GHSA-h6j3-j35f-v2x7: PocketMine-MP server crash with certain invalid JSON payloads in `LoginPacket` due to dependency vulnerability (3rd time)
Impact
An attacker could crash the server by sending malformed JWT JSON in LoginPacket due to a security vulnerability in netresearch/jsonmapper, due to attempting to construct objects from scalar types by default without any validation, with unexpected results that caused PocketMine-MP to crash.
Due to the relatively high number of security issues arising from this specific dependency, the team is exploring options to replace it.
Patches
In the meantime, the issue was fixed by pmmp/netresearch-jsonmapper@b96a209f9e8b76b899a0d0918493cd87eb3c02a7 and 6872661fd03649cc7a8762c41c16e9ee5a4de1c9.
Workarounds
Detecting the malicious data that triggers this issue is of rather high difficulty, so it’s not likely that a plugin would be able to easily remediate this.
References
https://github.com/cweiske/jsonmapper/issues/226
References
- github.com/advisories/GHSA-h6j3-j35f-v2x7
- github.com/cweiske/jsonmapper/issues/226
- github.com/pmmp/PocketMine-MP
- github.com/pmmp/PocketMine-MP/commit/6872661fd03649cc7a8762c41c16e9ee5a4de1c9
- github.com/pmmp/PocketMine-MP/security/advisories/GHSA-h6j3-j35f-v2x7
- github.com/pmmp/netresearch-jsonmapper/commit/b96a209f9e8b76b899a0d0918493cd87eb3c02a7
Code Behaviors & Features
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