Taking the Surprise out of Changes to a Bro Setup

With network functions virtualization, an organization gains an ability to provide a much more agile security infrastructure. In this paper we focus on vulnerabilities and challenges created by this new flexibility itself. In particular, using Bro as a case study, we present i) a framework for testing Bro scripts using a packet traces, ii) a complementary framework for testing the performance impact of Bro scripts, iii) a continuous integration system for triggering automatic testing in response to code changes. With this system, security administrators are protected against logic errors in new and modified scripts as well as performance degradation.