Ensure the default security group of every VPC restricts all traffic

MediumLevel 1Manual reviewibmcloud

Description

VPC security groups provide stateful filtering of ingress/egress network traffic to Virtual Server. It is recommended that no security group allows unrestricted ingress access to a Virtual Server. Unless modified, the default security group allows inbound traffic from all members of the group that is, all other virtual servers that are attached to this security group. Removing uncontrolled connectivity to a Virtual Server, reduces a server's exposure to risk.

How it is checked

Audit method: Manual review

This recommendation cannot be checked automatically. A scan lists it with these instructions when you pass --include-manual.

Perform the following tasks to determine if the account is configured as prescribed: Using Console: 1. Login to the IBM Cloud Portal at https://cloud.ibm.com. 2. At the Menu icon, select VPC Infrastructure, VPC Layout, Security Groups`. 3. For the default security group, perform the following: a. Ensure no Inbound Rule exists that allows unrequited traffic to the Virtual Servers.

How it is fixed

Fix method: Guidance or infrastructure patch

Using Console: 1. Login to the IBM Cloud Portal at https://cloud.ibm.com. 2. At the Menu icon, select VPC Infrastructure, VPC Layout, Security Groups. 3. For the default security group, perform the following: a. Identify the Inbound rule. b. Update the rule to only allow the required traffic flow.

Properties

Operating systems: Any
Tags: cloudibmcloudnetwork
Reference: CIS IBM Cloud Foundations Benchmark v2.0.0 - 6.2.2 Ensure the default security group of every VPC restricts all traffic