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      Blog

      Securing Azure Datacenters

      New Signature / Blog / Securing Azure Datacenters
      January 31, 2018January 24, 2018| Bryan Lloyd
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      A common misconception about consuming Azure public cloud services is that Microsoft is taking care of all security aspects. Although this is partially true, as a consumer of Azure public cloud services, you are responsible for some of the security controls. The number and areas of security controls you are responsible for depends on which type of public cloud services you are consuming– Software-as-a-Service (SaaS), Platform-as-a-Service (PaaS) or Infrastructure-as-a-service (IaaS).

      Microsoft will manage most of the security controls within SaaS, a significant portion within of PaaS, and a small portion within IaaS. Conversely, you will need to manage most of the controls within IaaS, some within PaaS and a small portion within SaaS.

       

      Azure PaaS services can be consumed under two models:

      1. Multi-tenant, public IP accessible.
      2. Dedicated virtual network (v-net) integrated.

      Multi-tenant PaaS is hosted on virtual infrastructure shared with other customers, whereas PaaS dedicated is provisioned on virtual infrastructure dedicated for your use. With the dedicated v-net integrated model, you are responsible for implementing more security controls; however, as the solution is not publicly accessible over the internet, with appropriate monitoring and governance provides an improved security model.

      When securing Azure datacenters, one challenge is to ensure you find the correct balance between enterprise IT governance, security and line-of-business developer agility. One approach to this is to have different standards between production and non-production environments, this way developers can have the freedom to innovate within an environment with fewer controls whilst still having the required governance and controls within the production environment.

      The following security pillars in Azure are areas to focus on when implementing your security controls.

      • Encryption

      Encrypting data at rest and in-transit ensures that if the network or if data is ever compromised, it will not be possible for an attacker to access the content. Encryption keys should be stored in an Azure Key Vault with lifecycle management.

      • Identity

      Ensuring your target operating model matches your Role Based Access Control (RBAC) design, and that a process for segregating duties exists will reduce risk.

      • Software Defined Networking

      Making sure workloads of different trust levels are segregated and that traffic visibility is provided to security operation centers are some critical controls.

      • Compliance

      IaaS workloads should be hardened to a defined standard with agreed core applications and any deviations should be reported and remediated.

      • Monitoring and Reporting

      Proactive monitoring of security controls is important and ideally, auto-remediation of any issues should be the desired outcome.

      • Availability

      Availability design is critical in order to meet the recovery time objectives for a wide range of events and ensure applications continue to operate.

       

      The following is a more comprehensive list of security controls and the tools/solutions available within Azure to meet the controls:

       

            Azure Security Controls                                       Azure Tools and Solutions

      Network Subscription and Network Segregation. Subnet and NSG Design, WAF & NGF Firewalls
      Monitoring Log Analytics, Azure Monitor, Azure AD, Azure Security Centre, Azure Network Watcher
      Virtual Machine Build Compliance Hardening Standards, ARM Templates, DSC Core Application Installation Process, Certification
      Cryptography and Secret Management OS Disk Encryption, Key Vault
      Vulnerability Scanning Qualys Scanning Appliance and Security Centre agent
      System and Software Vulnerability Management SCCM, OMS Patching
      Cloud Security Azure Platform and OS Logs sent to SIEM and SOC. OMS, ATA
      Identity & Access Management Identity for Portal and Host Access, MFA, Jump Box Design
      Malware Protection Deploy chosen Anti-Malware agent as part of build process
      User Access Rights Design RBAC model, Azure policy design, reduced elevated privilege use
      Backup Encrypted Backups, data restore process
      Availability Design, availability sets and zones and backup data centre locations

      Contact New Signature to ensure your Azure environment is being designed in a secure manner and that you are meeting the required controls.

       

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