📝 Google KMS Crypto Key is anonymously or publicly accessible 🟠🟢

• Contextual name: 📝 Crypto Key is anonymously or publicly accessible 🟠🟢
• ID: /ce/ca/google/kms/kms-cryptokey-access
• Located in: 📁 Google KMS

Flags

• 🟢 Impossible policy
• 🟢 Policy with categories
• 🟠 Policy with internal.md
• 🟢 Policy with type

Our Metadata

• Policy Type: COMPLIANCE_POLICY
• Policy Category:
  • SECURITY

Similar Policies

• Cloud Conformity
  • Check for Publicly Accessible Cloud KMS Keys

Internal Notes 🟠

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Relationship type: many-to-many

IAM Policy Binding.Name = CryptoKey.CA10__name__c

We cannot do this check automatically.

1. List all Cloud KMS Cryptokeys.

    gcloud kms keys list --keyring=[key_ring_name] --location=global --format=json | jq '.[].name'

2. Remove IAM policy binding for a KMS key to remove access to allUsers and allAuthenticatedUsers using the below command.

    gcloud kms keys remove-iam-policy-binding [key_name] --keyring=[key_ring_name] --location=global --member='allAuthenticatedUsers' --role='[role]' gcloud kms keys remove-iam-policy-binding [key_name] --keyring=[key_ring_name] --location=global --member='allUsers' --role='[role]'

Description

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Description

It is recommended that the IAM policy on Cloud KMS cryptokeys should restrict anonymous and/or public access.

Rationale

Granting permissions to allUsers or allAuthenticatedUsers allows anyone to access the dataset. Such access might not be desirable if sensitive data is stored at the location. In this case, ensure that anonymous and/or public access to a Cloud KMS cryptokey is not allowed.

Impact

Removing the binding for allUsers and allAuthenticatedUsers members denies accessing cryptokeys to anonymous or public users.

Audit

From Google Cloud CLI

1. List all Cloud KMS Cryptokeys.

   gcloud kms keys list --keyring=[key_ring_name] --location=global --format=json | jq '.[].name'

2. Ensure the below command's output does not contain allUsers or allAuthenticatedUsers.

   gcloud kms keys get-iam-policy [key_name] --keyring=[key_ring_name] --location=global --format=json | jq '.bindings[].members[]'

Default Value

By default Cloud KMS does not allow access to allUsers or allAuthenticatedUsers.

... see more

Remediation

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Remediation

From Google Cloud CLI

1. List all Cloud KMS Cryptokeys.

   gcloud kms keys list --keyring=[key_ring_name] --location=global --format=json | jq '.[].name'

2. Remove IAM policy binding for a KMS key to remove access to allUsers and allAuthenticatedUsers using the below command.

   gcloud kms keys remove-iam-policy-binding [key_name] --keyring=[key_ring_name] --location=global --member='allAuthenticatedUsers' --role='[role]'

   gcloud kms keys remove-iam-policy-binding [key_name] --keyring=[key_ring_name] --location=global --member='allUsers' --role='[role]'

policy.yaml

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Linked Framework Sections

Section	Sub Sections	Internal Rules	Policies	Flags
💼 CIS GCP v3.0.0 → 💼 1.9 Ensure That Cloud KMS Cryptokeys Are Not Anonymously or Publicly Accessible - Level 1 (Automated)			1
💼 Cloudaware Framework → 💼 Public and Anonymous Access			24