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Unchecked validity of Facing values in PlayerActionPacket

High severity GitHub Reviewed Published Jan 13, 2022 in pmmp/PocketMine-MP • Updated Jan 11, 2023

Package

composer pocketmine/pocketmine-mp (Composer)

Affected versions

< 4.0.6

Patched versions

4.0.6

Description

Impact

A remote attacker may crash a server by sending PlayerActionPacket with invalid facing values (e.g. negative), specifically with START_BREAK or CRACK_BLOCK actions, or with a UseItemTransactionData (typically in InventoryTransactionPacket).

Patches

f126479c37ff00a717a828f5271cf8e821d12d6c

Workarounds

Using a plugin, cancel DataPacketReceiveEvent if the packet is PlayerActionPacket and the facing is outside the range 0-5 when receiving START_BREAK or CRACK_BLOCK actions, or UseItemTransactionData. However, beware that negative values may be legitimate in some cases.

For more information

If you have any questions or comments about this advisory:

References

@dktapps dktapps published to pmmp/PocketMine-MP Jan 13, 2022
Reviewed Jan 13, 2022
Published to the GitHub Advisory Database Jan 13, 2022
Last updated Jan 11, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

No CWEs

CVE ID

No known CVE

GHSA ID

GHSA-xh99-hw7h-wf63

Source code

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