Security News Safari Flaw Can Expose iPhone Users in the EU to Tracking


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Apr 24, 2016
Apple has introduced a new URI scheme in iOS 17.4 to allow EU users to download and install alternative marketplace apps from websites. Once an authorized browser invokes the special URI scheme marketplace-kit, it hands off the installation request to a MarketplaceKit process that starts communicating with the marketplace back-end servers to finally install the app. As part of the installation flow, the MarketplaceKit process sends a unique client_id identifier to the marketplace back-end. Both Safari and the MarketplaceKit process allow any website to make a call to the marketplace-kit URI scheme of a particular marketplace. As a result, multiple websites can trigger the MarketplaceKit process to send the same unique identifier client_id to the same marketplace back-end. This way a malicious marketplace can track users across different websites.


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