Cloud infrastructures are playing an increasingly important role for more and more companies. Furthermore, the degree of interconnection between corporate networks and cloud infrastructures is constantly increasing, but this also harbors dangers: The cloud offers a large, additional attack surface and sometimes complex management mechanisms. Both can be exploited by skilled attackers. In this presentation, Christian Gross, Senior IT Security Analyst at NSIDE Attack Logic GmbH, explains the theory of such attacks and shows one in practice: First, a cloud infrastructure is attacked, and then from there it is successfully jumped over to the domestic corporate network.