Derailed starts with a Ruby on Rails web notes application. I’m able to create notes, and to flag notes for review by an admin. The general user input is relatively locked down as far as cross site scripting, but I’ll find a buffer overflow in the webassembly that puts the username on the page and use that to get a XSS payload overwriting the unfiltered date string. From there, I’ll use the administrator’s browser session to read an admin page with a file read vulnerability where I ca...
