Azure - Just-in-time Access

Introduction to Just-in-time Access

• Just-in-Time (JIT) Access in Azure is a security feature designed to reduce the attack surface by allowing users to request access to a virtual machine (VM) only when needed, and only for a specified period.

• This helps ensure that VMs are not constantly exposed to potential threats by having ports open unnecessarily.

• Here’s how Just-in-Time Access works in Azure:

1. Configuration:
   • Administrators can configure JIT access for VMs in the Azure Security Center.
   • They define the specific ports to be protected (e.g., RDP port 3389, SSH port 22), the maximum allowed time for access, and approved IP ranges.
2. Access Request:
   • When a user needs to access a protected VM, they request access through the Azure portal.
   • The request specifies the VM, the required ports, and the duration of access.
3. Approval and Logging:
   • The request can be automatically approved based on predefined policies or require manual approval from an administrator.
   • All access requests and activities are logged for auditing and monitoring purposes.
4. Temporary Access:
   • Once approved, Azure automatically configures the Network Security Group (NSG) to allow inbound traffic to the specified ports from the requester’s IP address for the defined period.
   • After the time period expires, the NSG rules revert to their default state, blocking access again.

Benefits of Just-in-Time Access

• Reduced Attack Surface: By keeping ports closed except when needed, JIT access minimizes the exposure to potential attacks.
• Improved Security Posture: Limiting access to a specific timeframe and IP range ensures that only authorized users can access VMs when necessary.
• Audit and Compliance: All access requests and approvals are logged, providing a detailed audit trail that helps with compliance and security investigations.
• Operational Efficiency: Simplifies management of access permissions by allowing temporary access without the need for long-term changes to security configurations.