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ELB listener security group is set to TCP all Affecting ELB service in AWS

Severity

0.0
medium
0
10
    Severity Framework
    Snyk CCSS
    Rule category
    Network / Ports

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  • Snyk ID SNYK-CC-00198
  • credit Snyk Research Team
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Description

Elastic Load Balancing security groups should permit access only to necessary ports to prevent access to potentially vulnerable services on other ports.

How to fix?

Ensure that the aws_security_group associated with a load balancer does not have an ingress block that allows access to all TCP ports.

Invalid configurations:

  • ingress.from_port set to 0 and ingress.to_port set to 65535
  • ingress.protocol set to -1

Example Configuration

resource "aws_security_group" "elb-all-valid-elb-group" {
  name = "elb-all-valid-elb-group"
  description = "ELB All TCP Test"

  ingress {
    from_port = 80
    to_port = 80
    protocol = "tcp"
    cidr_blocks = ["192.169.1.1/32"]
  }
}