed Cloud 24/7 service guarantees continuous control and prompt incident response.
The SL Global Service team also assists with cost optimization (FinOps), ensuring that Zero Trust solutions are not only effective but also economically viable, considering the specifics of cloud resources.
Implementing Zero Trust Security is not a one-time project but a continuous process of evolving security culture and technologies. Start with an audit of your current state, identify priority areas, and gradually integrate Zero Trust principles into your cloud infrastructure, engaging experienced partners to ensure reliable protection of your critical data and systems.