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Contents
Reducing the Effective Entropy of GS Cookies
3/2007
skape
mmiller@hick.org
Contents
Foreword
Introduction
Implementation
Cookie Generation
Prologue Modifications
Epilogue Modifications
Attacking GS
Calculating Entropy Sources
System Time
Process and Thread Identifier
Tick Count
Performance Counter
Frame Pointer
Predictability of Entropy Sources in Boot Start Services
Experimental Results
System Time
Process and Thread Identifier
Tick Count
Performance Counter
Cookie
Improvements
Better Entropy Sources
Seeding High Order Bits
External Cookie Generation
Future Work
Improving Performance Counter Estimates
Remote Attacks
Conclusion
Bibliography
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