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Explore a detailed security analysis of Google's Quick Share (formerly Nearby Share) file sharing protocol in this DEF CON 32 conference presentation. Discover how researchers uncovered 10 critical vulnerabilities across Windows and Android implementations through protocol analysis, custom tool development, and fuzzing techniques. Learn about the QuickShell RCE attack chain that combines 5 distinct vulnerabilities, enabling remote code execution on Windows systems. Gain insights into the Protobuf-based protocol structure, novel HTTPS MITM techniques, and various security flaws that allow unauthorized file writing, application crashes, traffic redirection, and path traversal attacks. Understand the progression from initial fuzzing attempts that found non-exploitable crashes to the discovery of significant logical vulnerabilities in both desktop and mobile platforms.
