asp.net - "Potentially dangerous Request.RawUrl"的可能原因是什么？

Question

在 asp.net Web 表单应用程序中，我们有时会收到一条错误消息，其中包含“潜在危险的 Request.RawUrl”，但我找不到它的来源。

出现此异常的可能原因是什么？

---

我们案例的一些细节:

Event message: A validation error has occurred

Exception type: System.Web.HttpRequestValidationException

Exception message: A potentially dangerous Request.RawUrl value was 
detected from the client (="..._Combin%20%20%20%20%20%2...").

Request URL: https://somesite/somepage.aspx
?_TSM_HiddenField_=ctl00_sm1_HiddenField
&_TSM_Combin%20</div>%20%20%20%20%20%20%20%20<div%20id=

Stack trace:    at System.Web.HttpRequest.ValidateString(String s, String valueName, String collectionName)
   at System.Web.HttpRequest.get_RawUrl()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest()
   at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context)
   at System.Web.UI.Page.ProcessRequest(HttpContext context)
   at ASP.somepage_aspx.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

我在生成的页面的 html 中识别出带有 TSM_HiddenField 的部分:

<script src="/somepage.aspx?_TSM_HiddenField_=ctl00_sm1_HiddenField&_TSM_CombinedScripts_=
%3b%3bAjaxControlToolkit%2c+Version%3d3.5.11119.20050%2c+Culture%3dneutral%2c
+PublicKeyToken%3d28f01b0e84b6d53e%3ada-DK%3a8e147239-dd05-47b0-8fb3-f743a139f982
%3ae2e86ef9%3a1df13a87%3a8ccd9c1b%3ac4c00916%3a9ea3f0e2%3a9e8e87e9
%3a4c9865be%3aba594826%3ac76f1358" type="text/javascript"></script> 

...所以本例中似乎与AjaxControlToolkit有关，但是这个异常怎么会发生呢？

(它发生在用户登录时，所以我怀疑是否涉及一些爬虫或黑客尝试......)

Answer 1

看起来您在提交的表单字段中有 HTML 标记，可能是这个:

&_TSM_Combin%20</div>%20%20%20%20%20%20%20%20<div%20id=

<div>罪魁祸首就是他。