A security vulnerability was reported to Google on April 10, 2017 which allows an attacker to record audio or video using Chrome without indication.
Most modern web browsers support WebRTC (Web Real-Time Communications). One of the benefits of WebRTC is that it supports real-time communication without the use of plugins. This includes options to create audio and video chat services, p2p data sharing, screen sharing, and more using the technology.
A proof of concept was created which you find linked on the Chromium Bugs website. All you need to do is click on two buttons, and allow the site to use WebRTC in the web browser. The proof of concept demo records audio for 20 seconds, and gives you an option afterwards to download the recording to the local system.
A Chromium team member confirmed the existence of the issue, but did not want to call it vulnerability.
This isn't really a security vulnerability - for example, WebRTC on a mobile device shows no indicator at all in the browser. The dot is a best-first effort that only works on desktop when we have chrome UI space available.
The explanation does not make a whole lot of sense to me. Because Android does not show an indicator in first place, and Chrome on the desktop only if enough interface space is available, it is not a security vulnerability? At the very least, it is a privacy issue and something that users need to be aware of.
While users do have to trust sites enough to give them permissions to use WebRTC, it and the fact that the site needs to launch a popup window are the only things needed to exploit this.
Google may improve the situation in the future, but users are on their own right now when it comes to that.
The best form of protection is to disable WebRTC which can be done easily if you don't require it, the second best to allow only trusted sites to use WebRTC. If you allow a site to use WebRTC, you may want to look out for any other windows that it may spawn afterwards on top of that.
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