Linux security

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Turning camera off

Hackers gain access to their victims’ computers with remote-access Trojans (RATs) – malware that gives an intruder administrative control over its targeted computers, including, in this case, the ability to remotely control webcams. It’s an invisibly-installed malware program spread via email attachment or by tricking victims into visiting a booby-trapped site.

Tape the camera. It may even be possible to turn it off in BIOS (depending on your version). Better yet, if you know what driver module is controlling the webcam, you can disable the driver with modprobe -r. Check with:

$ lsmod | grep "uvc"

If stuff like this appears, your webcam device uses an uvc driver:

uvcvideo               79005  0 
videobuf2_vmalloc      12816  1 uvcvideo
videobuf2_core         47787  1 uvcvideo
videodev              126451  3 uvcvideo,v4l2_common,videobuf2_core
media                  18305  2 uvcvideo,videodev
usbcore               195340  7 uvcvideo,ums_realtek,usb_storage,ehci_hcd,ehci_pci,usbhid,xhci_hcd

To disable the cam:

$ sudo modprobe -r uvcvideo

To enable the cam:

$ sudo modprobe uvcvideo

If not an uvcvideo driver, try $ sudo lsmod | grep "video" and use the modinfo command to find out more about a particular module:

$ sudo modinfo [modulename]

Then replace the "uvcvideo" in the above modprobe command with the name of your driver module.

To disable the webcam at boot (if file not exists, create it):

$ sudo geany /etc/modprobe.d/blacklist.conf

At bottom of the file add this line: blacklist uvcvideo (or the name of your driver instead of "uvcvideo").

Save the file and reboot. Your webcam is no longer functioning.

Turning microphone off

Open the alsa control panel for muting the microphone:

$ sudo alsamixer

You can also use the same modprobe enabling/disabling method as used above for webcam. This page may be helpful for finding your driver: http://alsa.opensrc.org/ALSA_modules.

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