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https://issues.apache.org/jira/browse/WICKET-4427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13216033#comment-13216033
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Peter Ertl commented on WICKET-4427:
------------------------------------
I agree this is a bug that needs a quick fix, as a workaround in the meantime I
recommend anybody readying this ticket to use
org.apache.wicket.markup.html.SecurePackageResourceGuard
which does by default 'deny all' and is a lot more secure anyway.
> possible to bypass PackageResourceGuard
> ---------------------------------------
>
> Key: WICKET-4427
> URL: https://issues.apache.org/jira/browse/WICKET-4427
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.4.18
> Reporter: Sebastiaan van Erk
> Assignee: Martin Grigorov
> Fix For: 1.4.20, 1.5.5, 6.0.0
>
> Attachments: wicket-4427.zip
>
>
> It is possible to bypass the filters in the PackageResourceGuard by adding
> %10, %13, or %20 to the end of the url, i.e.,
> http://my.site.com/myapp/mounted_package/myfile.properties%20
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