Rule: VPC Security Groups Should Restrict Ingress TCP and UDP Access from 0.0.0.0/0
Detailed guide on ensuring VPC security group compliance by restricting ingress TCP and UDP access from 0.0.0.0/0.
| Rule | VPC security groups should restrict ingress TCP and UDP access from 0.0.0.0/0 |
| Framework | Federal Financial Institutions Examination Council (FFIEC) |
| Severity | ✔ High |
VPC Security Group Rule for FFIEC Compliance
Rule Description
To comply with the Federal Financial Institutions Examination Council (FFIEC) guidelines, ingress TCP and UDP traffic to Virtual Private Cloud (VPC) security groups should not be allowed from the entire internet, which is specified as 0.0.0.0/0 in CIDR notation. This rule is to ensure that sensitive financial data and resources within a VPC are not exposed to potential threats or unauthorized access from the internet. It helps in keeping the attack surface minimal.
Troubleshooting & Verification Steps
- 1.
Review Existing Security Groups: Log in to the AWS Management Console, navigate to the VPC dashboard, and review existing security group rules.
- 2.
Identify Unauthorized Rules: Look for ingress rules that permit traffic from 0.0.0.0/0 to TCP or UDP ports.
- 3.
Validate Access Necessity: For any identified rules, confirm whether the open access is strictly necessary, and if a narrower IP range can be used instead.
- 4.
Check Connection Logs: If the security groups are already applied to instances, check access logs to see if unauthorized access attempts were made.
If unauthorized access or broad range rules are identified, proceed with the remediation steps.
Remediation Steps
Step 1: Modify Security Group Rules
- 1.
Access VPC Console: Navigate to the VPC section in the AWS Management Console.
- 2.
Select Security Group: Choose the security group with the non-compliant rule.
- 3.
Edit Inbound Rules: Select the 'Inbound Rules' tab and find rules that allow 0.0.0.0/0 access.
- 4.
Update Rules: Click 'Edit' and replace 0.0.0.0/0 with the specific IP range or remove the rule as needed.
- 5.
Save Changes: Click 'Save' to apply the changes.
Step 2: Configure New Security Group Rules (if necessary)
If new rules need to be created:
- 1.Choose 'Create Inbound Rule'.
- 2.Provide the necessary protocol, port range, and source IP range that does not include 0.0.0.0/0.
- 3.Click 'Add Rule' and then 'Save'.
Step 3: Apply Security Group to Instances
If the modified security group is not attached to the necessary instances or resources:
- 1.Navigate to the 'EC2' section in the AWS Management Console.
- 2.Select the instance and choose 'Actions'.
- 3.Click on 'Networking' and then 'Change Security Groups'.
- 4.Select your security group and save changes.
Necessary CLI Commands
To check security groups via CLI and update them, you would use the AWS CLI commands like:
# List security groups and their rules aws ec2 describe-security-groups # Identify the group with ingress rules from 0.0.0.0/0 aws ec2 describe-security-groups --filters Name=ip-permission.cidr,Values=0.0.0.0/0 # Update the security group to remove ingress from 0.0.0.0/0 aws ec2 revoke-security-group-ingress --group-id YOUR_SECURITY_GROUP_ID --protocol tcp --port PORT_RANGE --cidr 0.0.0.0/0 aws ec2 revoke-security-group-ingress --group-id YOUR_SECURITY_GROUP_ID --protocol udp --port PORT_RANGE --cidr 0.0.0.0/0 # Optionally add new ingress rules if needed aws ec2 authorize-security-group-ingress --group-id YOUR_SECURITY_GROUP_ID --protocol tcp --port NEW_PORT_RANGE --cidr NEW_IP_RANGE aws ec2 authorize-security-group-ingress --group-id YOUR_SECURITY_GROUP_ID --protocol udp --port NEW_PORT_RANGE --cidr NEW_IP_RANGE
Ensure the CLI is configured with appropriate permissions to execute these actions.
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