A vulnerability was discovered in the Crestron AirMedia Windows Application, version 4.3.1.39, in which a low-privileged user can gain a SYSTEM level command prompt by pre-staging a file structure prior to the installation of a trusted service executable and change permissions on that file structure during a repair operation.
https://www.crestron.com/release_notes/airmedia_windows_installer_release_notes_5.5.1.84.pdf