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Code Issues Releases Activity

Update to 1.21.3

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NONPLAYT
2024-11-02 16:43:01 +03:00
parent f633f03709
commit deacaf316e
64 changed files with 338 additions and 349 deletions
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47
patches/server/0031-Block-Log4Shell-exploit.patch Normal file
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@@ -0,0 +1,47 @@
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 50bc64000f24aa2ae0df2ce7fc77f27d760b8764..9aabf8d4a333f96f1431da12cd42766a6d1676bd 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -2454,6 +2454,7 @@ 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.disconnectAsync((Component) Component.translatable("multiplayer.disconnect.illegal_characters"), org.bukkit.event.player.PlayerKickEvent.Cause.ILLEGAL_CHARACTERS); // Paper // Paper - add proper async disconnect
} else if (this.player.isRemoved() || this.player.getChatVisibility() == ChatVisiblity.HIDDEN) { // CraftBukkit - dead men tell no tales
@@ -2485,6 +2486,15 @@ 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 48ad261eec1b74fad5a4fc1516b75fd2aaecd528..05739dc79fb6518680b861ebbd632514e30907c2 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -768,6 +768,8 @@ 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)) {