Control: 5.2 Ensure no security groups allow ingress from 0.0.0.0/0 to remote server administration ports

Description

Security groups provide stateful filtering of ingress and egress network traffic to AWS resources. It is recommended that no security group allows unrestricted ingress access to remote server administration ports, such as SSH to port 22 and RDP to port 3389, using either the TCP (6), UDP (17) or ALL (-1) protocols.

Public access to remote server administration ports, such as 22 and 3389, increases resource attack surface and unnecessarily raises the risk of resource compromise.

Remediation

Perform the following to implement the prescribed state:

1. Log in to the AWS Management Console at https://console.aws.amazon.com/vpc/home.
2. In the left pane, click Security Groups.
3. For each security group to remediate, perform the following:
4. Select the respective security group.
5. Choose the Inbound Rules tab.
6. Click Edit Inbound rules button.
7. Identify the rules to be edited or removed.
8. Either A) Update the Source field to a range other than 0.0.0.0/0 or B) Click Delete the offending inbound rule.
9. Click Save rules.