An ingress security group rule allows traffic from /0.

Explanation

Opening up ports to the public internet is generally to be avoided. You should restrict access to IP addresses or ranges that explicitly require it where possible.

Possible Impact

Your port exposed to the internet

Suggested Resolution

Set a more restrictive cidr range

Insecure Example

The following example will fail the aws-vpc-no-public-ingress-sgr check.

resource "aws_security_group_rule" "bad_example" {
	type = "ingress"
	cidr_blocks = ["0.0.0.0/0"]
}

Secure Example

The following example will pass the aws-vpc-no-public-ingress-sgr check.

resource "aws_security_group_rule" "good_example" {
	type = "ingress"
	cidr_blocks = ["10.0.0.0/16"]
}

Getting Started
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