Race condition in Login Window in Apple Mac OS X 10.6.x before 10.6.2, when at least one account has a blank password, allows attackers to bypass password authentication and obtain login access to an arbitrary account via unspecified vectors.
Concurrent Execution using Shared Resource with Improper Synchronization The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.