One issue that jumped out at the researchers: The DTEN system stored notes and annotations written through the whiteboard feature in an Amazon Web Services bucket that was exposed on the open internet. A few weeks later, the company also fixed a similar whiteboard PDF access issue that would have allowed anyone on a company’s network to access all of its stored whiteboard data. The researchers also discovered two ways that an attacker on the same network as DTEN devices could manipulate the video conferencing units to monitor all video and audio feeds and, in one case, to take full control.