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GHSA-7m9r-rq9j-wmmhmedium5.3

PocketMine-MP vulnerable to denial-of-service by sending large modal form responses

Impact

Due to a workaround for an old client bug (which has since been fixed), very large JSON payloads in ModalFormResponsePacket were able to cause the server to spend a significant amount of time processing the packet. Large numbers of these packets were able to hog CPU time so as to prevent the server from processing other connections in a timely manner.

Source excerpt · OSV

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

pocketmine/pocketmine-mp Packagist
Affected rangeRecorded fix
Earlier releases before 4.12.5Ecosystem versions4.12.5

Version evidence: OSV · GHSA-7m9r-rq9j-wmmh

View original version evidence (226 explicit versions)

Original source description

Impact

Due to a workaround for an old client bug (which has since been fixed), very large JSON payloads in ModalFormResponsePacket were able to cause the server to spend a significant amount of time processing the packet. Large numbers of these packets were able to hog CPU time so as to prevent the server from processing other connections in a timely manner.

Patches

The problem has been addressed in 3baa5ab71214f96e6e7ab12cb9beef08118473b5 by removing the workaround code.

Workarounds

Plugins could cancel DataPacketReceiveEvent for this packet, decode the data their way, and then call Player->onFormSubmit() directly, bypassing the vulnerable code.

References