![]() In AWS, by enabling JIT-access the relevant rules in the attached EC2 security groups, for the selected ports, are revoked which blocks inbound traffic on those specific ports. If there are no existing rules on the selected ports, then the new rules take top priority in the NSG and Azure Firewall. If other rules already exist for the selected ports, then those existing rules take priority over the new "deny all inbound traffic" rules. These rules restrict access to your Azure VMs’ management ports and defend them from attack. Defender for Cloud ensures "deny all inbound traffic" rules exist for your selected ports in the network security group (NSG) and Azure Firewall rules. In Azure, you can block inbound traffic on specific ports, by enabling just-in-time VM access. ![]() How JIT operates with network resources in Azure and AWS With JIT, you can lock down the inbound traffic to your VMs, reducing exposure to attacks while providing easy access to connect to VMs when needed. To solve this dilemma, Microsoft Defender for Cloud offers JIT. Your legitimate users also use these ports, so it's not practical to keep them closed. In this case that means having fewer open ports especially management ports. Why JIT VM access is the solutionĪs with all cybersecurity prevention techniques, your goal should be to reduce the attack surface. ![]() When a VM is successfully compromised, it's used as the entry point to attack further resources within your environment. All of your virtual machines are potential targets for an attack. Threat actors actively hunt accessible machines with open management ports, like RDP or SSH. The risk of open management ports on a virtual machine To learn how to apply JIT to your VMs using the Azure portal (either Defender for Cloud or Azure Virtual Machines) or programmatically, see How to secure your management ports with JIT. This page explains the principles behind Microsoft Defender for Cloud's just-in-time (JIT) VM access feature and the logic behind the recommendation.
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