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Posted to dev@sling.apache.org by "Carsten Ziegeler (JIRA)" <ji...@apache.org> on 2013/07/19 08:50:49 UTC

[jira] [Resolved] (SLING-2974) XSS vulnerability in AbstractAuthenticationFormServlet

     [ https://issues.apache.org/jira/browse/SLING-2974?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Carsten Ziegeler resolved SLING-2974.
-------------------------------------

    Resolution: Fixed

I've added XML escaping with revision 1504776 - although it should not be required to check the context path, I added the escaping to all variables.

                
> XSS vulnerability in AbstractAuthenticationFormServlet
> ------------------------------------------------------
>
>                 Key: SLING-2974
>                 URL: https://issues.apache.org/jira/browse/SLING-2974
>             Project: Sling
>          Issue Type: Bug
>          Components: Authentication
>    Affects Versions: Auth Core 1.1.2
>            Reporter: Julian Sedding
>            Assignee: Carsten Ziegeler
>             Fix For: Auth Core 1.1.4
>
>
> The AbstractAuthenticationFormServlet replaces placeholders in an HTML page with user-provided input without taking care of proper escaping of the input. Hence it is possible to construct an XSS-attack exploiting this servlet.
> This is made worse by the fact that this servlet doesn't provide an obvious way to disable it. Setting the sling.servlet.path="-" using content based configuration did the trick in my case, however.

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