Amazon’s approach to security is based on “shared responsibility” between users and AWS – Security Groups is one of the tools Amazon provides for users to fulfill their part. One would expect that when it comes to security, users don’t err.

We were actually amazed by how common bad configuration of AWS EC2 Security Groups happens to be. Slips are as risky as opening all IP ports to the whole Internet, but also lighter ones as allowing access to all ports from any AWS addresses.

Check out this related insight - Unnecessary Security Groups Ports are open on DB Server

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