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this post was submitted on 14 Nov 2025
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Linux Gaming
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That sounds entirely on Steam. The game is the client in this context, and Steam as the server shouldn't be trusting anything from the client.
This was like, over a decade back, I don't remember it in accurate detail, and also, Garry deleted all the old Facepunch forums, which I do remember having a lot of discussion about this...
But, best I can recall, it was something like a buffer overflow/memory space exploit, because Garry exposed a core Steam function, that normally is only called by other Steam functions, in c++...
Well, Garry decided to give basically a lua api / reference method of accessing it directly, allowing doing arbitrary code injection into it, from anyone running a GMod server or networked client.
So I mean yeah, you can say Valve should not have trusted Garry with low level access to Source and Steam, that that's their bad, they should have expected he would create a serious security exploit out of naivette/hubris, like the proverbial junior sql db admin who just does 'DROP ALL' on prod, as an 'experiment'.
Uh yep, I would agree with that.
... I think this may have had something to do with Steam's, fairly new at the time, achievements system roll out, but I'm not sure if that's correct.