A Security Engineer has verified that the key has not been used, and has blocked port 22 to all EC2 instances while developing a response plan. How can the Security Engineer further protect currently running instances?

September 14, 2021 by Admin

A Developer’s laptop was stolen. The laptop was not encrypted, and it contained the SSH key used to access multiple Amazon EC2 instances. A Security Engineer has verified that the key has not been used, and has blocked port 22 to all EC2 instances while developing a response plan.

Delete the key-pair key from the EC2 console, then create a new key pair.
Use the modify-instance-attribute API to change the key on any EC2 instance that is using the key.
Use the EC2 RunCommand to modify the authorized_keys file on any EC2 instance that is using the key.
Update the key pair in any AMI used to launch the EC2 instances, then restart the EC2 instances.