CloudArmor · Runtime Application Self-Protection Module - Log4j2 Version

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This project is a local version from CloudArmor specifically built for defending Log4j2 CVE-2021-44228 . No network connection is required to run this project.

Please DO TESTING before deploying it to production environment.

The application self-defense module uses RASP technology to inject probes into Java applications. The detection of log4j2 is achieved by detecting the execution context, which can also provide protection for non-Web business programs.

The defense module will block JNDI injection initiated through log4j2 by default.

It is worth noting that although Oracle no longer loads remote classes through JNDI by default in 6u211, 7u201, 8u191, and 11.0.1, attackers have discovered that remote command execution can still be accomplished through third-party components such as tomcat-el.

Installation

This project includes two JAR packages, rasp-loader.jar and rasp-core.jar, which have been compiled to dist.

The self-defense module supports normal and restart-free installation.

Normal installation

Append -javaagent:rasp-loader.jar to Java program startup script argument list

Example: for SpringBoot applications, modify the argument list to append java -javaagent:rasp-loader.jar -jar springboot.jar

Restart-free installation

Execute java -jar rasp-loader.jar, and follow the prompts to inject into specific JVM processes

Interception test

Compile from source

Run build.sh

Compatibility

Support JDK from version 6 to 16