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Description
Reduce the probability of a breach by checking EC2 security groups for inbound rules that allow unfettered access to TCP port 3306 (used by the MySQL Server) and restrict access to IP addresses that require this port.
Rationale
Malicious activity, such as denial-of-service (DoS) attacks and hacking, can occur when permitting unfettered access to this port.
Remediation
From the console
Follow the Security group rules docs to learn how to add a security group rule that will restrict access to a specific port.
From the command line
Run revoke-security-group-ingress to remove inbound rules that allow unrestricted access to port 3306.
