BSides Leeds 2026 Badge - Firmware Exploration

I attended and spoke at BSides Leeds last weekend and one of the cool things they had was an electronic badge, nothing new as DEF CON have them every other year but still cool to look at. Often during DEF CON I never have a chance to look at the badge because I'm busy working with SOC and helping people enjoy their nights safely. That said, reverse engineering isn't something I do very often but with my RE pipeline being hooked up for CVE hunting and having access to the firmware for the badge I decided to go down a rabbit hole and tear it apart then use the source to match up findings against what I could see in the bin walks.If you want to work out the problems in the badge yourself and don't want it spoiled, look no further into this post because it has a deep code walk of everything that the badge does and what different functions do. The BSides Leeds 2026 badge(helpfully created by Punk Security) is "Artie the Owl": an ATtiny814, eighteen RGB LEDs making up two eyes, and six…