Detections
Analytics
1.5 Ensure that Service Account has no Admin privileges
Warning! Audit Deprecated
This audit has been deprecated and will be removed in a future update.
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A service account is a special Google account that belongs to an application or a VM, instead of to an individual end-user. The application uses the service account to call the service's Google API so that users aren't directly involved. It's recommended not to use admin access for ServiceAccount.Rationale:
Service accounts represent service-level security of the Resources (application or a VM) which can be determined by the roles assigned to it. Enrolling ServiceAccount with Admin rights gives full access to an assigned application or a VM. A ServiceAccount Access holder can perform critical actions like delete, update change settings, etc. without user intervention. For this reason, it's recommended that service accounts not have Admin rights.
Impact:
Removing *Admin or *adminorEditororOwner' role assignments from service accounts may break functionality that uses impacted service accounts. Required role(s) should be assigned to impacted service accounts in order to restore broken functionalities.
Solution
From ConsoleGo to IAM & admin/IAM using https://console.cloud.google.com/iam-admin/iam
Go to the Members
Identify User-Managed user created service account with roles containing *Admin or *admin or role matching Editor or role matching Owner
Click the Delete bin icon to remove the role from the member (service account in this case)
From Command Line:
gcloud projects get-iam-policy PROJECT_ID --format json > iam.json
Using a text editor, Remove Role which contains roles/*Admin or roles/*admin or matched roles/editor or matches 'roles/owner'. Add a role to the bindings array that defines the group members and the role for those members.
For example, to grant the role roles/appengine.appViewer to the ServiceAccount which is roles/editor, you would change the example shown below as follows:
{
'bindings': [
{
'members': [
'serviceAccount:[email protected]',
],
'role': 'roles/appengine.appViewer'
},
{
'members': [
'user:[email protected]'
],
'role': 'roles/owner'
},
{
'members': [
'serviceAccount:[email protected]',
'serviceAccount:[email protected]'
],
'role': 'roles/editor'
}
],
'etag': 'BwUjMhCsNvY='
}
Update the project's IAM policy:
gcloud projects set-iam-policy PROJECT_ID iam.json
Default Value:
User Managed (and not user-created) default service accounts have the Editor (roles/editor) role assigned to them to support GCP services they offer.
By default, there are no roles assigned to User Managed User created service accounts.
See Also
Item Details
Audit Name: CIS Google Cloud Platform v1.1.0 L1
References: CSCv7|16
Plugin: GCP
Control ID: 13a039ac897596bf9edc09a36b44660d54f1e24d2dfe5e4528dea9515ee8392f