Rule: VPC Security Groups Should Restrict Ingress TCP and UDP Access from 0.0.0.0/0
Ensuring proper security measures by restricting TCP and UDP access in VPC security groups.
| Rule | VPC security groups should restrict ingress TCP and UDP access from 0.0.0.0/0 |
| Framework | NIST 800-53 Revision 5 |
| Severity | ✔ High |
Rule Details:
This rule enforces the restriction of ingress TCP and UDP access from 0.0.0.0/0 for the VPC security groups in compliance with the NIST 800-53 Revision 5 security standard.
Troubleshooting Steps:
The following troubleshooting steps can be followed if there are any issues related to this rule:
- 1.
Verify Security Group Configuration: Check if the security group associated with the VPC has the necessary rules to restrict ingress TCP and UDP access from 0.0.0.0/0.
- 2.
Validate Protocol and Port Settings: Ensure that the correct protocols (TCP and UDP) are specified and that the appropriate ports are open or closed as required by the security policy.
- 3.
Check IP Range: Verify that the IP range specified is indeed 0.0.0.0/0, which represents all IP addresses. Any deviations from this range could lead to non-compliance.
Necessary Codes:
No specific codes are required for this rule. However, for effective enforcement, the following AWS CLI command can be used to create and modify security group rules:
aws ec2 authorize-security-group-ingress --group-id YOUR_SECURITY_GROUP_ID --protocol tcp --port PORT_NUMBER --cidr 0.0.0.0/0
Replace
YOUR_SECURITY_GROUP_IDPORT_NUMBERRemediation Steps:
Follow these step-by-step instructions to remediate any non-compliance related to this rule:
- 1.
Identify the VPC: Determine the VPC for which you need to enforce the ingress TCP and UDP access restriction.
- 2.
Review Security Group: Identify the security group associated with the VPC that needs to be modified.
- 3.
Remove Existing Rules: If there are any existing ingress rules allowing TCP or UDP access from 0.0.0.0/0, remove them. You can use the AWS CLI command mentioned earlier for this purpose.
- 4.
Create Restrictive Rules: Create new ingress rules for the security group that only allow access from specific IP ranges or subnets as needed. Make sure to specify the appropriate protocols and port numbers.
- 5.
Test Network Connectivity: Validate that the changes made to the security group do not impact the required network connectivity. Verify the connectivity with the desired TCP and UDP services.
- 6.
Documentation and Compliance Check: Update the security documentation to reflect the changes made to the security group configuration. Regularly review and audit the security group settings to ensure continuous compliance with the NIST 800-53 Revision 5 standard.
By following these steps, you can successfully enforce the restriction of ingress TCP and UDP access from 0.0.0.0/0 for VPC security groups, aligning with the NIST 800-53 Revision 5 security guidelines.