GHSA-8jq6-w5cg-wm45
Exploitable inventory component chaining in PocketMine-MP
Quick fix
GHSA-8jq6-w5cg-wm45 — pocketmine/pocketmine-mp: upgrade to the fixed version with the command below.
composer require pocketmine/pocketmine-mp:^3.15.4Details
### Impact Specially crafted `InventoryTransactionPacket`s sent by malicious clients were able to exploit the behaviour of `InventoryTransaction->findResultItem()` and cause it to take an abnormally long time to execute (causing an apparent server freeze).
The affected code is intended to compact conflicting `InventoryActions` which are in the same `InventoryTransaction` by flattening them into a single action. When multiple pathways to a result existed, the complexity of this flattening became exponential.
The problem was fixed by bailing when ambiguities are detected.
**At the time of writing, this exploit is being used in the wild by attackers to deny service to servers.**
### Patches Upgrade to 3.15.4 or newer.
### Workarounds No practical workarounds are possible, short of backporting the fix or implementing checks in a plugin listening to `DataPacketReceiveEvent`.
### References c368ebb5e74632bc622534b37cd1447b97281e20
### For more information If you have any questions or comments about this advisory: * Email us at [team@pmmp.io](mailto:team@pmmp.io)
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Affected packages
0Fixed in: 3.15.4composer require pocketmine/pocketmine-mp:^3.15.4