Control: 4.1 Ensure no security groups allow ingress from 0.0.0.0/0 to port 22

Description

Security groups provide stateful filtering of ingress/egress network traffic to AWS resources. It is recommended that no security group allows unrestricted ingress access to port 22.

Removing unfettered connectivity to remote console services, such as SSH, reduces a server's exposure to risk.

Remediation

Perform the following to implement the prescribed state:

1. Login to the AWS Management Console.
2. In the left pane, click Security Groups.
3. For each security group, perform the following:
4. Select the security group.
5. Click the Inbound Rules tab.
6. Identify the rules to be removed.
7. Click the x in the Remove column.
8. Click Save.