xwiki-platform-web-templates allows users to be created even when registration is disabled without validation via template macro

Impact

If a guest has view rights on any document, it’s possible to create a new user using the distribution/firstadminuser.wiki in the wrong context.

To reproduce:

• On a wiki with view rights for guests but user registration disabled, open as guest <server>/xwiki/bin/view/Main?sheet=CKEditor.HTMLConverter&language=en&sourceSyntax=xwiki%2F2.1&stripHTMLEnvelope=true&fromHTML=false&toHTML=true&text=%7B%7Btemplate+name%3D%22distribution%2Ffirstadminuser.wiki%22+%2F%7D%7D where <server> is the URL of your XWiki installation.
• Enter username and password of your choice.
• Click “Register and login”

Patches

The vulnerability has been patched in XWiki 15.0-rc-1 and 14.10.1.

Workarounds

There is no known workaround other than upgrading.

References

https://jira.xwiki.org/browse/XWIKI-19852
https://jira.xwiki.org/browse/XWIKI-20400

For more information

If you have any questions or comments about this advisory:

• Open an issue in Jira XWiki.org
• Email us at Security Mailing List