CVE-2024-21650
XWiki Remote Code Execution Vulnerability via User Registration
Description
### Impact XWiki is vulnerable to a remote code execution (RCE) attack through its user registration feature. This issue allows an attacker to execute arbitrary code by crafting malicious payloads in the "first name" or "last name" fields during user registration. This impacts all installations that have user registration enabled for guests. To reproduce, register with any username and password and the following payload as "first name": `]]{{/html}}{{async}}{{groovy}}services.logging.getLogger("attacker").error("Attack succeeded){{/groovy}}{{/async}}`. In the following page that confirms the success of the registration, the full first name should be displayed, linking to the created user. If the formatting is broken and a log message with content "ERROR attacker - Attack succeeded!" is logged, the attack succeeded. ### Patches This vulnerability has been patched in XWiki 14.10.17, 15.5.3 and 15.8 RC1. ### Workarounds In the administration of your wiki, under "Users & Rights" > "Registration" set the "Registration Successful Message" to the following code: ```velocity #set($message = $services.localization.render('core.register.successful', 'xwiki/2.1', ['USERLINK', $userName])) #set($userLink = $xwiki.getUserName("$userSpace$userName")) {{info}}$message.replace('USERLINK', "{{html clean=false}}$userLink{{/html}}"){{/info}} ``` ### References * https://jira.xwiki.org/browse/XWIKI-21173 * https://github.com/xwiki/xwiki-platform/commit/b290bfd573c6f7db6cc15a88dd4111d9fcad0d31
How to fix CVE-2024-21650
To remediate CVE-2024-21650, upgrade the affected package to a fixed version below.
- —upgrade to 14.10.17 or later
Is CVE-2024-21650 being exploited?
Likely — EPSS is 92.5%, placing CVE-2024-21650 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.