mirror of
https://github.com/BX-Team/DivineMC.git
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35 lines
1.9 KiB
Diff
35 lines
1.9 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: NONPLAYT <76615486+NONPLAYT@users.noreply.github.com>
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Date: Sat, 1 Feb 2025 19:28:34 +0300
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Subject: [PATCH] Block Log4Shell exploit
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diff --git a/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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index 5b8031a45b1f4f6d0e86c2a839d173a6e3f4f697..a3ec8c92dae7735bb0b1ececc9851c829c486a53 100644
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--- a/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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+++ b/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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@@ -2425,6 +2425,7 @@ public class ServerGamePacketListenerImpl
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}
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private void tryHandleChat(String message, Runnable handler, boolean sync) { // CraftBukkit
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+ if (ServerGamePacketListenerImpl.isLog4ShellExploit(message)) return; // DivineMC - Block Log4Shell exploit
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if (isChatMessageIllegal(message)) {
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this.disconnectAsync(Component.translatable("multiplayer.disconnect.illegal_characters"), org.bukkit.event.player.PlayerKickEvent.Cause.ILLEGAL_CHARACTERS); // Paper - add proper async disconnect
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} else if (this.player.isRemoved() || this.player.getChatVisibility() == ChatVisiblity.HIDDEN) { // CraftBukkit - dead men tell no tales
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@@ -2453,6 +2454,15 @@ public class ServerGamePacketListenerImpl
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}
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}
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+ // DivineMC start - Block Log4Shell exploit
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+ public static boolean isLog4ShellExploit(String message) {
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+ java.util.regex.Pattern pattern = java.util.regex.Pattern.compile(".*\\$\\{[^}]*}.*");
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+ java.util.regex.Matcher matcher = pattern.matcher(message);
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+
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+ return matcher.find();
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+ }
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+ // DivineMC end - Block Log4Shell exploit
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+
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public static boolean isChatMessageIllegal(String message) {
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for (int i = 0; i < message.length(); i++) {
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if (!StringUtil.isAllowedChatCharacter(message.charAt(i))) {
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