A Bug in Steam, Which Was Recently Patched, Could Have Given Users Access To Activation Key of Any Game

Ukrainian vulnerability researcher has found a bug that would have allowed him to download all the activation keys (also known as CD keys) made available through the Steam gaming platform, for any game, ever. From a report: Discovered by Artem Moskowsky, the bug resided in Steamworks, a platform that Valve runs to help developers with building and publishing games via its Steam gaming client. Moskowsky found the bug in a Steam web API located at partner.steamgames.com/partnercdkeys/assignkeys/. This is the API that lets game developers or affiliates retrieve CD keys made available to Steam users so their customers can activate a game installed via the Steam client. This API is accessible using a regular Steam account and takes several parameters, but the ones most relevant are appid (representing the game), keyid (representing the identifier of a set of CD keys), and keycount (representing the number of CD keys that Steam needs to return inside a CD key set).

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