CVE-2024-31981: XWiki Platform: Privilege escalation (PR) from user registration through PDFClass
First published: Wed Apr 10 2024(Updated: )
### 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
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| maven/org.xwiki.platform:xwiki-platform-oldcore | >=15.6-rc-1<15.10-rc-1 | 15.10-rc-1 |
| maven/org.xwiki.platform:xwiki-platform-oldcore | >=15.0-rc-1<15.5.4 | 15.5.4 |
| maven/org.xwiki.platform:xwiki-platform-oldcore | >=3.0.1<14.10.20 | 14.10.20 |
| Xwiki Xwiki | >=3.0.1<14.10.19 | |
| Xwiki Xwiki | >=15.0<15.5.4 | |
| Xwiki Xwiki | >=15.6<15.9 |
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Reference Links
- https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-vxwr-wpjv-qjq7
- https://github.com/xwiki/xwiki-platform/commit/480186f9d2fca880513da8bc5a609674d106cbd3
- https://github.com/xwiki/xwiki-platform/commit/a4ad14d9c1605a5ab957237e505ebbb29f5b9d73
- https://github.com/xwiki/xwiki-platform/commit/d28e21a670c69880b951e415dd2ddd69d273eae9
- https://jira.xwiki.org/browse/XWIKI-21337
- https://nvd.nist.gov/vuln/detail/CVE-2024-31981
- https://github.com/advisories/GHSA-vxwr-wpjv-qjq7 (Advisory)
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