Grief Prevention

Grief Prevention

Bukkit Plugins
1M Downloads

Armor Stand Can Be Moved Inside Claims Using Mace Ability (1.21.5 paper)

ProbablyYash opened this issue · 1 comments

commented

Observed Behavior

Untrusted players can exploit the mace's knockback effect to move armor stands out of claimed areas. For example, when a player is PvP-tagged and stands next to an armor stand within a claim, an attacker can hit the player and cause the mace’s knockback (e.g., Burst enchantment) to push the armor stand outside the claim boundaries.

Expected Behavior

Claims should prevent any interaction or movement of armor stands by untrusted players, including indirect methods such as knockback from PvP or enchantments like Burst on a mace.

Reproduction steps

  1. Stand near an armor stand inside a claim.
  2. Get PvP-tagged (e.g., in combat).
  3. Have an untrusted player hit you with a mace that has Burst or similar knockback ability.
  4. Observe the armor stand being pushed out of the claim.

Stack trace or error log

N/A – This is a behavior issue, not a crash.

Server version

Paper version git-Paper-1.21.5-69-main@c98cd65 (2025-05-03T20:38:42Z) (MC: 1.21.5)

GriefPrevention version

GriefPrevention version - 16.18.4

Configuration

# Default values are perfect for most servers.  If you want to customize and have a question, look for the answer here first: http://dev.bukkit.org/bukkit-plugins/grief-prevention/pages/setup-and-configuration/

