Roblox-compatible bytecode after the change contained heavy use of encryption and obfuscation and required special signing from the server, which is where all client scripts were compiled. #Roblox hacks exploits code#The removal of bytecode had no other side effect than rendering code obfuscation impossible without other means.Īfter the removal of the Lua compiler from the client, Roblox made heavy changes to the Lua VM. Despite common belief, this exploit was unrelated to a Direct Dynamic Library (DLL) exploit in the same time period. This resulted in the removal of bytecode from Roblox and the ability to use it with the loading function. This made it possible to steal values from Roblox's API's, but months passed until someone found a way to use this bug to modify the global environment and to become capable to make the core scripts and the join script execute any Lua code in a game server. Using Lua bytecode, he created a function that allowed a script to steal values from other functions, including C functions. The Roblox user NecroBumpist proved the idea to be true and possible. It has been proposed on the Lua mailing list that direct stack manipulation could be used to access the environment of other functions during their execution and, therefore, to steal values from these functions (including C functions that Lua has access to), something which is not possible in pure Lua. The Roblox process can load Lua code and Lua bytecode through use of the loadstring function (which can be toggled on the ServerScriptService.) It is possible, though difficult, to write Lua assembly code manually and to assemble it into Lua bytecode. Lua bytecode does not have the same structure as Lua and allows, by unconventional means, manipulation of the stack and other things that are not possible in normal Lua programming. This process is irreversible without artifacts (via decompilation) and thus was frequently used for Code Obfuscation. When Lua runs programs, the Lua virtual machine compiles code to Lua bytecode before it is interpreted. Types of exploits Bytecode through loadstring function Once done, click "Submit" to send the report to Roblox's moderation team. Before submitting the report, make sure to include as much as detail as possible. Once you've confirmed that there is an exploiter in the server, use the Reporting feature (Report Abuse) and report the exploiter for Cheating/Exploiting.
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