Live data from Hacker News

Don't close your MacBook with a cover over the camera

support.apple.com

691–700 of 990 posts

Re: Don't close your MacBook with a cover over the camera

#691

"might also interfere with the ambient light sensor and prevent features like automatic brightness" Oh, if I could only get automatic brightness to actually turn off!!!! I keep the sensor covered with electrical tape because that's the closest I've been able to get.

https://support.apple.com/guide/mac-help/change-your-display...

Does that preference not work for you?

Re: Don't close your MacBook with a cover over the camera

#692
Hahaha.

My $5k MBP is rocking a 1 cent square cm of black electrical tape which isn't going anywhere. If it leaves adhesive residue, I'll wipe it off with alcohol and replace the tape. My camera is only for stupid zoom meetings, and if I ruin it I get to tell my colleagues my camera is broken. That's a feature, not a bug.

Re: Don't close your MacBook with a cover over the camera

#694
post #429

The light might not make a difference. Wasn't there an NSA tool leaked that would turn on the camera, grab a picture, and have it off again before it would be lit up? It would be technically possible.

Years ago there was an article about 2008 era Mac laptops that could enable their cameras without turning on the LED. I believe the camera firmware was read from RAM on boot. So they just intercepted that. Since then they redesigned the hardware to tie the LED to the sensor camera source. AFAIK Apple hasn't published any official documents on this. I, too, would be curious if it could be hijacked by only taking a still image or modulating the power, but I haven't of anyone actually do this.

Their laptop cameras haven't changed in like a decade. The only change was making it physically thinner to match thinner screens. The image quality actually got a little worse.

Re: Don't close your MacBook with a cover over the camera

#695
post #29

> The camera is engineered so that it can’t activate without the camera indicator light also turning on. This is how you can tell if your camera is on. Is this verifiably true? I trust Apple on security matters more than the average laptop maker, but the fact that so many of these indicator lights are software-controlled erodes my trust in basically all of them.

This [1] is the best source I've seen. 2008 era Mac laptops definitely had that exploit, but since then they've made hardware changes.

> All cameras after that one were different: The hardware team tied the LED to a hardware signal from the sensor: If the (I believe) vertical sync was active, the LED would light up. There is NO firmware control to disable/enable the LED. The actual firmware is indeed flashable, but the part is not a generic part and there are mechanisms in place to verify the image being flashed. […]

[1] https://daringfireball.net/2019/02/on_covering_webcams

Re: Don't close your MacBook with a cover over the camera

#696

Looking at the comments here, I guess I'm the only one who finds sadness that Apple even has to publish this document. Some of those novelty and promotional camera covers are really quite thick. And it just seems like common sense to me that you wouldn't close a laptop with one of those things on. Just like I wouldn't close my laptop with a pen or a ham sandwich tucked into it. But I guess Apple has had enough compla…

This is the one that destroyed the screen on my 16" MBP. 0.023 inches thick. https://www.amazon.com/dp/B07C24NBGL/ref=cm_sw_r_sms_apa_i_T...

They indicated “no thicker than a sheet of paper” and that’s far thicker than a sheet of paper, and incompressible too.

Re: Don't close your MacBook with a cover over the camera

#697
post #23

> "Designed to protect your privacy, Mac notebooks have a camera indicator light to let you know when the camera is on. ... Published Date: July 02, 2020" Perhaps Apple missed these? 2013: iSeeYou: Disabling the MacBook Webcam Indicator LED https://jscholarship.library.jhu.edu/handle/1774.2/36569 2016: Your Mac’s Camera Can Be Hacked https://www.intego.com/mac-security-blog/your-macs-camera-ca... 2016: Former NSA emp…

>2013: iSeeYou: Disabling the MacBook Webcam Indicator LED https://jscholarship.library.jhu.edu/handle/1774.2/36569 ... applies only to older Mac notebooks from like 2008 period which are long since obsolete according to Apple's announced support policy. >2016: Your Mac’s Camera Can Be Hacked https://www.intego.com/mac-security-blog/your-macs-camera-ca... . ... refers specifically the exploit above. >2016: Former NSA…

I have personally turned on the camera without the indicator light coming on on a 2012 Macbook Pro 15" with double-digit percent success rate, meaning someone with more time / expertise could probably do it consistently. I have been unable to do it on newer 15" pros or other models (Air / pro 13").

Re: Don't close your MacBook with a cover over the camera

#699
I have something very similar to these [1] (the original item is no longer listed) on my laptop's webcam and my smartphone's front-facing camera. They've served me very well, and the former has saved me from a potentially-embarrassing conference-call-style disaster.

I really don't get Apple's statement here.

[1] https://www.ebay.co.uk/itm/114090118649

Re: Don't close your MacBook with a cover over the camera

#700
post #169

Earlier quoted context omitted.

The question is whether this is a firmware implementation that's just waiting for a 0-day or if the +V for the CMOS sensor is literally wired to the LED. If the latter I'd like to see a picture of it.

Hi! I was the security architect for this feature on recent Macs. The LED is wired to the camera PMIC and is powered by the voltage rail that powers the camera. The PMIC will always remain on if the system has power. Macs newer than 4 or so years also have a feature that forces the LED to stay lit for at least 3 seconds after it has been turned on to prevent the single-frame-grab attack.

Ah, good. Is the microphone similarly protected? Sometimes I feel I must be the only person on earth who doesn't use their laptop while naked and couldn't care less if the imager was watching me. The microphone, however, could be an actual security threat. Phone calls, muttered passwords, etc.
Post reply on HN