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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
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UNIVERSAL NOSLOW BYPASS #1423

Closed C00LC0D35 closed 2 months ago

C00LC0D35 commented 3 months ago

Describe the bypass and how to replicate it

Basically, to bypass noslow, a client can just send two c09 (switchslot) packets to sword and back. This will bypass all noslow checks for sword, food, etc. This can easily be blocked by checking badpackets (two c09 in one tick = flag).

Grim version

Latest

Server version

Any (tested on 1.8)

Plugins

No

ManInMyVan commented 3 months ago

Duplicate of #1091

This can easily be blocked by checking badpackets (two c09 in one tick = flag).

This was what BadPacketM did, it was removed in 08d3392b0f0ed21b23aeb7cf35e683e50a7d7166 for not being a valid check.

z7087 commented 3 months ago

vanilla client can send 3 c09 in a tick (in my testing) https://github.com/z7087/Grim/tree/c09

ManInMyVan commented 3 months ago

vanilla client can send 3 c09 in a tick (in my testing)

If you're using an item, does it keep using the item if you change slots and back in one tick (like the noslow)? if not, can we reset item usage (should make it only swords)?

z7087 commented 3 months ago

If you're using an item, does it keep using the item if you change slots and back in one tick (like the noslow)?

i didnt find how client stop item using so likely yes (in 1.12.2, client and server)