CVE-2021-44228 PoC — Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints

Source

https://github.com/obscuritylabs/log4shell-poc-lab

Associated Vulnerability

Title:Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints (CVE-2021-44228)
Description:Apache Log4j2 2.0-beta9 through 2.15.0 (excluding security releases 2.12.2, 2.12.3, and 2.3.1) JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who can control log messages or log message parameters can execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled. From log4j 2.15.0, this behavior has been disabled by default. From version 2.16.0 (along with 2.12.2, 2.12.3, and 2.3.1), this functionality has been completely removed. Note that this vulnerability is specific to log4j-core and does not affect log4net, log4cxx, or other Apache Logging Services projects.

Description

A lab demonstration of the log4shell vulnerability: CVE-2021-44228

Readme

# Log4Shell POC Demo

This repository contains a submodule, clone it with:

```shell
git clone --recurse-submodules git@github.com:obscuritylabs/log4shell-poc-lab.git
```

Then to start the demo execute:

```shell
docker compose up
```

To view the exploit creating a file on the victim server, execute:

```shell
docker compose exec victim ls -lah /tmp
```

# Blog Post
https://obscuritylabs.com/blog/log4shell-the-newest-vulnerability/

File Snapshot

Remarks

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