Description

An AWS Security Group acts as a virtual firewall for your instances to control inbound and outbound traffic. We identified the security group ""{AwsEc2SecurityGroup}"" ({AwsEc2SecurityGroup.GroupId}) is configured to allow inbound access to TCP port 139 and UDP ports 137 and 138 (NetBIOS) from any IP address (0.0.0.0/0 or ::/0).

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  Recommended Mitigation

  Ensure security groups in your account are configured to allow access to TCP port 139 and UDP ports 137 and 138 (NetBIOS) from specific IP addresses only. More details can be found in <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/authorizing-access-to-an-instance.html" target="_blank" rel="noopener noreferrer">https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/authorizing-access-to-an-instance.html</a>