Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS03bTlyLXJxOWotd21taM4AAw1h

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.

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.

Permalink: https://github.com/advisories/GHSA-7m9r-rq9j-wmmh
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS03bTlyLXJxOWotd21taM4AAw1h
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 9 months ago
Updated: 9 months ago

CVSS Score: 5.3
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Identifiers: GHSA-7m9r-rq9j-wmmh
References:

• https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-7m9r-rq9j-wmmh
• https://github.com/advisories/GHSA-7m9r-rq9j-wmmh

Affected Packages