Web Forms :: Link Button Submit - Potentially Harmful Request
Jan 28, 2011
in asp.net link buttons behave like a submit button. how can we prevent it form behaving like a submit button. for example:- you can take a from formname.aspx and set ValidateRequest="false". take two text box and a button and two submit button; set Response.redirect of 1st link button to fromname.aspx and for second set to another page. now enter text in text box like<> or something like this, click on 1st link button it's working now click on 2nd link button it will give error that "Potentially harmful request. and you can also check the post request using firebug's net panel that what is sending in request.
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Mar 12, 2010
I have aproblem that when i add some special character in the textbox and submit the page it give error. A potentially dangerous Request.Form value was detected from the client (ctl00$ContentPlaceHolder1$txtname="<test>"). I found the solution of this porblem by ValidateRequest="false". But if i do this then the request will not be validate and then attacks probablity will be increase. what should i do to for this whithout using ValidateRequest attribute.
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Oct 12, 2010
I have a form that a user fills out and can input html or other text into a textarea. I have the validaterequest attribute set to false on the page. However, when I submit the form with any html characters it bombs saying that it detected the potentially dangerous request field and to make validaterequest=false. I've already done this so I'm not sure why it's not working. I've done this many times before and never had this problem. Anyone run into this before and if so, is there a fix? I don't want to update my web.config and apply it site wide.
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Jul 27, 2010
(probably a bot) sent a request with the following URL to my ASP.NET 4.0 web forms application (running on IIS 7.0):http://ipaddress-of-my-applications-domain/bla1.bla2.bla3.bla4.bla5:)This caused an System.Web.HttpException. I received a logging email from ASP.NET HealthMonitoring I had configured, telling me:A potentially dangerous Request.Path value was detected from the client (:).
System.Web.HttpRequest.ValidateInputIfRequiredByConfig()
System.Web.HttpApplication.PipelineStepManager.ValidateHelper(HttpContext context)
Why is a colon in the URL "potentially dangerous"? What dangerous things can be done with such a URL? Do I have any security hole here I am not aware of?
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Jun 23, 2010
On a windows 2008 web server, I get the following error whenever posting a form containing html tags in textboxes:
A potentially dangerous Request.Form value was detected from the client (widget$txtText="
This is a common error and you fix it by either doing Page ValidateRequest = false or in the web.config with pages validaterequest = false. However, on this specific server, it completely ignores the validaterequest = false and throws this exception anyway. Has anyone seen this behavior before and know what else I can do to prevent this error? I've seen it in 2 web apps now on the same server, it's really weird.
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Feb 24, 2010
I have contact form on my website - but when somebody write html tags in this form or any other form he sees error website:
A potentially dangerous Request.Form value was detected in ASP.NET MVC
On this site:
http://www.coderjournal.com/2009/02/potentially-dangerous-requestform-detected-aspnet-mvc/
somebody writes that we should use [Code]....
[Code]....
[Code]....
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Mar 7, 2011
I am Getting this error
A potentially dangerous Request.Form value was detected from the client (ctl00$ContentPlaceHolder1$txtEmbed="<embed src='http://a...").
when i am opening a modalpopup extender on link button click and in code behind i am assigning the textbox
value="<embed src='http://auddia.com/player-viral.swf' height='20' width='200' allowscriptaccess='always' flashvars='volume=100&autostart=false&file=http://auddia.com/Audios/audioStream_1299222864888_19.flv&plugins=viral-1d'/>
and also i set the ValidateRequest="false" in the page directive's. and in code behind i also use HttpUtility.HtmlEncode . but again and again i am facing this error
"A potentially dangerous Request.Form value was detected from the client (ctl00$ContentPlaceHolder1$txtEmbed="<embed src='http://a...").".
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Jun 2, 2010
I have one asp.net application, which has some problems while i am entering the special characters such as ": &#, " in the search box. If i enter this text in search box, i got the exception like this. A potentially dangerous Request.Form value was detected from the client (txtValue=": &#, ").
then i searched on the net, i got one general solution for this that to set the validaterequest to false. But no changes has been made on my application.
