GMS-2022-454: NaN/INF in serverbound movement packets can crash clients and servers

March 18, 2022 (updated March 21, 2022)

A malicious client may send a MovePlayerPacket to the server whose position or rotation contains NaN or INF. Since neither the server nor vanilla client handles this properly, a number of interesting side effects come into play.

References

github.com/advisories/GHSA-fm35-jgg3-3grx
github.com/pmmp/PocketMine-MP/security/advisories/GHSA-fm35-jgg3-3grx

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