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All Projects → CreeperHost → Log4jPatcher

CreeperHost / Log4jPatcher

Licence: MIT, Unknown licenses found Licenses found MIT LICENSE.txt Unknown LICENSE-header.txt
A mitigation for CVE-2021-44228 (log4shell) that works by patching the vulnerability at runtime. (Works with any vulnerable java software, tested with java 6 and newer)

Programming Languages

java
68154 projects - #9 most used programming language

Labels

log4jlog4j2cve-2021-44228log4shell

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Log4jPatcher

A Java Agent based mitigation for Log4j2 JNDI exploits.

This agent employs 2 patches:

  • Disabling all Lookup conversions (on supported Log4j versions) in org.apache.logging.log4j.core.pattern.MessagePatternConverter by setting noLookups to true in the constructor.
  • Disabling the org.apache.logging.log4j.core.lookup.JndiLookup class by just returning null in its lookup function.

To use

Download the latest release available from GitHub: https://github.com/CreeperHost/Log4jPatcher/releases

Add -javaagent:Log4jPatcher.jar as a JVM argument.

For Minecraft users: The full path to the jar needs to be added in the above argument unless the jar is put into the instance (or .minecraft) folder. This jar does not go into the mods folder.

You can find a guide for Minecraft here:

https://www.creeperhost.net/wiki/books/minecraft-java-edition/page/mitigating-cve-2021-44228-in-minecraft

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