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

Source

https://github.com/claranet/ansible-role-log4shell

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

Find Log4Shell CVE-2021-44228 on your system

Readme

# Ansible role - log4shell
[![Maintainer](https://img.shields.io/badge/maintained%20by-claranet-e00000?style=flat-square)](https://www.claranet.fr/)
[![License](https://img.shields.io/github/license/claranet/ansible-role-log4shell?style=flat-square)](LICENSE)
[![Release](https://img.shields.io/github/v/release/claranet/ansible-role-log4shell?style=flat-square)](https://github.com/claranet/ansible-role-log4shell/releases)
[![Status](https://img.shields.io/github/workflow/status/claranet/ansible-role-log4shell/Ansible%20Molecule?style=flat-square&label=tests)](https://github.com/claranet/ansible-role-log4shell/actions?query=workflow%3A%22Ansible+Molecule%22)
[![Ansible version](https://img.shields.io/badge/ansible-%3E%3D4-black.svg?style=flat-square&logo=ansible)](https://github.com/ansible/ansible)
[![Ansible Galaxy](https://img.shields.io/badge/ansible-galaxy-black.svg?style=flat-square&logo=ansible)](https://galaxy.ansible.com/claranet/log4shell)


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Find Log4Shell CVE-2021-44228 on your system

This role tries to find JAR and WAR from filesystem and from opened files (lsof)

:warning: Your system may runs slowly during the scan due to a `find` on `/` and the unarchive process to lookup inside the JARs/WARs

This role populates the variable `log4shell_analyze_versions` with a dictionary like this one:
```
{
    "/tmp/rundeck.war": {
        "version": "2.13.2",
        "type": "war",
        "jndilookup": false
    },
    "/tmp/apache-log4j-2.12.1-bin/log4j-core-2.12.1.jar": {
        "version": "2.12.1",
        "type": "jar",
        "jndilookup": true
    },
    "/tmp/apache-log4j-2.12.1-bin/log4j-core-2.12.1-tests.jar": {
        "version": "2.12.1",
        "type": "jar",
        "jndilookup": false
    }
}
```

The key is the path where the role has found the log4j library.

The value is a dictionary containing the log4j version in `version`, the file type in `type` (war/jar) and and the key `jndilookup` which tells you if the file `org/apache/logging/log4j/core/lookup/JndiLookup.class` is present in a jar

A JAR without JndiLookup.class is not vulnerable according to [https://www.kb.cert.org/vuls/id/930724](https://www.kb.cert.org/vuls/id/930724)


## :warning: Requirements

Ansible >= 4

## :zap: Installation

```bash
ansible-galaxy install claranet.log4shell
```

## :gear: Role variables

Variable                | Default value | Description
------------------------|---------------|------------------------
log4shell_scan_path     | /             | Filesystem path to scan

## :arrows_counterclockwise: Dependencies

N/A

## :pencil2: Example Playbook

```yaml
---
- hosts: all
  roles:
    - role: claranet.log4shell
      log4shell_scan_path: /opt
```

## :closed_lock_with_key: [Hardening](HARDENING.md)

## :heart_eyes_cat: [Contributing](CONTRIBUTING.md)

## :copyright: [License](LICENSE)

[Mozilla Public License Version 2.0](https://www.mozilla.org/en-US/MPL/2.0/)

File Snapshot


 [4.0K]  /data/pocs/ede1aab175e8b83a521513bd48da1738c78d5d37
├── [4.2K]  CONTRIBUTING.md
├── [4.0K]  defaults
│   └── [  31]  main.yml
├── [ 186]  HARDENING.md
├── [ 16K]  LICENSE
├── [4.0K]  meta
│   └── [ 526]  main.yml
├── [4.0K]  molecule
│   ├── [4.0K]  default
│   │   ├── [1.1K]  converge.yml
│   │   ├── [ 941]  Dockerfile.j2
│   │   ├── [ 908]  molecule.yml
│   │   └── [4.0K]  tests
│   │       └── [ 236]  test_default.py
│   └── [4.0K]  find_empty_folder
│       ├── [ 903]  converge.yml
│       ├── [ 941]  Dockerfile.j2
│       ├── [4.0K]  files
│       │   └── [1.3K]  dummy-jars.war
│       ├── [ 908]  molecule.yml
│       └── [4.0K]  tests
│           └── [ 236]  test_default.py
├── [2.9K]  README.md
├── [4.0K]  tasks
│   ├── [3.0K]  analyze.yml
│   ├── [ 114]  install.yml
│   ├── [ 132]  main.yml
│   └── [4.0K]  search
│       ├── [ 394]  find.yml
│       └── [ 353]  lsof.yml
└── [4.0K]  vars
    └── [ 134]  main.yml

11 directories, 21 files

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