Denial of Service (DoS) Affecting pocketmine/pocketmine-mp package, versions >=4.0.0, <4.0.5<3.26.5


Severity

Recommended
0.0
high
0
10

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  • Snyk IDSNYK-PHP-POCKETMINEPOCKETMINEMP-2331745
  • published7 Jan 2022
  • disclosed6 Jan 2022
  • creditUnknown

Introduced: 6 Jan 2022

CVE NOT AVAILABLE CWE-400  (opens in a new tab)

How to fix?

Upgrade pocketmine/pocketmine-mp to version 4.0.5, 3.26.5 or higher.

Overview

pocketmine/pocketmine-mp is a highly customisable, open source server software for Minecraft: Bedrock Edition written in PHP

Affected versions of this package are vulnerable to Denial of Service (DoS). Some skin data fields (e.g., skinID, geometryName) are not capped in length. These fields are typically saved in the NBT data of a player when the player quits the server, or during an autosave.

This is problematic due to the 32767 byte limit on TAG_String's. If any of these fields exceeds 32767 bytes, an exception will be thrown during data saving, which will cause the server to crash.

A workaround is to check player skins during PlayerLoginEvent and PlayerSkinChangeEvent and ensure that the offending fields are not larger than 32767 bytes.

Details

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

  • High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

  • Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package

CVSS Scores

version 3.1