Betriebssysteme · Institut für Systemarchitektur · Fakultät Informatik · TU Dresden

09. 01. 2015

Detecting Attacks Using Program Alternatives and ELKVM

Marta Tasic

TU Dresden

Verteidigung der Master-Arbeit

Buffer overflow is known to be the most common form of vulnerability in software that allows attackers to hijack a system by feeding a specially crafted input to a vulnerable application running on it. Many techniques have been developed to prevent an intrusion, but none of them provide an ultimate solution. Multi-variant execution involves running several slightly different versions of a program in parallel. Discrepancies in execution of the variants indicate an attack. I develop a multi-variant execution environment with the help of ELKVM library. I implement a multi-variant execution monitor which produces variants for a given application using custom program diversification techniques and runs them while comparing their behavior. The monitor runs as a Linux user-space application. It provides security to the application against many buffer overflow based attacks with the geometric-mean performance degradation of 18.2%, commonly affordable to security sensitive applications.
16. Jan 2018
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