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Compliance · Critical severity

GCP Firewall Rule Allows All Ports

Every port is open to the source range, so any service ever started on this network is exposed by default rather than by decision.

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Google Cloudprovider
Criticalseverity
Compliancewhere it shows up
Manualfix, steps written out

Google Cloud

Found, explained, handed over.

Where the estate departs from your policies, frameworks and tagging rules.

01

Detect

ZopNight checks this automatically across Google Cloud, with read-only access to the account.

02

Explain

Every finding says exactly what to change: Restrict the firewall rule to specific ports.

03

Fix

The finding opens with the fix already written out, step by step, so it is one ticket, not an investigation.

Applies to
VPC Firewall Rules on Google Cloud
The fix, by hand
  1. Cloud Console → VPC Network → Firewall → locate the resource.
  2. Enable firewall rule logging (Edit → Logs → On) and let it run for 24 to 72h.
  3. Use Cloud Logging → resource.type=gce_firewall_rule → analyse which protocols/ports actually receive accepted traffic.
  4. Replace the rule: gcloud compute firewall-rules update ‹name› --rules=tcp:80,tcp:443 (list only the ports observed).
  5. Or split into multiple narrowly scoped rules (one per service). Easier to audit than one large rule.
  6. Delete the original all-ports rule once the replacement is verified.

These are the steps the finding carries in the product.

Category
Compliance. Configuration drift from best practice: public access, missing MFA, unencrypted storage, deprecated runtimes.
Where it appears
The Compliance tab of Recommendations, with every affected resource listed.
Rule ID
RC-135
Full reference

GCP Firewall Rule Allows All Ports

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