GHSA-r279-47wg-chpr XWiki allows RCE from script right in configurable sections

• Maven org.xwiki.platform:xwiki-platform-administration-ui: >= 2.3, < 15.10.9 → fixed in 15.10.9 • Maven org.xwiki.platform:xwiki-platform-administration-ui: >= 16.0.0-rc-1, < 16.3.0 → fixed in 16.3.0

Impact Any user with script rights can perform arbitrary remote code execution by adding instances of `XWiki.ConfigurableClass` to any page. This compromises the confidentiality, integrity and availability of the whole XWiki installation. To reproduce on a instance, as a user with script rights, edit your user profile and add an object of type `XWiki.ConfigurableClass` ("Custom configurable sections"). Set "Display in section" and "Display in category" to `other`, "Scope" to `Wiki and all spaces` and "Heading" to: ``` set($codeToExecute = 'Test') #set($codeToExecuteResult = '{{async}}{{groovy}}services.logging.getLogger("attacker").error("Attack from Heading succeeded!"){{/groovy}}{{/async}}') ``` Save the page and view it, then add `?sheet=XWiki.AdminSheet&viewer=content&section=other` to the URL. If the logs contain "attacker - Attack from Heading succeeded!", then the instance is vulnerable. Patches This has been patched in XWiki 15.10.9 and 16.3.0. Workarounds We're not aware of any workaround except upgrading. References • https://jira.xwiki.org/browse/XWIKI-21207 • https://github.com/xwiki/xwiki-platform/commit/8493435ff9606905a2d913607d6c79862d0c168d 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