Intercepting iCloud Keychain
Explore a critical cryptographic implementation flaw discovered in iCloud Keychain's end-to-end encryption system during this 25-minute Black Hat conference talk. Delve into the potential for sophisticated attackers with privileged access to iCloud communications to man-in-the-middle iCloud Keychain Sync and gain plaintext access to secrets. Examine the components of iCloud Keychain, the Circle Protocol, and the process of secret syncing and recovery in the cloud. Investigate the uncovered vulnerabilities, including CVE-2017-2448, and their impact on Apple's security goals. Learn about the OTR flaws, signature bypass attack, and stack overlap attack. Conclude with a discussion on the implications for the security industry and potential next steps.