We found a possible XSS vector in the registerinline.vm
template related to the xredirect
hidden field.
This template is only used in the following conditions:
A way to obtain the second condition is when administrators checked the “Prevent unregistered users from viewing pages, regardless of the page rights” box in the administration rights.
The issue is patched in versions 12.10.11, 14.0-rc-1, 13.4.7, 13.10.3.
There are two main ways for protecting against this vulnerability, the easiest and the best one is by applying a patch in the registerinline.vm
template, the patch consists in checking the value of the xredirect field to ensure it matches the following:
<input type="hidden" name="xredirect" value="$escapetool.xml($!request.xredirect)" />
If for some reason it’s not possible to patch this file, another workaround is to ensure “Prevent unregistered users from viewing pages, regardless of the page rights” is not checked in the rights and apply a better right scheme using groups and rights on spaces.
https://jira.xwiki.org/browse/XWIKI-19291
If you have any questions or comments about this advisory: