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POBuild "exit" page using Classic ASP avoiding major Cross Site Scripting pitfalls
 

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  1. POBuild "exit" page using Classic ASP avoiding major Cross Site Scripting pitfalls
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    <p>I'm working on updating a classic ASP web page used by a number of sub-sites maintained at the company I work for.</p> <p>The purpose of the page is to notify the user that they are leaving "our" site and going to another site. It's basically a disclaimer, but due to resource limitations and time limitations I can't add the disclaimer to every site we manage.</p> <p>This is the crux of the problem. The current code pulls a variable from the query string to create the "continue" link in the new window. This obviously creates many problems in the form of cross site scripting.</p> <p>How do I approach this update to eliminate most (if not all) of the cross site scripting issues using vbScript/ASP.</p> <p>The code I'm using is below.</p> <pre><code>&lt;%@ Language = vbScript %&gt; &lt;% Option Explicit %&gt; &lt;% Dim strLink strLink = Request.QueryString("site") strLink = Replace(strLink, "&lt;", "&amp;lt") strLink = Replace(strLink, "&gt;", "&amp;gt;") strLink = Replace(strLink, chr(34), "") strLink = Replace(strLink, "script", "", 1, -1, 1) strLink = Replace(strLink, "onclick", "", 1, -1, 1) strLink = Replace(strLink, "ondblclick", "", 1, -1, 1) strLink = Replace(strLink, "onmousedown", "", 1, -1, 1) strLink = Replace(strLink, "onmouseover", "", 1, -1, 1) strLink = Replace(strLink, "onmousemove", "", 1, -1, 1) strLink = Replace(strLink, "onmouseout", "", 1, -1, 1) strLink = Replace(strLink, "onkeypress", "", 1, -1, 1) strLink = Replace(strLink, "onkeydown", "", 1, -1, 1) strLink = Replace(strLink, "onkeyup", "", 1, -1, 1) strLink = Replace(strLink, "onfocus", "", 1, -1, 1) strLink = Replace(strLink, "onblur", "", 1, -1, 1) strLink = Replace(strLink, "&amp;&amp;", "") strLink = Replace(strLink, "##", "") strLink = Replace(strLink, "&amp;#", "") %&gt; &lt;a href="&lt;%= strLink %&gt;"&gt;Continue&lt;/a&gt; </code></pre>
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    1. COIf the link is already on your site, why would you need to sanitize it?
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      1. USDiodeus - James MacFarlane
    2. COThe problem isn't that the links we add are "bad" it's that we need a gateway page that will accept ANY URL passed in and then provide the needed disclaimer and forward the user along if they continue with the action of leaving the site. (It's a financial site so lot's of disclaimers and legal "stuff" to deal with). So the overall issue is that anyone can pass a URL (or "bad" script) to the page and potentially create an XSS problem.
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