PaperMC/Spigot-Server-Patches/0209-Fix-exploit-that-allowed-colored-signs-to-be-created.patch
2020-11-09 00:09:37 +00:00

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Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: 0x22 <0x22@futureclient.net>
Date: Thu, 26 Apr 2018 04:41:11 -0400
Subject: [PATCH] Fix exploit that allowed colored signs to be created
diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
index 30bdf7dff8fc611677b95918574d4ad42ddf1c6c..7dd7289941253991d0a2aa22f9b058c116c14e82 100644
--- a/src/main/java/net/minecraft/server/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
@@ -2633,7 +2633,7 @@ public class PlayerConnection implements PacketListenerPlayIn {
String[] lines = new String[4];
for (int i = 0; i < list.size(); ++i) {
- lines[i] = EnumChatFormat.a(new ChatComponentText(EnumChatFormat.a((String) list.get(i))).getString());
+ lines[i] = SharedConstants.filterAllowedChatCharacters(list.get(i)); // Paper - Replaced with anvil color stripping method to stop exploits that allow colored signs to be created.
}
SignChangeEvent event = new SignChangeEvent((org.bukkit.craftbukkit.block.CraftBlock) player.getWorld().getBlockAt(x, y, z), this.server.getPlayer(this.player), lines);
this.server.getPluginManager().callEvent(event);
diff --git a/src/main/java/net/minecraft/server/SharedConstants.java b/src/main/java/net/minecraft/server/SharedConstants.java
index 9663e8c10662c9660964afda62d8a65812fae69d..470690dbe19db1622eca44f6801ece37d7ad7426 100644
--- a/src/main/java/net/minecraft/server/SharedConstants.java
+++ b/src/main/java/net/minecraft/server/SharedConstants.java
@@ -19,6 +19,7 @@ public class SharedConstants {
return c0 != 167 && c0 >= ' ' && c0 != 127;
}
+ public static String filterAllowedChatCharacters(String input) { return a(input); } // Paper - OBFHELPER
public static String a(String s) {
StringBuilder stringbuilder = new StringBuilder();
char[] achar = s.toCharArray();