| Package | Affected versions | Patched versions |
|---|---|---|
| org.xwiki.platform:xwiki-platform-oldcore | ≥ 15.0-rc-1, < 15.5.4≥ 15.6-rc-1, < 15.10-rc-1≥ 3.0.1, < 14.10.20 | 15.5.415.10-rc-114.10.20 |
| xwiki | ≥ 15.0, < 15.5.4≥ 15.6, < 15.9≥ 3.0.1, < 14.10.19 | 15.5.415.914.10.19 |
Remote code execution is possible via PDF export templates.
To reproduce on an installation, register a new user account with username PDFClass if XWiki.PDFClass does not exist.
On XWiki.PDFClass, use the class editor to add a "style" property of type "TextArea" and content type "Plain Text".
Then, add an object of class PDFClass and set the "style" attribute to $services.logging.getLogger('PDFClass').error("I got programming: $services.security.authorization.hasAccess('programming')").
Finally, go to <host>/xwiki/bin/export/Main/WebHome?format=pdf&pdftemplate=XWiki.PDFClass. If the logs contain "ERROR PDFClass - I got programming: true", the instance is vulnerable.
This vulnerability has been patched in XWiki 14.10.20, 15.5.4 and 15.10-rc-1.
If PDF templates are not typically used on the instance, an administrator can create the document XWiki.PDFClass and block its edition, after making sure that it does not contain a style attribute.
Otherwise, the instance needs to be updated.
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