Risk Level: High
Cloud Entity: Amazon EC2 Instance
CloudGuard Rule ID: D9.AWS.NET.80
Covered by Spectral: No
Instance where isPublic=true and nics contain [ subnet.routeTable.associations length()>0 and subnet.routeTable.routes contain [ destinationCidrBlock='0.0.0.0/0' and gatewayId like 'igw-%' ] ] should not have nics contain [ securityGroups contain [ inboundRules contain [ scope='0.0.0.0/0' and port in($CloudGuard_Known_DB_TCP_Ports) and protocol in('TCP', 'ALL') ] ] ]
- Sign in to the AWS Management Console, and Navigate to EC2 dashboard at https://console.aws.amazon.com/ec2/ .
- In the navigation pane, choose Instances.
- Select your instance and, in bottom half of the screen, choose the Security tab.
- Security groups lists the security groups that are associated with the instance. Inbound rules displays a list of the inbound rules that are in effect for the instance.
- Identify the security group with the scope 0.0.0.0/0 and a Known TCP port from the list in GSL.
- On the Edit inbound rules page, modify the traffic source that allow traffic from 0.0.0.0/0 to one of the port from the list.
- Select My IP from the Source dropdown list to allow inbound traffic only from your machine or Select Custom from the Source dropdown list and enter appropriate range of IPs.
- Click Save to apply the changes.
From Command Line
- Identify the security group associated with the instance.Remove the rule which has ingress is 0.0.0.0/0 to one of the from the GSL list.
aws ec2 revoke-security-group-ingress --region REGION --group-name GROUP_NAME --protocol tcp --port PORT_NUMBER --cidr 0.0.0.0/0
- Now add the inbound rules with different parameters, Modify the CIDR_BLOCK to appropriate range in order to restrict access from 0.0.0/0 to one of the port from the list.
aws ec2 authorize-security-group-ingress --region REGION --group-name GROUP_NAME --protocol PROTOCOL --port PORT --cidr CIDR_BLOCK
Use the link to the Cloudformation resource from the references.
Use the link to the terraform resource from the references.
Amazon Elastic Compute Cloud (Amazon EC2) is a web service that provides secure, resizable compute capacity in the cloud. It is designed to make web-scale cloud computing easier for developers.
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Updated 4 days ago