IAM role trust policy should not contain a wildcard principal
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Description
Each IAM role must have a trust policy which defines the principals who are trusted to assume that role. It is possible to specify a wildcard principal which permits any principal, including those outside your organization, the ability to assume the role. It is strongly discouraged to use the wildcard principal in a trust policy unless there is a Condition element to restrict access.
Rationale
A trust policy with a wildcard principal permits any AWS account the ability to assume the role. It is therefore discouraged.
Ensure the identified role does not have a principal value of "AWS": "*". If a wildcard principal is necessary, use a Condition element to restrict access. Follow the AWS documentation to properly scope the Principal policy element.
From the console
- In the AWS Console, navigate to the IAM role you would like to change.
- On the IAM role page, click the Trust relationships tab.
- Click Edit trust policy.
- Make changes to the trust policy to remediate the risk.
- Click Update policy.
From the command line
Use the update-assume-role-policy action to update the role trust policy to remediate the risk.
aws iam update-assume-role-policy
--role-name Test-Role
--policy-document file://<NEW_ROLE_POLICY>.json
