GMS-2022-1456: Denial-of-service vulnerability processing large chat messages containing many newlines

May 25, 2022

Impact

PocketMine-MP caps maximum chat message length at 512 Unicode characters, or about 2048 bytes. No more than 2 chat messages may be sent per tick. However, due to legacy reasons, incoming chat message blobs are split by ``, and each part is treated as a separate message, the length of each part is individually checked.

References

github.com/advisories/GHSA-gj94-v4p9-w672
github.com/pmmp/PocketMine-MP/security/advisories/GHSA-gj94-v4p9-w672

Code Behaviors & Features

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