terraform.gcp.security.gcp-compute-template-ip-forward.gcp-compute-template-ip-forward
semgrep
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Ensure that IP forwarding is not enabled on Instances. This lets the instance act as a traffic router and receive traffic not intended for it, which may route traffic through unintended passages.
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Defintion
rules:
- id: gcp-compute-template-ip-forward
patterns:
- pattern: resource
- pattern-inside: |
resource "google_compute_instance_template" "..." {
...
can_ip_forward = true
...
}
message: Ensure that IP forwarding is not enabled on Instances. This lets the
instance act as a traffic router and receive traffic not intended for it,
which may route traffic through unintended passages.
metadata:
owasp:
- A05:2017 - Broken Access Control
- A01:2021 - Broken Access Control
cwe:
- "CWE-284: Improper Access Control"
category: security
references:
- https://www.trendmicro.com/cloudoneconformity/knowledge-base/gcp/ComputeEngine/disable-ip-forwarding.html
technology:
- terraform
- gcp
subcategory:
- audit
likelihood: LOW
impact: LOW
confidence: LOW
license: Commons Clause License Condition v1.0[LGPL-2.1-only]
vulnerability_class:
- Improper Authorization
languages:
- hcl
severity: INFO
Examples
gcp-compute-template-ip-forward.tf
# fail
# ruleid: gcp-compute-template-ip-forward
resource "google_compute_instance_template" "fail" {
name = "test"
source_instance_template = google_compute_instance_template.default.id
can_ip_forward = true
}
# ok: gcp-compute-template-ip-forward
resource "google_compute_instance_template" "success" {
name = "test"
source_instance_template = google_compute_instance_template.default.id
}
# ok: gcp-compute-template-ip-forward
resource "google_compute_instance_template" "success2" {
name = "gke-test"
source_instance_template = google_compute_instance_template.default.id
can_ip_forward = false
}
Short Link: https://sg.run/p1J0