GHSA-4427-7f3w-mqv6 OpenStack Keystone V3 /credentials endpoint policy logic allows to change credentials owner or target project ID

• PyPI keystone: < 15.0.1 → fixed in 15.0.1 • PyPI keystone: >= 16.0.0, < 16.0.1 → fixed in 16.0.1

An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0. Any authenticated user can create an EC2 credential for themselves for a project that they have a specified role on, and then perform an update to the credential user and project, allowing them to masquerade as another user. This potentially allows a malicious user to act as the admin on a project another user has the admin role on, which can effectively grant that user global admin privileges.