As Microsoft faces the challenge of implementing large-scale enterprise security policies, the traditional models of managing Network Security Groups (NSGs) have shown limitations. The centralized model, decentralized model, and hybrid model each come with their own drawbacks, such as operational overhead, security risks, and lack of strict enforcement. To address these challenges, Microsoft is transitioning to a new approach with Azure Virtual Network Manager.
Azure Virtual Network Manager allows the governance team to create and enforce network baselines across multiple NSGs, ensuring that critical security policies are consistently applied across the organization. By utilizing network groups and Azure Policy, security rules can be automatically applied to virtual networks that meet specific conditions. This automated approach streamlines the process of managing security policies, while allowing application teams to also manage their own NSG rules, as long as they align with the overarching administrative rules.
One of the main use cases for Azure Virtual Network Manager is the creation of network baselines to block high-risk ports and implement zero-trust principles. High-risk ports, associated with security risks such as malware and unauthorized access, are blocked by default in NSGs. The zero trust baseline enforces least privilege network security by only allowing the minimum traffic required for each service, reducing the overall risk. This shift towards network automation enhances security measures and ensures consistency in policy enforcement throughout the organization.
Overall, Azure Virtual Network Manager presents a more efficient and effective way for Microsoft to manage network security at scale. By combining automation with flexibility for application teams, Microsoft can uphold stringent security standards while adapting to the dynamic nature of modern networks. This approach benefits both Microsoft and its customers by providing a robust security framework that addresses the complexities of enterprise networking.
Article Source
https://azure.microsoft.com/en-us/blog/using-microsoft-azure-virtual-network-manager-to-enhance-network-security/