Compute firewall allows open egress Affecting Compute Engine service in Google
Severity Framework
CCSS (Common Configuration Scoring System) is a set of measures used to determine the severity of the rule.
Snyk CCSS
Rule category
Each rule is associated with a high-level category. For example IAM, Container, Monitoring, Logging, Network, etc.
Network/ Ports
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CIS-Controls
- Snyk IDSNYK-CC-00390
- creditSnyk Research Team
Description
Open egress can be used to exfiltrate data to unauthorized destinations, and enable access to potentially malicious resources.
How to fix?
Set destination_ranges attribute to specific net addresses, e.g. 192.168.0.0/16.
Example Configuration
resource "google_compute_firewall" "allowed" {
name = "test-firewall"
network = "test"
destination_ranges = [
"192.168.0.0/16"
]
allow {
protocol = "icmp"
}
}