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

Source

https://github.com/Tai-e/CVE-2021-44228

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

Utilize Tai-e to identify the Log4shell (a.k.a. CVE-2021-44228) Vulnerability

Readme

<div align="center">
  <img src="https://raw.githubusercontent.com/pascal-lab/Tai-e/master/tai-e-logo.png" height="200">

# Tai-e for CVE-2021-44228

</div>

This a sample project that utilizes [Tai-e](https://github.com/pascal-lab/tai-e) to identify Log4Shell (a.k.a. CVE-2021-44228) vulnerability and its trigger paths

Related video (in Chinese): https://www.bilibili.com/video/BV1dV411F781

## Getting started

Clone this repository via Git:

```
git clone https://github.com/Tai-e/CVE-2021-44228.git
```

Run the following command in your terminal:

```
./gradlew run
```

Check the `taint-flow-graph.dot` and `tai-e.log` in the output directory `./output` for the results.

Optional: you could use the following command to transform the dot file to svg file in the `./output` directory

```
dot -Tsvg -o taint-flow-graph.svg taint-flow-graph.dot
```


---

This repo based on the [Tai-e Template][template].

[template]: https://github.com/Tai-e/Tai-e-Template

File Snapshot


 [4.0K]  /data/pocs/37fe6c593380b16c83b56f775c0209e927e6c3f1
├── [ 572]  build.gradle.kts
├── [4.0K]  gradle
│   └── [4.0K]  wrapper
│       ├── [ 62K]  gradle-wrapper.jar
│       └── [ 250]  gradle-wrapper.properties
├── [8.4K]  gradlew
├── [2.8K]  gradlew.bat
├── [4.0K]  java-benchmarks
│   ├── [4.0K]  JREs
│   │   └── [4.0K]  jre1.8
│   │       ├── [3.0M]  charsets.jar
│   │       ├── [ 94K]  jce.jar
│   │       ├── [1.8M]  jsse.jar
│   │       ├── [ 376]  management-agent.jar
│   │       ├── [   0]  openjdk-1.8.0_312.txt
│   │       ├── [3.4M]  resources.jar
│   │       └── [ 62M]  rt.jar
│   ├── [4.0K]  log4j
│   │   └── [4.0K]  2.14.0
│   │       ├── [294K]  log4j-api-2.14.0.jar
│   │       ├── [1.7M]  log4j-core-2.14.0.jar
│   │       ├── [ 728]  options.yml
│   │       ├── [1.2K]  refl.log
│   │       ├── [ 804]  Server.class
│   │       ├── [ 382]  Server.java
│   │       ├── [1.4K]  taint-config.yml
│   │       └── [429K]  taint-flow-graph-highlighted.svg
│   └── [ 185]  README.md
├── [ 967]  README.md
└── [4.0K]  src
    └── [4.0K]  main
        └── [4.0K]  java
            └── [4.0K]  org
                └── [4.0K]  example
                    └── [ 218]  MyMain.java

12 directories, 23 files

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