STUN - i.e., Session Traversal Utilities for NAT - is a tool used to retrieve the public IP address and port number of a networked computer situated behind a NAT. The vulnerability unearthed by FingerprintJS has to do with a specific candidate dubbed "Server Reflexive Candidate" that's generated by a STUN server when data from the endpoint needs to be transmitted around a NAT (Network Address Translator). This real-time media exchange between two endpoints is established through a discovery and negotiation process called signaling that involves the use of a framework named Interactive Connectivity Establishment (ICE), which details the methods (aka candidates) that can be used by the two peers to find and establish a connection with one another, irrespective of the network topology. WebRTC, short for Web Real-Time Communication, is an open-source initiative aimed at providing web browsers and mobile applications with real-time communication via APIs that enable peer-to-peer audio and video communication without the need for installing dedicated plugins or apps. NOTE : You can also choose to Use designated ports if you know which ports to select. Under Access, make sure that Incoming and outgoing is selected, then change the type from default to Open to all devices. "Nevertheless, you can get the real client's IP through WebRTC." Click Browse and locate the app you want to add. "If you read the IP address from an HTTP request received by your server, you'll get the IP address of the egress proxy," FingerprintJS researcher Sergey Mostsevenko said. However, the feature is available only to iCloud+ subscribers running iOS 15 or macOS 12 Monterey and above.
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