Public Instance with service 'DNS' (UDP:53) is exposed to the entire internet
Services and databases store data that may be sensitive, protected by law, subject to regulatory requirements or compliance standards. It is highly recommended that access to data will be restricted to encrypted protocols. This rule detects network settings that may expose data via unencrypted protocol over the public internet or to a too wide local scope.
Risk Level: High
Cloud Entity: Amazon EC2 Instance
CloudGuard Rule ID: D9.AWS.NET.AG2.8.Instance.53.UDP
Covered by Spectral: No
Category: Compute
GSL LOGIC
Instance where isPublic=true and nics contain [ subnet.routeTable.associations length()>0 ] and nics contain [ subnet.routeTable.routes contain [ destinationCidrBlock='0.0.0.0/0' and gatewayId regexMatch /gw/ ] ] should not have inboundRules contain [ port<=53 and portTo>=53 and protocol in ('UDP', 'ALL') and scope isPublic() and scope='0.0.0.0/0']
REMEDIATION
Limit the access scope for Instance with service 'DNS to only allow access in internal networks and limited scope.
If public interface exists, remove it and limit the access scope within the VPC only to applications or instances that requires access.
Amazon Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/authorizing-access-to-an-instance.html
As a further protection step, Use CloudGuard 'Tamper Protection' (Full Protection mode) and region lock to prevent unauthorized changes to network access settings, refer to https://sc1.checkpoint.com/documents/CloudGuard_Dome9/Documentation/Network-Security/DynAccessLease.html?Highlight=dynamic%20access for more details.
Amazon EC2 Instance
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.
Compliance Frameworks
- BP-0318
- ERM
- LGPD
- NETWSEC-V2
- SERM
Updated about 1 year ago