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https://maschell.github.io/homebrew/2020/12/02/failst.html
Dec 2, 2020
In this blog post I want to tell the story about how I found FailST, a way to bypass runtime signature checks for certain titles on the Wii U.
Back in April I started to rewrite some parts of JNUSLib and noticed that some flags in the Filesystem Table were still undocumented. At this point in time I wouldn’t have thought digging into this would lead into a new exploit for the Wii U.
Since the conception of this vulnerability I have shared this with other developers, including Rambo6Glaz/NexoCube, who leaked it. I didn’t intend this to be public until the tools and guides are ready, polished and well tested. It was meant to be released with my new upcoming homebrew environment (including full coldboot features). I will see to that this environment is finished, but for now, here are the details of how the vulnerability works.