KMS key policy should not allow everyone to use it

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Description

KMS keys are assigned a resource-based policy that controls who can use and manage the key.

Rationale

When the key policy is misconfigured, it can allow any unauthenticated user with knowledge of the key ID to use it for encryption, decryption, signing and verification purposes.

Remediation

From the console

Go to the list of customer-managed KMS keys at https://console.aws.amazon.com/kms/home#/kms/keys.
Click the vulnerable KMS key name.
In the Key Policy tab, remove the statement making the key publicly accessible.

From the command line

Retrieve the current key policy:

aws kms get-key-policy \
   --key-id <KEY_ARN> \
   --policy-name default \
   --query Policy --output text > key_policy.json

Remove the statement making the key publicly accessible, then update the key policy:

aws kms put-key-policy \
   --key-id <KEY_ARN> \
   --policy-name default \
   --policy file://./key_policy.json

References

[https://docs.aws.amazon.com/kms/latest/developerguide/key-policies.html]
[https://docs.aws.amazon.com/IAM/latest/UserGuide/access-analyzer-resources.html#access-analyzer-kms-key]