Angelos Keromytis Columbia University An End-Point Solution to Zero-Day Worms Abstract -------- I will present a reactive mechanism that protects software services against network worms and other similar malware for which no known fix is available at the time of infection. The system works by automatically patching the vulnerable software. Our preliminary results against worms like Slammer and Blaster indicate an 80% success rate in automatically identifying and fixing the flaw in the source code. I will discuss the design, implementation, experimental evaluation, and limitations of the system, as well as our plans for overcoming these. The system is part of SABER, a survivable services architecture developed at the Network Security Lab at Columbia. For more details, see http://www.cs.columbia.edu/~library/TR-repository/reports/reports-2003/cucs-029-03.pdf