So I started by researching what kinds of data the Trivia Crack client and server pass back and forth. I suspected I might be able to take advantage of sending my own requests to Trivia Crack’s servers, or using some data in the responses from Trivia Crack’s servers, to gain an edge in the game. While I’m not so good at random trivia, I am pretty good at reverse-engineering.

1) Finding the vulnerabilityĪfter losing to my friends in Trivia Crack one too many times, I decided I wanted to see if I could win in my own, special way. The details of the vulnerability, how I found it, and how I built a Chrome extension to take advantage of it are below. So what’s wrong with Trivia Crack’s implementation that allowed me to so easily build a tool that lets anyone cheat? In short-when the Trivia Crack client requests from the Trivia Crack server the next question to ask the user, the server responds not just with the question and the possible answers, but also sends which answer is the correct answer. You can see Trivia Cracker in action below: Over the course of a weekend, I was able to write and release a Chrome extension, Trivia Cracker, that turned me from a mediocre-at-best Trivia Crack player to a seemingly genius demigod. You’d think the developers of such a polished and successful game might have taken the time to implement it in a way that is secure from cheating, but it turns out writing a program to cheat at Trivia Crack is actually fairly simple. Despite the simplicity (or maybe due to it), Trivia Crack has become very popular as of late-racking up 5.3 million likes on Facebook and becoming the top free app in the Google Play (Android) store. Essentially, you answer trivia questions of various categories, competing against your friends for bragging rights.

The premise of the game is simple, and very similar to another popular app from last year, QuizUp. For those of you who don’t know, Trivia Crack is a new game for Android, iPhone, and Facebook. During the holiday season, I started to notice that a new app, Trivia Crack, was becoming popular with my friends.

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