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The scheme flooding vulnerability allows for third party tracking across different browsers and thus is a violation of privacy.
The vulnerability uses information about installed apps on your computer in order to assign you a permanent unique identifier even if you switch browsers, use incognito mode, or use a VPN. We will be referring to this vulnerability as scheme flooding, as it uses custom URL schemes as an attack vector. The desktop versions of Tor Browser, Safari, Chrome, and Firefox are all affected. In our research into anti-fraud techniques, we have discovered a vulnerability that allows websites to identify users reliably across different desktop browsers and link their identities together. Test the vulnerability on our live demo site.
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To help fix it, we have submitted bug reports to all affected browsers, created a live demo and have made a public source code repository available to all. We believe that vulnerabilities like this one should be discussed in the open to help browsers fix them as quickly as possible. We focus on stopping fraud and support modern privacy trends for removing third-party tracking entirely. Stay tuned to the blog for more on the new Teams client as it rolls out.In this article we introduce a scheme flooding vulnerability, explain how the exploit works across four major desktop browsers and show why it's a threat to anonymous browsing.ĭISCLAIMER: FingerprintJS does not use this vulnerability in our products and does not provide third-party tracking services. Later the enterprise version of teams will move away from Electron to Edge Webview2 This will be Teams consumer and it will be the first client to leverage Edge Webview2.
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Windows 11 / Teams consumer version firstĪt the Windows 11 launch event today we saw that Teams will be integrated into Windows. Microsoft has been pushing Edge WebView2 Runtime on PCs with Microsoft 365 Apps for Enterprise, WebView2 is already leveraged by the Outlook team in OWA Powered Experiences (OPX)
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If an app is written in what is called “Evergreen distribution mode” the WebView2 Runtime is updated automatically so there is no need for the developer to manage it.Īll apps that use the Evergreen distribution mode use a shared copy of the Evergreen WebView2 Runtime, meaning it does not have to be distributed by each app, reducing the app size, meaning a smaller app to download and update. So now Microsoft Teams will be leveraging another Microsoft lead technology, rather than needing to wait on and leverage and integrate Electron, a separate open-source project. Microsoft Edge WebView2 control allows you to embed web technologies (HTML, CSS, and JavaScript) in native apps. This matters a lot less on high-end PC’s with lots of RAM, but as you get to less performance machines with less RAM, for example often the choice in education to hit an aggressive price point, performance can really suffer.īeyond just memory usage there are other benefits to Edge Webview2 What is Edge Webview2?
If other apps or services signal that they require system memory, Chromium gives up memory to those processes. Microsoft even has a Teams documentation page explaining why Microsoft Teams might have high memory use.Įlectron uses Chromium for rendering and Chromium’s behaviour is to detect how much system memory is available and utilizes enough of that memory to optimize the rendering experience. It’s popular with some developers for its flexibility, but it’s also a well-documented memory hog. Electron is a framework for creating desktop applications with web technologies like JavaScript, HTML, and CSS. If you are not interested in the detail, the punchline is Teams is moving to a more performant and more Microsoft controlled technology stack, meaning a better and more performance client experience.