Ensure that IAM Role cannot be assumed by anyone

Risk Level: High
Cloud Entity: IAM Role
CloudGuard Rule ID: D9.CFT.IAM.20
Covered by Spectral: Yes
Category: Security, Identity, & Compliance

GSL LOGIC

AWS_IAM_Role should not have AssumeRolePolicyDocument.Statement contain-any [ Effect='Allow' and Principal.AWS='*' ]

REMEDIATION

From CFT
Set AWS::IAM::Role Principal attribute in AssumeRolePolicyDocument.Statement to a specific service or account. e.g. Service: ec2.amazonaws.com

References

1. https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_use_permissions-to-switch.html
2. https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_compare-resource-policies.html
3. https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_principal.html

IAM Role

An IAM role is similar to a user, in that it is an AWS identity with permission policies that determine what the identity can and cannot do in AWS. However, instead of being uniquely associated with one person, a role is intended to be assumable by anyone who needs it. Also, a role does not have standard long-term credentials (password or access keys) associated with it. Instead, if a user assumes a role, temporary security credentials are created dynamically and provided to the user.

Compliance Frameworks

• AWS CloudFormation ruleset