CIS GCP 7.1 (Ensure KMS encryption keys are rotated within 90 days) requires: Customer-managed encryption keys (CMEK) should be rotated at least every 90 days. This is a medium-severity control.

How does EchelonGraph detect CIS GCP 7.1 violations?

EchelonGraph automatically detects CIS GCP 7.1 violations using scanner rule GCP-KMS-001. The scanner checks cloud infrastructure configurations in real-time and flags non-compliant resources.

What audit questions are asked for CIS GCP 7.1?

What is the rotation period for each KMS key? Are there any keys without automatic rotation configured? What is your process for manually rotating keys? How do you handle key destruction and retain access to old data?

🔷CIS GCP 7.1Rule: GCP-KMS-001medium

Ensure KMS encryption keys are rotated within 90 days

Description

Customer-managed encryption keys (CMEK) should be rotated at least every 90 days.

⚠️ Risk Impact

Long-lived encryption keys increase the risk of key compromise. Regular rotation limits the amount of data encrypted with any single key version.

🔍 How EchelonGraph Detects This

GCP-KMS-001Automated scanner rule

EchelonGraph's Tier 1 Cloud Scanner automatically checks for this condition across all connected Google Cloud accounts. Violations are flagged as medium-severity findings with remediation guidance.

🖥️ Manual Verification

terminal

gcloud kms keys list --location=LOCATION --keyring=KEYRING --format='table(name,rotationPeriod,nextRotationTime)'

🔧 Remediation

Set automatic rotation: gcloud kms keys update KEY --location=LOCATION --keyring=KEYRING --rotation-period=7776000s --next-rotation-time=TIMESTAMP

💀 Real-World Attack Scenario

A key management admin's credentials were compromised. The attacker exported the CMEK key material (which had not been rotated in 14 months) and used it to decrypt intercepted storage data offline. Because the same key version encrypted 14 months of data, the entire dataset was compromised.

💰 Cost of Non-Compliance

PCI DSS Requirement 3.6.4 mandates key rotation. Non-compliance fines: $5K-$100K/month. Compromised encryption keys expose all data encrypted under that key version — average exposure cost: $3.2M.

📋 Audit Questions

1.What is the rotation period for each KMS key?
2.Are there any keys without automatic rotation configured?
3.What is your process for manually rotating keys?
4.How do you handle key destruction and retain access to old data?

🎯 MITRE ATT&CK Mapping

T1552.004 — Private KeysT1588.004 — Digital Certificates

🏗️ Infrastructure as Code Fix

main.tf

resource "google_kms_crypto_key" "key" {
  name            = "app-encryption-key"
  key_ring        = google_kms_key_ring.keyring.id
  rotation_period = "7776000s"  # 90 days
  lifecycle {
    prevent_destroy = true
  }
}

⚡ Common Pitfalls

⛔Setting rotation period but not the next rotation time, meaning rotation never starts
⛔Rotating keys but not re-encrypting data encrypted with old versions
⛔Using asymmetric keys where automatic rotation is not supported without additional procedures

📈 Business Value

Regular key rotation limits the blast radius of key compromise and satisfies PCI DSS, HIPAA, and ISO 27001 requirements. It's essential for maintaining data confidentiality over time.

⏱️ Effort Estimate

Manual

1-2 hours to configure rotation per key ring

With EchelonGraph

EchelonGraph monitors key rotation compliance across all key rings

🔗 Cross-Framework References

SOC2-CC6.1ISO27001-A.10.1.2PCI-3.6.4

Automate CIS GCP 7.1 compliance

EchelonGraph continuously monitors this control across all your cloud accounts.

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