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GHSA-gx6h-936c-vrrr
No affected components available
Impact
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:
- the wiki must be open to registration for anyone
- the wiki must be closed to view for Guest users (more specifically the XWiki.Registration page must be forbidden in View for guest user)
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.
Patches
The issue is patched in versions 12.10.11, 14.0-rc-1, 13.4.7, 13.10.3.
Workarounds
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.
References
https://jira.xwiki.org/browse/XWIKI-19291
For more information
If you have any questions or comments about this advisory:
- Open an issue in Jira XWiki
- Email us at security mailing list
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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