A rogue Velociraptor client can upload a malformed sparse file such that if the GUI attempts to expand the file, a panic occurs which may crash the server process.
The problem is a Divide by Zero bug in the ShouldPadFile() function.
The attacker needs to obtain deployment credentials to be able to start a rogue client and upload a specially crafted sparse file.To successfully crash the server the Velociraptor user needs to export the file using the "Expand Sparse Files" option. If the option is not used the crash is not triggered.
Usually the server will restart after the crash. The user should then export the file without the "Expand Sparse Files" option.