![]() ![]() Sure, I could lookĪt the length of the checksum and make an educated guess as to which algorithm was In the request that we replayed, we can see that together with e another attribute Unfortunately, after I tried this and replayed the request, the server responded with the 400 Bad Request status code and the string bad_checksum in the body. Jackpot! All we have to do is change the score property in e and win. Examining the payload of the request we see the following. To swap javascript in production environments with javascript edited locally so I decided to give it a crack again.Īfter invoking mitmproxy and giving Everwing a run, I saw a request to a somewhatĮnticing host. I had a bit of experience using it at work in order In addition to helping us breakįacebook games, ( it’s even in the tutorial), MITM tools are also howįirewalls and network intrusion detection systems (NIDS) Or modify, every (HTTP/S?) packet sent to and from your computer. In the middle between your computer and the internet.īy sitting on the delivery path between your computer and the internet, MITM tools have the freedom to inspect, drop, These sorts of techniques usually rely on tools which sit as a man First AttemptĪs I mentioned above, I came at this problem first expecting to intercept and rewrite API requests For this reason, the exploit presented here uses a slightly different method. To do this, he simply replayed some HTTP POST requests which encoded the score of the player in plaintext.Īs it turns out, in the case of Everwing, this technique isn’t as easily applicable since scores are encoded The author showed how to set arbitrarily high scores in another Facebook Messenger game (Endless Lake). To gain gold and exp in a bit of a more unscrupulous manner. The combination of both has seemingly made the game very popular – at leastĪnyways, instead of playing the game, I was inspired by this blog post In addition, in typical Facebook game fashion, it also automatically advertises itself in Facebook Messenger to Is in its MMORPGesque mechanics of grinding out gold and exp to buy virtual items and level up your character. What really sets this game apart, however, You while simultaneously dodging fireballs and other projectiles. As much as I’d like to hide it, I’ve been (occasionally) playing a game on Facebook Messenger called Everwing.Īt its core, the game is just a generic scroll shooter where the goal is to kill as many bats flying towards ![]()
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