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GHSA-g274-c6jj-h78p

MediumCVSS 5.3 / 10
Published Mar 10, 2025·Last modified Mar 10, 2025
Affected Components(0)

No affected components available

Description

Impact

Due to lack of limits by default in the explode() function, malicious clients were able to abuse some packets to waste server CPU and memory.

This is similar to a previous security issue published in https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-gj94-v4p9-w672, but with a wider impact, including but not limited to:

  • Sign editing
  • LoginPacket JWT parsing
  • Command parsing

However, the estimated impact of these issues is low, due to other limits such as the packet decompression limit.

Patches

The issue was fixed in 5.25.2 via d0d84d4c5195fb0a68ea7725424fda63b85cd831.

A custom PHPStan rule has also been introduced to the project, which will henceforth require that all calls to explode() within the codebase must specify the limit parameter.

Workarounds

No simple way to fix this. Given that sign editing is the easiest way this could be exploited, workarounds could include plugins pre-processing BlockActorDataPacket to check that the incoming text doesn't have more than 4 parts when split by \n.

Risk Scores
Base Score
5.3

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the availability of the system.

Threat Intelligence
4.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Medium severity
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