Inbound MySQL access is restricted

Classification:

compliance

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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

Console

Follow the Security group rules docs to learn how to add a security group rule that will restrict access to a specific port.

CLI

Run revoke-security-group-ingress to remove inbound rules that allow unrestricted access to port 3306.

revoke-security-group-ingress.sh

    aws ec2 revoke-security-group-ingress
        --group-name group-name
        --protocol tcp
        --port 3306
        --cidr 192.0.2.0/24
    

Run authorize-security-group-ingress to add new inbound rules that restrict port 3306 access.

revoke-security-group-ingress.sh

    aws ec2 authorize-security-group-ingress
        --group-name your-group-name
        --protocol tcp
        --port 3306
        --cidr 192.0.2.0/24
    