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GrimAnticheat / Grim

Fully async, multithreaded, predictive, open source, 3.01 reach, 1.005 timer, 0.01% speed, 99.99% antikb, "bypassable" 1.8-1.20 anticheat.
GNU General Public License v3.0
1.09k stars 325 forks source link

Bypassing FLY using Elytra. #1734

Open 6ex9one opened 1 month ago

6ex9one commented 1 month ago

Describe the bypass and how to replicate it

Players have found a workaround for flying on elytra, all they can do is put on elytra and fly straight up in the Y direction. Please fix this

Grim version

2.3.67

Server version

1.16.5

Plugins

SamB440 commented 1 month ago

Provide a debug log

6ex9one commented 1 month ago

Provide a debug log

As soon as I meet the player again, I will try to write down the debug code. But you can check this yourself using any cheat.

SamB440 commented 1 month ago

What is your max-firework-boost-ping set to in the config

SamB440 commented 1 month ago

But you can check this yourself using any cheat.

Also no I can't, it flags me.

Bruhdows commented 1 month ago

I've had a bit of Turkish users abusing this on my server. I can provide more info myself soon.

SamB440 commented 3 weeks ago

Any update?

Bruhdows commented 2 weeks ago

Really weird bypass, can't really reproduce it.

SamB440 commented 2 weeks ago

Could be a config issue

Bruhdows commented 2 weeks ago

Found it, you can use Y Elytra Flight in Cobwebs. It completely does not flag anything. You just need to overlap with the Cobwebs Bounding Box.

https://github.com/user-attachments/assets/4664d0cb-b20f-4aba-a097-fb5710dd1598

SamB440 commented 2 weeks ago

Oh then it’s not a big issue then. Likely 0.03 gets triggered since you’re moving so slow

Bruhdows commented 2 weeks ago

Um, also when the speed is low enough you can easily travel thru cobwebs horizontally. Probably the same issue.

https://github.com/user-attachments/assets/2242759e-f185-4c92-969b-cd2e51ced1d1

Bruhdows commented 2 weeks ago

I would try coding a fix for that. I don't know where to start tho, should I check out the current checks or create a new one just for that?

SamB440 commented 2 weeks ago

Can you provide a grim log, by triggering a flag when you exit the cobweb in the first video, as it will include the movement before that

Bruhdows commented 2 weeks ago

It was uploading and uploaded, but the provided link redirects to Not found page.

SamB440 commented 2 weeks ago

Try reloading or just sending it here or trying again, cloudflare cache messes it up