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Vulnerability in the Mac Zoom client allows malicious websites to enable camera

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271–280 of 473 posts

Re: Vulnerability in the Mac Zoom client allows malicious websites to enable camera

#271
post #266

Well, the company and product are dead to me now, gonna hassle our CTO to switch. I just really hope theres some dev at Zoom who hated this whole installing backdoors idea who's gonna have the greatest "I told you so" day at the office tomorrow.

We work with a lot of hospitals and find that video conferencing tools are often blocked by their IT departments for security reasons. I’m expecting Zoom to find itself on that list in short order.

Re: Vulnerability in the Mac Zoom client allows malicious websites to enable camera

#273

Click on the app icon, hold, move to Trash.

It is mentioned in the third paragraph already, highlighted in green. They don't offer a method of clean removal to their users. They run a web server on your machine that will reinstall Zoom on your macOS whenever it is convenient for them (secretly, without asking you first). See here: https://apple.stackexchange.com/questions/358651/unable-to-c... That web server is exploitable, as explained in the article. Note t…

Now, notwithstanding what I posted above, THIS is fucked up and inexcusable.

Re: Vulnerability in the Mac Zoom client allows malicious websites to enable camera

#274
post #268

Earlier quoted context omitted.

It's mentioned in the article. After uninstalling the main application, you also have to kill the helper app named ZoomOpener. The article gives some Terminal commands to do this, but you should be able to find it in Activity Monitor if your more comfortable there. Once you kill ZoomOpener, remove it from the list of Login Items in System Preferences -> Users & Groups. Lastly delete the folder called .zoomus from you…

Now go explain that to the folks in Marketing.

The folks in Marketing have folks in IT to do this for them.

Re: Vulnerability in the Mac Zoom client allows malicious websites to enable camera

#275

Earlier quoted context omitted.

RingCentral Meetings uses zoom.us engine but the local server runs on port 19424 instead. I'm able to replicate the issue on it. PoC: http://localhost:19424/launch?action=join&confno=3535353535

In my case it's 19421 as written in the article.

For RingCentral or Zoom? Could be because I have both on my machine.

Re: Vulnerability in the Mac Zoom client allows malicious websites to enable camera

#276

I've lost all trust in Zoom at this point

(prior reply deleted once I read about the fucking local webserver & phantom reinstallation bullshit. Fuck zoom.)

> the Zoom client starts up. It'd be hard to miss

They already have you on video at that point. The summary above is very fair, there's no point trying to throw more PR at this problem. Ignoring other issues and focusing on the main point: They need to increase security by a huge amount by implementing a simple dialog with "Yes" not selected as default. They also need to communicate why they did this to their users and be honest.

Re: Vulnerability in the Mac Zoom client allows malicious websites to enable camera

#277

I've lost all trust in Zoom at this point

(prior reply deleted once I read about the fucking local webserver & phantom reinstallation bullshit. Fuck zoom.)

> But insisting Zoom change the software because it's possible some doofus might be duped into joining a meeting with someone is kinda ridiculous, IMO.

In my experience (the energy sector), most of the people I interact with on Zoom would definitely fall for joining some random meeting that popped up. They are incredibly good at their field of expertise, but certainly doofuses when it comes to knowing how to click on things in zoom.

Re: Vulnerability in the Mac Zoom client allows malicious websites to enable camera

#278

Zoom’s response to this[1] is a wonderful example of how not to respond to security issues. It includes the classic tropes: * Our users don’t care about security. > Our video-first platform is a key benefit to our users around the world, and our customers have told us that they choose Zoom for our frictionless video communications experience. * We have no way of knowing if this has been exploited in the wild, so it’s…

> All first-time Zoom users, upon joining their first meeting from a given device, are asked whether they would like their video to be turned OFF. For subsequent meetings, users can configure their client video settings to turn OFF video when joining a meeting. > Additionally, system administrators can pre-configure video settings for supported devices at the time of install or change the configuration at anytime.

TBH, they're not as dismissive as you're sounding them to be

Re: Vulnerability in the Mac Zoom client allows malicious websites to enable camera

#279
post #45
post #38

How do you recommend uninstalling this?

From the article: > To shut down the web server, run lsof -i :19421 to get the PID of the process, then do kill -9 [process number]. Then you can delete the ~/.zoomus directory to remove the web server application files. > To prevent this server from being restored after updates you can execute the following in your terminal: rm -rf ~/.zoomus touch ~/.zoomus

note the last part where the directory is removed (~/.zoomus) and touch creates a file ~/.zoomus. I am assuming a re-install will fail because it cannot create a directory again when there is already an existing file.

My guess is that if sometime in the future you want to use zoom again, the install will fail until you remove the file ~/.zoom

Re: Vulnerability in the Mac Zoom client allows malicious websites to enable camera

#280
post #248
post #244

Earlier quoted context omitted.

You might be able to remove this with https://github.com/Lord-Kamina/SwiftDefaultApps

I’ve opted to remove Zoom instead.

Yep, they have lost my trust too, especially with their terrible response on the blog. And I don't trust that they simply won't remove my mitigations if I have that app on my system again.
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