Veracode XML外部实体参考(XXE)

本文介绍了Veracode XML外部实体参考(XXE)的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我在veracode报告中得到了下一个发现:XML外部实体引用('XXE')的不当限制(CWE ID 611) 引用下面的代码

I've got the next finding in my veracode report:Improper Restriction of XML External Entity Reference ('XXE') (CWE ID 611) referring the next code bellow

...

  DocumentBuilderFactory dbf=null;      
  DocumentBuilder db = null;    
  try {         
        dbf=DocumentBuilderFactory.newInstance();  
        dbf.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true); 
        dbf.setExpandEntityReferences(false); 
        dbf.setXIncludeAware(false);        
        dbf.setValidating(false); 
        dbf.newDocumentBuilder();   
        InputStream stream = new ByteArrayInputStream(datosXml.getBytes());
        Document doc = db.parse(stream, "");

...

我一直在研究，但是我还没有找到这个发现的原因或使它消失的方法.你能告诉我怎么做吗?

I've been researching but I haven't found out a reason for this finding or a way of making it disappear.Could you tell me how to do it?

推荐答案

您是否看到过有关XXE的OWASP指南?

您没有禁用应禁用的3个功能.最重要的是第一个:

You are not disabling the 3 features you should disable. Most importantly the first one:

dbf.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
dbf.setFeature("http://xml.org/sax/features/external-general-entities", false);
dbf.setFeature("http://xml.org/sax/features/external-parameter-entities", false);

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