HTTP! Encrypted! Information can be! Stolen through! TCP-windows by! Mathy Vanhoef & Tom Van Goethem HEIST Agenda • Technical background! • Same-Origin Policy! • Compression-based attacks! • SSL/TLS & TCP! • Nitty gritty HEIST details! • Demo! • Countermeasures 2 HEIST Same-Origin Policy 3 Mr. Sniffles https://bunnehbank.com GET /vault HEIST Same-Origin Policy 3 Mr. Sniffles https://bunnehbank.com