Google Compute Firewall Rules have unnecessary port ranges opened for inbound traffic Affecting Compute Engine service in Google
CCSS (Common Configuration Scoring System) is a set of measures used to determine the severity of the rule.
Each rule is associated with a high-level category. For example IAM, Container, Monitoring, Logging, Network, etc.
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Description
Opening unnecessary port ranges in Compute Engine/GCE Firewall Rules for inbound traffic increases the attack surface and potential risk of unauthorized access. It is important to restrict the range of ports to only those that are required for legitimate traffic to minimize the exposure to potential threats.
How to fix?
Set allow.ports to a specific port number instead of a range of ports where the direction is INGRESS.
Example Configuration
resource "google_compute_network" "default" {
name = "example718"
}
resource "google_compute_firewall" "allowed1" {
name = "example718a1"
network = google_compute_network.default.name
direction = "INGRESS"
allow {
protocol = "tcp"
ports = ["80", "443"]
}
source_ranges = ["192.168.0.0/24"]
}