VMware Workstation 8.x before 8.0.5 and VMware Player 4.x before 4.0.5 on Windows use weak permissions for unspecified process threads, which allows host OS users to gain host OS privileges via a crafted application.
VMware ESXi 3.5, 4.0, and 4.1 and ESX 3.5, 4.0, and 4.1 do not properly implement port-based I/O operations, which allows guest OS users to gain guest OS privileges by overwriting memory locations in a read-only memory block associated with the Virtual DOS Machine.