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Security researchers warn against apps with built-in browsers

Security researchers warn against apps with built-in browsers

Many mobile apps have a built-in browser to allow users to stay in the app when they click links, or do something that requires an Internet connection (for example, logging into an account). Twitter, Instagram, and Tiktok are just three examples of popular apps with a built-in browser.

What most people probably don’t know is that many of these built-in browsers don’t work in the same way as the standard browser on iOS or Android. Namely, they can insert additional javascript code into all pages loaded.

Security researcher and developer Felix Krause (Follow-up article with more information over here) developed a tool that can detect this injected code, and also showed how many common applications of this technology are used.

Instagram on iOS, for example, adds a code that tracks whether you’re highlighting text on a page, and adds a script that checks if users allow tracking on pages that don’t already have it. Even on Android, it does the latter. Tiktok on IOS is worse: the app monitors all text input and also doesn’t have a shortcut to open the page in your default browser instead.

Some apps that have a built-in iOS browser use Safari as an intermediary and don’t have the ability to enter code in this way. This applies, for example, to Twitter, Reddit, Whatsapp and Youtube.

Felix Krause’s tip is to always click the button to open external links in the phone’s default browser rather than the in-app browser. You can test for yourself whether the app you are using is injecting code by visiting inappbrowser.com Via the native browser, but Felix Krause warns that there is a way for apps to hide injected JavaScript code in iOS.

See also  Eight minutes of Dead Space. Remake then.

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