Log4J Patched Dependency for Log4Shell

This repository aims to provide a patched version of the Log4J library for legacy system that can not be updated right away.

The patch consist in a modified version of the log4j-core.x.x.x.jar file following the official recommandation of the Apache foundation.

The modified version does not contains the JndiLookup.class class anymore.

How to use it

First, you shouldn't trust random people on internet.

This repository includes a script that allows to generated patched version of the library on your computer:

Download original library from a trusted source (Maven)
Apply the patch by removing the JndiLookup.class file
Replace the log4j-core-x.x.x.jar on your system by the patched one (use find / -name log4j-core*.jar to find it)

version=2.8.2 # replace your desired version of log4j here

wget https://repo1.maven.org/maven2/org/apache/logging/log4j/log4j-core/$version/log4j-core-$version.jar

zip -q -d log4j-core-$version.jar org/apache/logging/log4j/core/lookup/JndiLookup.class

If you cannot apply the patch yourself, you can directly download the patched jar from this repository:

Info: version before 2.0-beta9 are not affected since they do not contains the flawed class.

About

Provide patched version of Log4J against CVE-2021-44228 and CVE-2021-45046 as well as a script to manually patch it yourself

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