Weakness
PocketMine-MP versions before 5.43.1 fail to properly validate the Certificate field during offline login authentication. Unauthenticated players can trigger an uninitialized property access error that crashes the server.
References
- https://github.com/pmmp/PocketMine-MP/commit/8c75a1d739e8e190d3cc2338b25cebcc9c052b1b
- https://github.com/pmmp/PocketMine-MP/commit/e4aaef4ee0f769b52dc0347a1d6da403b9691115
- https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-g2fj-p69p-9chp
- https://www.vulncheck.com/advisories/pocketmine-mp-before-5.43.1-denial-of-service-via-unauthenticated-login
- https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-g2fj-p69p-9chp
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