The sixth generation (6G) of networks is supported by increased bandwidth, automation through the use of O-RAN technologies. Simultaneously though autonomous operation leads to an extensive threat surface and sophisticated attacks. Understanding the attack impact, the Tactics, Techniques and Procedures that are used by attackers is extremely challenging, but however is crucial for developing defense and mitigation strategies against them. This paper evaluates a targeted attack chain against a virtualized, 6G-oriented O-RAN testbed in which the F1 midhaul interface is accessible to an attacker and transport-layer protection is not enabled. The attack disrupts the legitimate O-DU association, introduces a rogue O-DU using observed configuration parameters, and intercepts user-plane traffic. The attack was evaluated in a fully virtualized testbed based on Open5GS, the srsRAN Project, FlexRIC, and an Electric Vehicle (EV) charging infrastructure based on OCPP 1.6.

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