Ensure AWS Load Balancer is using TLS 1.2

Error: AWS Load Balancer is not using TLS 1.2

Bridgecrew Policy ID: BC_AWS_GENERAL_43
Checkov Check ID: CKV_AWS_103
Severity: HIGH

AWS Load Balancer is not using TLS 1.2

Description

A listener in an AWS Load Balancer is a process that checks for connection requests. Users can define a listener when creating a load balancer, and add listeners to the load balancer at any time. The HTTPS listener enables traffic encryption between your load balancer and the clients that initiate SSL or TLS sessions.

Fix - Runtime

AWS Console

  1. Go to the Amazon EC2 console at https://console.aws.amazon.com/ec2/.
  2. On the navigation pane, under LOAD BALANCING, select Load Balancers.
  3. Select the load balancer and choose Listeners.
    4.Select the check box for the TLS listener and choose Edit.
  4. For Security policy, choose a security policy.

CLI Command

modify-listener
--listener-arn <value>
[--port <value>]
[--protocol <value>]
[--ssl-policy <value>]

Fix - Buildtime

Terraform

Resource: aws_lb_listener
Attribute: protocol - (Optional) The protocol for connections from clients to the load balancer. For Application Load Balancers, valid values are HTTP and HTTPS, with a default of HTTP. For Network Load Balancers, valid values are TCP, TLS, UDP, and TCP_UDP. Not valid to use UDP or TCP_UDP if dual-stack mode is enabled. Not valid for Gateway Load Balancers.

resource "aws_lb_listener" "front_end" {
  load_balancer_arn = aws_lb.front_end.arn
  port              = "443"
  protocol          = "HTTPS"
  + ssl_policy        = "ELBSecurityPolicy-TLS-1-2-2017-01"
  certificate_arn   = "arn:aws:acm:eu-west-2:999999999:certificate/77777777-5d4a-457f-8888-02550c8c9244"

  default_action {
    type             = "forward"
    target_group_arn = aws_lb_target_group.front_end.arn
  }
}

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