CVE-2024-31981: XWiki Platform: Privilege escalation (PR) from user registration through PDFClass
Impact 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.
Patches This vulnerability has been patched in XWiki 14.10.20, 15.5.4 and 15.10-rc-1.
Workarounds 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.
References - https://jira.xwiki.org/browse/XWIKI-21337 - https://github.com/xwiki/xwiki-platform/commit/d28e21a670c69880b951e415dd2ddd69d273eae9
Other sources
XWiki Platform is a generic wiki platform. Starting in version 3.0.1 and prior to versions 4.10.20, 15.5.4, and 15.10-rc-1, remote code execution is possible via PDF export templates. 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, there are no known workarounds aside from upgrading.
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Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2024-31981?
CVE-2024-31981 has a high severity rating due to the potential for remote code execution via PDF export templates.
How do I fix CVE-2024-31981?
To fix CVE-2024-31981, update to XWiki version 15.10-rc-1, 15.5.4, or 14.10.20.
What types of software are affected by CVE-2024-31981?
CVE-2024-31981 affects various versions of XWiki, specifically those between 3.0.1 to 15.10-rc-1.
Can I reproduce CVE-2024-31981 to test if my system is vulnerable?
Yes, you can reproduce CVE-2024-31981 by registering a new user with the username 'PDFClass' and adding a 'style' property in the class editor.
What potential impact does CVE-2024-31981 have on my system?
The impact of CVE-2024-31981 includes unauthorized remote code execution, potentially leading to a complete system compromise.