grimfly disabler

[tomh500]

Describe the bypass and how to replicate it

//OK this source form liquidbounce nextgen.and it's can work on 1.12.2-1.20.4 cheat client

package net.ccbluex.liquidbounce.features.module.modules.exploit.disabler.disablers

import net.ccbluex.liquidbounce.config.ToggleableConfigurable import net.ccbluex.liquidbounce.event.events.PacketEvent import net.ccbluex.liquidbounce.event.events.TransferOrigin import net.ccbluex.liquidbounce.event.handler import net.ccbluex.liquidbounce.features.fakelag.DelayData import net.ccbluex.liquidbounce.features.module.modules.exploit.disabler.ModuleDisabler import net.ccbluex.liquidbounce.lang.translation import net.ccbluex.liquidbounce.utils.client.* import net.minecraft.network.packet.c2s.common.CommonPongC2SPacket import net.minecraft.network.packet.s2c.common.CommonPingS2CPacket import net.minecraft.network.packet.s2c.play.PlayerPositionLookS2CPacket

/**

• Ancient disabler method... but still works
• On Grim you need a lot of extra logic for it to works.

• I will try my best to explain everything. */ internal object DisablerGrimSpectate : ToggleableConfigurable(ModuleDisabler, "GrimSpectate", false) {

  private val packetQueue = LinkedHashSet() private var delay = false

  override fun enable() { chat(warning(translation("liquidbounce.module.disabler.messages.grimSpectateEnableMessage"))) super.enable() }

  override fun disable() { if (inGame) { packetQueue.forEach { handlePacket(it.packet) } }

  packetQueue.clear()
  delay = false

  }

  /**

  • This is simple... most AntiCheat use transaction to check if the packet it sent u have arrived.
  • So we are going to delay the transaction when we got fly abilities from dead spectator or etc...
  • to make the server think we haven't received the set your fly status to false
  • (after you respawn and not spectating anymore).
  • So we can disable the AntiCheat, since this could happen to some extreme laggy player,
  • it not really much proper, way to patch without affect the legits... That what we're going to abuse.
  • You get it, the idea is really stupid but works on old Intave and Grim
  • On Old Intave, player will not show up... on grim, it will flag reach which is make sense.
  • Grim think that you haven't received the player move packet so you for grim all player on our client-sided
  • it not moving and ofc that mean we are reaching or not even looking at the target.

  • https://github.com/GrimAnticheat/Grim/blob/2.0/src/main/java/ac/grim/grimac/events/packets/PacketPlayerAbilities.java */ @Suppress("unused") val packetHandler = handler { event -> val packet = event.packet

    if (player.age < 20) { packetQueue.clear() return@handler }

    if (event.origin != TransferOrigin.RECEIVE) { return@handler }

    /**

    • THIS IS FOR GRIM....
    • Here come a bit tricky, after you not in spectator anymore, you got teleport back.
    • (I hate BadPacketsN). BadPacketsN check teleport queues every PlayerMoveC2SPacket.Full.
    • When you release your transaction packets you delay
    • your lastTransaction data on Grim (or any) will go to the latest transaction.
    • But BadPacketsN check if the transaction use
    • for teleport is > your latest send transaction. Since u sent it like all in one,
    • it will not have time to check and wait for next tick that is PlayerMoveC2SPacket.Full
    • to check for BadPacketsN. But since your transaction is latest and your teleport
    • transaction is behind then it will flag
    • Bypass BadPacketsN is not hard but... either way even if we bypass it, it will still set us back...
    • TODO: FIND A WAY AROUND THIS (works on all sv)

    • ---

    • Ok on some server we get teleport Packet before Abilities packet when we out of spectator,
    • how about we just delay right after teleport?
    • (please don't turn this on before you in spectator)
    • I'm not good at explaining stuff...
    • https://github.com/GrimAnticheat/Grim/blob/2.0/src/main/java/ac/grim/grimac/manager/SetbackTeleportUtil.java */ if (packet is PlayerPositionLookS2CPacket) { // Should we start delaying? if (player.abilities.flying && !delay) { delay = true } else if (delay) { /**
      • We flagged, info the player and add to packet queue to bypass BadPacketsN.
      • This should not autotoggle, since everything that has been used
      • with disabler would still be enabled. */ packetQueue.add(DelayData(packet, System.currentTimeMillis())) chat(markAsError(translation("liquidbounce.module.disabler.messages.grimSpectateMessage"))) } }

    if (delay) { // it's not really good idea to delay our packets for way too long, let's just release it after a while // idk this is fine for minemalia ig. // if (timer.hasElapsed(seconds.toLong() * 1000L)) { // packetQueue.forEach() { handlePacket(it.packet) } // packetQueue.clear() // // delay = false // timer.reset() // }

    // delay transaction of course so the server will think we still have the flying ablities.
    if (packet is CommonPingS2CPacket) {
        packetQueue.add(DelayData(packet, System.currentTimeMillis()))
        event.cancelEvent()
    
        // Prevent you from getting timed out, it will not work if your version is below 1.17
        network.sendPacket(CommonPongC2SPacket(0))
    }

    } } }

Grim version

Latest build still has this problem

Server version

spigot 1.8-1.20.4

Plugins

grimac spartan

[ManInMyVan]

duplicate of #1421

[SamB440]

Wasn't the spectator disabler fixed

[NotBlank7]

I Hate people who just report stuff from lb thats alr patched

[ManInMyVan]

Wasn't the spectator disabler fixed

Not really, it's just a ping limiter