From small business to large enterprise, VOIP phones can be found on nearly every desk. But how secure are they? What if your phone was spying on every conversation you have?

This talk is an introduction to hardware hacking and as a case study I'll use the [REDACTED] Deskphone, a device frequently deployed in corporate environments. I'll use it to introduce the tools and methodology needed to answer these questions.

During this talk, attendees will get a close up look at the operations of a hardware hacker, including ARM disassembly, firmware extraction using binwalk, microsoldering to patch an EEPROM and get a root shell over UART, and ultimately uncover an already known decadeold bug that somehow remained unnoticed in the device's firmware.

Beyond the case study I will also address alternative tactics; some did not work, others may have but were not the lowesthanging fruit. When it comes to hardware hacking, the process is as important as the result; knowing that there are multiple ways to reach the end goal helps researchers remain confident when hurdles arise. After the talk, attendees will have an increased distrust towards alwayson devices; however, they will have the background knowledge to investigate the products and systems they encounter daily.

Intro to Embedded HackingHow you too can find a decade old bug in widely deployed devices. [REDACTED] Deskphones, a case study.