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Lec02b - COMP7370 Advanced Computer and Network Security...

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COMP7370 Advanced Computer and Network Security Cold Boot Attacks on Encryption Keys (2) Topics: Imaging Residual Memory Key reconstruction Identifying keys in memory Topic 1: Imaging Residual Memory 1. Memory Wiping Can wiping memory at POST (Power-On Self Test) solve the memory attacking problem? Attackers can transfer memory data to a machine that does not wipe its memory on boot. 2. Imaging tools Challenging: booting a system can overwrite some portions of memory Load a full OS? Why not? Very destructive Solution: tiny special purpose program (trivial amounts of RAM) PXE Network boot Laptop --------------------> (PXE) target PC UDP(enthernet) <---- memory image ---- (30 sec. for 1GB RAM data) Boot from USB drives Flash device(10KB SYSLINUX bootloader) ----------------> (USB) target PC <----- memory image ---- EFI boot – Extensible firmware interface instead of BIOS iPods <---- imaging tools 3. Imaging attacks Approach 1: Simple reboot: change BIOS; boot the imaging tool o Warm boot? OS restart: software will have an opportunity to wipe
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