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https://issues.apache.org/struts/browse/WW-2414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rene Gielen updated WW-2414:
----------------------------
Assignee: James Mitchell (was: Rene Gielen)
Closer Award: Just reassigning back to James since he applied the patches to
the trunk, I just backported them to 2.0.x
> Tags <s:url> and <s:a> do not encode URLs
> -----------------------------------------
>
> Key: WW-2414
> URL: https://issues.apache.org/struts/browse/WW-2414
> Project: Struts 2
> Issue Type: Bug
> Components: Plugin - Tags
> Affects Versions: 2.0.11
> Environment: tomcat 6.0.14, jdk 1.6.0_03
> Reporter: Fabio Gandola
> Assignee: James Mitchell
> Priority: Critical
> Fix For: 2.0.11.1, 2.1.1
>
>
> The <s:url> tag does not encode the URL parameters when specified in the
> "action" attribute. This can lead to a possible XSS attack or invalid URLs.
> Moreover, <s:a> does not encode the value in "href" attribute, that can
> create invalid HTML code and XSS attacks.
> This is the original description from Fabio Gandola.
> -------------
> I download the struts2-blank-2.0.11 application.
> I place it in the webapps directory of Tomcat and I execute it. It works.
> I place in example, the file XSS.jsp written this way:
> ______
> <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
> pageEncoding="ISO-8859-1"%>
> <%@ taglib prefix="s" uri="/struts-tags"%>
> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
> "http://www.w3.org/TR/html4/loose.dtd";>
> <html>
> <head>
> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
> <title>Insert title here</title>
> </head>
> <body>
> <s:url id="xssTest" action="test" namespace="/test" encode="true" />
> <s:a href="%{xssTest}">XSS Test</s:a>
> </body>
> </html>
> ______
> I'm setting encode="true". But if I load on Internet Explorer 6:
> http://localhost:8080/struts2-blank-2.0.11/example/XSS.jsp?>'"><script>alert('Hello
> World')</script>
> The javascript is executed.. and this can be used for XSS stuff.
> I looked into the class:
> org.apache.struts2.components.URL
> Revision 595746
> And I don't understand where the encode properties is used.
> Is this the right behaviour of encode attribute?
> EDIT: After doing some more tests, I noticed that I do:
> _____
> <s:url id="xssTest" action="test" namespace="/test" encode="true">
> <s:param name="myvar" value="%{'< > &'}" />
> </s:url>
> <s:a href="%{xssTest}">XSS Test</s:a>
> _____
> The characters < > & are encoded, and so.. this is ok.
> The funny thing is that it happens too if I set encode="false"
> However I think that the fact the passed query string is not encoded.. (or at
> least I have not found a way) can give security problems? or this should be
> checked by the programmer?
> Thank you.
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