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Feb 10, 2011
In the load event of a web user control I have the following code which I am using to call a function in order to populate a HTML Text Area.The page hosting the control loads fine the first time it loads but on postback it throws the error
Quote:System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client
I have seen people suggest <%@ Page ... validateRequest="false" %>
Firstly I would like to handle this at control level rather than on the hosting page .
Code:
if (!Page.ClientScript.IsStartupScriptRegistered("AddText"))
{
Page.ClientScript.RegisterStartupScript [code]....
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Mar 31, 2010
I'm writing a product management system for a website. As an administrator defines product details, those details are stored in the Session so that fields remain populated as the user navigates across multiple pages. One of these fields is a "RichTextBox" that allows the user to define a product description with rich text.
Attempting to pack the contents of this rich text box into a Session variable raises the following Server Error:
A potentially dangerous Request.Form value was detected from the client (ctl00_ContentPlaceHolder1_RichTextBox1_tbxRichContent="<b>asdf</b>").
The offending line of code is as follows:
Session["NewProductDescription"] = HttpUtility.HtmlEncode(RichTextBox1.Text);
I thought HtmlEncoding would solve the problem, but it did not.
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Mar 26, 2010
[Update : I have inserted this post in "XML Web Services" section by mistake, so if you are a moderator or Admin, please shift it to "Security" section or any other relevant section]
I am working with WCF REST Service Application in .Net 4.0 and my service is hosted on II7 (Windows 7 Ultimate - 64 bit).My service and all other code is working completely fine.But when I use the '&' character in request url, it shows the following Error.I have already tried adding following section in my web.config as shown here on www.asp.net
<system.web>
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Sep 29, 2010
I have an ashx handler that was working fine in VS2008 but when I upgraded to VS2010 (haven't gone back to VS2008 to double check though) and when I try to grab the value from HttpContext.Request.Params["update"] I get the following error:
+ ex {"A potentially dangerous Request.QueryString value was detected from the client (update="<SETIProducts><Produ...")."}
System.Exception {System.Web.HttpRequestValidationException}
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May 24, 2010
I am using Webhandler to upload images to the server. I want to send the folder name so on that folder the images will save. I am using this URI format and got the below error.
builder.Path = builder.Path.TrimEnd('/')
+ "/Services/FileReceiver.ashx?foldername=" +
folder;
this.Uri
= builder.Uri;
Also I added the following line in the web.config but still having the issue.
<httpRuntime requestValidationMode="2.0" />
A potentially dangerous Request.Path value was detected from the client (?). Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Web.HttpException: A potentially dangerous Request.Path value was detected from the client (?).
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack
Trace:
[HttpException (0x80004005): A potentially dangerous Request.Path value was detected from the client (?).]
System.Web.HttpRequest.ValidateInputIfRequiredByConfig() +8884233
System.Web.ValidateRequestExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +35
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184
Version
Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1
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Jun 25, 2010
I have an app that was originally running fine in ASP.Net 3.5, using the ValidateRequest set to false to allow HTML to be saved from a rich text box. However, after converting the app to 4.0, I am getting the Potentially Dangerous message, even though both the page and web.config have the value set to false.
I went into the page and created a PagesSection object and checked its value and then set the value to false. Everytime the page is hit (postback or new) the value is always returned as true, until I set it to false. Not sure why it is reverting to true.
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Mar 1, 2011
I need to change a standard HTML Input button to a Link button but am running into problems because the existing
code calls a javascript function. The function basically does the same as the browser back button. When I add the code and
set the property runat="server" I get a "CS1026: ) expected".
Quite new to ASP,net (VS2010) so could be going about this the wrong way.
[Code]....
[Code]....
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Sep 28, 2010
I am writing a database to store code extracts which will make our life easier at work, I have a text box which retrieves HTML characters, I have no problems in displaying them, however if I click the edit button to amend text I get the error "A potentially danger Request.Form value was detected from the client (txtCodeExtract=" etc").
I have added ValidateRequest="False" to the main form however, when I now click the edit button the textbox wipes out all the text.
I have tried using the Server.HTMLEncode(txtCodeExtracts.Text); or Decode and HttpUtility.HTMLEncode or Decode but the textbox still clears.
