我们正在使用veracode对代码进行安全性分析,并在下面的代码中显示XXE缺陷,特别是在调用Deserialize()的情况下.我们如何防止序列化程序访问外部实体.我在下面尝试将XMLresolver的XMLresolver设置为null无法正常工作.
public static T DeserializeObject(string xml, string Namespace)
{
System.Xml.Serialization.XmlSerializer serializer = new System.Xml.Serialization.XmlSerializer(typeof(T), Namespace);
MemoryStream stream =
new MemoryStream(Encoding.Default.GetBytes(xml));
XmlReaderSettings settings = new XmlReaderSettings();
// allow entity parsing but do so more safely
settings.DtdProcessing = DtdProcessing.Ignore;
settings.XmlResolver = null;
using (XmlReader reader = XmlReader.Create(stream, settings))
{
return serializer.Deserialize(reader) as T;
}
}
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任何人都可以建议我可能会缺少什么或者是否还有其他事情要尝试.