This page on the Whonix documentation (and also the advanced deanonymization post) explains “advertisement tracking can link multiple devices via ultrasound covert channels”.
I believe inaudible noise can be used to associate different activities if a participating, malicious vm or external device is listening.
To reduce the risk of this happening, I want to disable the audio output on any vm that I do not plan to use with sound (e.g., vms for writing email, looking at pdfs, asking questions like this).
I can already mute the audio of a vm by:
- clicking the sound icon in the task bar
- clicking “Audio mixer…”
- finding the specific vm under “Playback”
- clicking the mute button for that vm
Is there a command to do this (probably related to pulse audio but I couldn’t find it)?
Also is there a way to automatically apply this at the start of select vms (like disposables)?
Any help would be great. Thank you.