This is a web app using Visual Studio 2008
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May 17, 2010
In C#/Asp.net I have 2 submit button i.e.
btnOk and btn_Submit
Initially I am doing validating form by clicking on btnOK and in btn_Submit I am inserting record into table. I again want to call btn_Ok event in btn_Submit click event for re-checking validation, if it validates properly thne rest of code of btn_submit should work.
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Aug 16, 2010
I'm using a php script to http post some xml files to a .net URL.
When I submit I get the response:
A potentially dangerous Request.Form
value was detected from the client
(<?xml version="...UTF-8"?> <!DOCTYPE
cXML SYSTE...").
Description: Request Validation has detected a potentially dangerous client input value, and
processing of the request has been aborted. This value may indicate an attempt to compromise the security of your application, such as a cross-site scripting attack. You can disable request validation by setting validateRequest=false in the Page directive or in the configuration section. However, it is strongly recommended that your application explicitly check all inputs in this case.
As I'm not using .NET I can't set ValidateRequest="false" in web.config.
Do I need to sanitize my xml before submitiing? How can I do this?
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May 3, 2010
I know the < and > characters will cause this error, but what other characters/inputs will cause this error?
I'm testing for this error in the Global.asax, and reridrecting to an error page where I want to list all possible values which cause this error, so the user can go back to their page and get rid of them.
I've done some googling, but all I see so far are the < and > characters...surely there are more out there.
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Nov 23, 2010
To prevent my application from crashing with the error "A potentially dangerous Request.Form value was detected...", I just turned page validation off. I want to revisit this and solve it correctly. Is there a good strategy for this? If people are entering '<' and '>', I think the only way to save their data is to encode it via Javacript. I have tried catching it in the code-behind, but it becomes too late. I am thinking of inheriting the textbox and auto encode/decode the input with client scripts. I also have to think of all the angle brackets that are already saved in my database.
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Jul 7, 2010
I'm testing a Tiny_MCE plugin for BlogEngine.NET extension I wrote earlier and I keep receiving the following error message whenever I use my own extension or the extremely popular SyntaxHighlighter extension which both have similar behaviors and both implement Tiny_MCE plugins:
Url :
'http://localhost/admin/Pages/Add_entry.aspx'
Raw Url : /admin/Pages/Add_entry.aspx[code]...
My question is thus: although I receive this error on my local environment (IIS 7.5 ASP.NET 4.0 Integrated App Pool) I receive no error whatsoever on my live environment (IIS 7.5 ASP.NET 3.5 SP1/ 3.0 / 2.0.) Additionally whenever I test the extension using debug mode in Visual Studio 2010 and run the site off of a separate instance I don't receive this error.I'm almost certain that the fact that this issue only occurs on my localhost IIS instance indicates that it's a configuration issue or a behavior specific to ASP.NET 4.0, but I don't know what exactly.
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Feb 12, 2010
I have 2 SUBMIT button in a form one is display:hidden and one is display:block if user click on SUBMIT button (display:block) then another SUBMIT button {display:hidden} should also submitted.
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Jan 4, 2011
In ASP.NET when we have multiple input section with required field validator (Like on header for login with userid & Password is required and second on footer for subscription) when we click on subscription login section's userid required field validator activates and say userid required & i can not submit subscription.
when i submit subscription details login section should not have concern with this. how to avoid this conflicts.
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Jan 12, 2010
I am trying to make a web request programmatically. When i submit the request through the browser it seems to work fine but when i programmatically submit the request it comes back with this error message "Unable to connect to the remote server"
Below is the code i am using to executing the command,
[Code]....
[Code]....
I assume the reason why i am getting the error message is because the proxy server has not been set programmatically. Can somebody tell me how i can get the proxy server and set it programmatically?
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Mar 2, 2011
Here is my requirement -
1. I need to load a user control on link click event of a link button during postback of aspx page.
2. On button click event of a save button on that aspx page, I need to read the selected values from that user control on further postback.
If I write the loadcontrol code in link_click event, the control is not recognized at all in the button_click event. When I shift it to page_init and execute only during not postback, the user control loads with default values.
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