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07/03/2003 at 10:37PM PDT, ID: 20668376
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5.8

Stripping out html tags / Security

Asked by bradderick in ColdFusion Application Server

Tags: html, coldfusion, tags, out, stripping

Hi All,

I am currently building an auction website in coldfusion.

The user can input various things like location, title etc for their auction. One of the things that I am having a bit of trouble with, security-wise, is the BODY text.

So when they add their classified they have a textarea that they can type their body text into.

Now, having done a little bit of expermintation pasting different stuff in there, it seems that HTML is accepted as basically it just pastes the whole field (it is a TEXT type field in MSSQL server) straight into the final 'auction-detail' page that the user views.

There are several problems here as far as security goes, like I think i need to strip out certain tags. For example, if one puts in a <body bgcolor="black"> tag then the entire page has a black background and the text up the top cannot be read.

I was thinking their may be security flaws there as far as javascript goes as well. I imagine they could probably NOT pass coldfusion tags in as these would go in after the server has run through tags. Am i incorrect here? Could they put in CF tags and compromise security?

So, what is the best way to strip out the dangerous tags and what are the tags in question, while still allowing the user to pretty up their auction text a little?

On the other hand, i have been toying with the idea of making several buttons along the side of the textarea, [background colour], [text colour], [bold] [italics] etc etc and then just implementing these if the person selects text in the text area and clicks the button. This would be in some kind of language, just created for this purpose that would allow this stuff in the translation process to be turned into usable html.

Help and code would be great. Thanks for your time!

Cheers,
BradView the Solution FREE for 7 Days
[+][-]07/04/03 02:30 AM, ID: 8855334

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About this solution

Zone: ColdFusion Application Server
Tags: html, coldfusion, tags, out, stripping
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Solution Provided By: crosenblum
Participating Experts: 5
Solution Grade: A
 
 
[+][-]07/07/03 12:35 PM, ID: 8871737

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