GHSA-42fc-7w97-8vrc XWiki PlantUML Macro Vulnerable to Server-Side Request Forgery (SSRF) via 'server' parameter

• Maven org.xwiki.contrib.plantuml:macro-plantuml-macro: < 2.4.1 → fixed in 2.4.1

Impact The PlantUML Macro is vulnerable to Server-Side Request Forgery (SSRF). The macro allows users to specify an alternative PlantUML server via the `server` parameter. However, the application does not validate the supplied URL. An attacker can supply an internal IP address or a malicious external URL. The XWiki server will attempt to connect to this URL to "render" the diagram. This issue affects all versions of the Plant UML Macro extension till version 2.4 included. Patches Version 2.4.1 of the Plant UML Macro extension fixes the issue by verifying if the supplied server domain matches one of the trusted domain configured inside of XWiki. Workarounds Protect the XWiki server by placing it in a DMZ so that it cannot access any other internal servers. Resources The issue was fixed in PLANTUML-25 by the commit c8b19bda93058794e04c8862fc7ca85c59b5fe5c. For more information If there are any questions or comments about this advisory: • Open an issue in JIRA XWiki.org • Send an email to Security Mailing List Attribution The issue was reported by Łukasz Rybak.