GriefPrevention:
  SeaLevelOverrides:
    world: -1
    world_nether: -1
    spawn: -1
  Claims:
    Mode:
      spawn: Survival
      world_nether: Disabled
      world: Survival
    PreventGlobalMonsterEggs: true
    PreventTheft: true
    ProtectCreatures: true
    PreventButtonsSwitches: true
    LockWoodenDoors: false
    LockTrapDoors: false
    LockFenceGates: true
    EnderPearlsRequireAccessTrust: true
    RaidTriggersRequireBuildTrust: true
    ProtectHorses: true
    ProtectDonkeys: true
    ProtectLlamas: true
    InitialBlocks: 100
    Claim Blocks Accrued Per Hour:
      Default: 100
    Max Accrued Claim Blocks:
      Default: 80000
    Accrued Idle Threshold: 0
    AccruedIdlePercent: 0
    AbandonReturnRatio: 1.0
    AutomaticNewPlayerClaimsRadius: 4
    AutomaticNewPlayerClaimsRadiusMinimum: 0
    ExtendIntoGroundDistance: 5
    MinimumWidth: 5
    MinimumArea: 100
    MaximumDepth: -2147483648
    InvestigationTool: STICK
    ModificationTool: GOLDEN_SHOVEL
    Expiration:
      ChestClaimDays: 7
      UnusedClaimDays: 14
      AllClaims:
        DaysInactive: 60
        ExceptWhenOwnerHasTotalClaimBlocks: 10000
        ExceptWhenOwnerHasBonusClaimBlocks: 5000
      AutomaticNatureRestoration:
        SurvivalWorlds: false
    AllowTrappedInAdminClaims: false
    MaximumNumberOfClaimsPerPlayer: 0
    CreationRequiresWorldGuardBuildPermission: true
    VillagerTradingRequiresPermission: true
    CommandsRequiringAccessTrust: /sethome
    DeliverManuals: true
    ManualDeliveryDelaySeconds: 30
    RavagersBreakBlocks: true
    FireSpreadsInClaims: false
    FireDamagesInClaims: false
    LecternReadingRequiresAccessTrust: true
  Spam:
    Enabled: true
    LoginCooldownSeconds: 60
    LoginLogoutNotificationsPerMinute: 5
    ChatSlashCommands: /me;/global;/local
    WhisperSlashCommands: /tell;/pm;/r;/whisper;/msg
    WarningMessage: Please reduce your noise level.  Spammers will be banned.
    BanOffenders: true
    BanMessage: Banned for spam.
    AllowedIpAddresses: 1.2.3.4; 5.6.7.8
    DeathMessageCooldownSeconds: 120
    Logout Message Delay In Seconds: 0
  PvP:
    RulesEnabledInWorld:
      world: true
      world_nether: true
      spawn: true
    ProtectFreshSpawns: true
    PunishLogout: true
    CombatTimeoutSeconds: 15
    AllowCombatItemDrop: false
    BlockedSlashCommands: /home;/vanish;/spawn;/tpa
    ProtectPlayersInLandClaims:
      PlayerOwnedClaims: true
      AdministrativeClaims: true
      AdministrativeSubdivisions: true
    AllowLavaDumpingNearOtherPlayers:
      PvPWorlds: true
      NonPvPWorlds: false
    AllowFlintAndSteelNearOtherPlayers:
      PvPWorlds: true
      NonPvPWorlds: false
    ProtectPetsOutsideLandClaims: false
  Economy:
    ClaimBlocksMaxBonus: 0
    ClaimBlocksPurchaseCost: 0.0
    ClaimBlocksSellValue: 0.0
  ProtectItemsDroppedOnDeath:
    PvPWorlds: false
    NonPvPWorlds: true
  BlockLandClaimExplosions: true
  BlockSurfaceCreeperExplosions: true
  BlockSurfaceOtherExplosions: true
  LimitSkyTrees: true
  LimitTreeGrowth: false
  PistonMovement: CLAIMS_ONLY
  PistonExplosionSound: true
  FireSpreads: false
  FireDestroys: false
  AdminsGetWhispers: true
  AdminsGetSignNotifications: true
  VisualizationAntiCheatCompatMode: false
  SmartBan: true
  Mute New Players Using Banned Words: true
  MaxPlayersPerIpAddress: 3
  SilenceBans: true
  Siege:
    Worlds: []
    BreakableBlocks:
    - LIME_WOOL
    - BLACK_WOOL
    - YELLOW_WOOL
    - BIRCH_PLANKS
    - GLASS
    - OAK_PLANKS
    - GRASS_BLOCK
    - FERN
    - WHITE_WOOL
    - ORANGE_WOOL
    - DARK_OAK_PLANKS
    - LIGHT_GRAY_WOOL
    - DEAD_BUSH
    - JUNGLE_PLANKS
    - MAGENTA_WOOL
    - GREEN_WOOL
    - DIRT
    - CYAN_WOOL
    - SNOW
    - SHORT_GRASS
    - BLUE_WOOL
    - BROWN_WOOL
    - SPRUCE_PLANKS
    - GRAY_WOOL
    - COBBLESTONE
    - RED_WOOL
    - SAND
    - ACACIA_PLANKS
    - PINK_WOOL
    - GRAVEL
    - PURPLE_WOOL
    - GLASS_PANE
    - LIGHT_BLUE_WOOL
    DoorsOpenDelayInSeconds: 300
    CooldownEndInMinutes: 60
  EndermenMoveBlocks: false
  SilverfishBreakBlocks: false
  CreaturesTrampleCrops: false
  RabbitsEatCrops: true
  HardModeZombiesBreakDoors: false
  MobProjectilesChangeBlocks: false
  Database:
    URL: ''
    UserName: ''
    Password: ''
  UseBanCommand: true
  BanCommandPattern: kick %name% %reason%
  Advanced:
    fixNegativeClaimblockAmounts: true
    ClaimExpirationCheckRate: 60
    OfflinePlayer_cache_days: 90
  Abridged Logs:
    Days To Keep: 7
    Included Entry Types:
      Social Activity: true
      Suspicious Activity: true
      Administrative Activity: false
      Debug: false
      Muted Chat Messages: false
  ConfigVersion: 1

Plugin list

EconomyShopGUI, ajLeaderboards, AuthMe, BetterRTP, BoomBox, Citizens, ClearLag, DecentHolograms, DeluxeMenus, DiscordSRV, Essentials, EssentialsChat, EssentialsSpawn, floodgate, Geyser-Spigot, GriefPrevention, Infiniteannouncements, LuckPerms, MiniMOTD, Multiverse-Core, NoteBlockAPI, packetevents, PlaceholderAPI, PlayerAuctions, PlayerKits2, ProtocolLib, SkinsRestorer, TAB, Vault, ViaBackwards, ViaRewind, ViaVersion, vpn-system, Vulcan, WorldEdit, WorldGuard

Running without GriefPrevention

  • I attempted running the server without GriefPrevention installed.
  • The problem does not occur when GriefPrevention is removed from the server.

Running with only GriefPrevention

  • I attempted running only GriefPrevention on the server.
  • The issue still occurs when GriefPrevention is the only plugin running.

Running on a fresh, clean server installation

  • I attempted testing for the issue on a new server.
  • The issue still occurs on a new server.

Using unmodified client

  • I attempted testing for the issue with the vanilla client.
  • The issue still occurs when using the vanilla client.

We appreciate you taking the time to fill out a bug report!

  • I searched for similar issues before submitting this bug report.
commented

ANY ETA ON THIS? Players abusing it!