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Code Issues Releases Activity

Fix MC-183518

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NONPLAYT
2024-06-17 17:24:01 +03:00
parent 4adac56a0b
commit bbda4e170e
32 changed files with 332 additions and 0 deletions
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47
patches/server/0037-Block-Log4Shell-exploit.patch
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@@ -1,47 +0,0 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: NONPLAYT <76615486+NONPLAYT@users.noreply.github.com>
Date: Thu, 23 May 2024 02:06:30 +0300
Subject: [PATCH] Block Log4Shell exploit
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 1c41ad915ad5f1ef63fea96fefe53fd037174ac3..cb1b861df277abdb0985f978f4e2d5419d279d2a 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -2353,6 +2353,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
}
private void tryHandleChat(String s, Runnable runnable, boolean sync) { // CraftBukkit
+ if (ServerGamePacketListenerImpl.isLog4ShellExploit(s)) return; // DivineMC - Block Log4Shell exploit
if (ServerGamePacketListenerImpl.isChatMessageIllegal(s)) {
this.disconnect((Component) Component.translatable("multiplayer.disconnect.illegal_characters"), org.bukkit.event.player.PlayerKickEvent.Cause.ILLEGAL_CHARACTERS); // Paper
} else if (this.player.isRemoved() || this.player.getChatVisibility() == ChatVisiblity.HIDDEN) { // CraftBukkit - dead men tell no tales
@@ -2384,6 +2385,15 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
}
}
+ // DivineMC start - Block Log4Shell exploit
+ public static boolean isLog4ShellExploit(String message) {
+ java.util.regex.Pattern pattern = java.util.regex.Pattern.compile(".*\\$\\{[^}]*}.*");
+ java.util.regex.Matcher matcher = pattern.matcher(message);
+
+ return matcher.find();
+ }
+ // DivineMC end
+
public static boolean isChatMessageIllegal(String message) {
for (int i = 0; i < message.length(); ++i) {
if (!StringUtil.isAllowedChatCharacter(message.charAt(i))) {
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index 61ae7f9d871bb2747c928e91eb07496b862a4975..20e77d90bbe97e2c711a9f4ef6d47906595d99d7 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -751,6 +751,8 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
Preconditions.checkArgument(msg != null, "msg cannot be null");
if (this.getHandle().connection == null) return;
+
+ if (ServerGamePacketListenerImpl.isLog4ShellExploit(msg)) return; // DivineMC - Block Log4Shell exploit
// Paper start - Improve chat handling
if (ServerGamePacketListenerImpl.isChatMessageIllegal(msg)) {