GHSA-rr6p-3pfg-562j XWiki Platform allows remote code execution as guest via SolrSearchMacros request

• Maven org.xwiki.platform:xwiki-platform-search-solr-ui: >= 5.3-milestone-2, < 15.10.11 → fixed in 15.10.11 • Maven org.xwiki.platform:xwiki-platform-search-solr-ui: >= 16.0.0-rc-1, < 16.4.1 → fixed in 16.4.1

Impact Any guest can perform arbitrary remote code execution through a request to `SolrSearch`. This impacts the confidentiality, integrity and availability of the whole XWiki installation. To reproduce on an instance, without being logged in, go to `/xwiki/bin/get/Main/SolrSearch?media=rss&text=%7D%7D%7D%7B%7Basync%20async%3Dfalse%7D%7D%7B%7Bgroovy%7D%7Dprintln%28"Hello%20from"%20%2B%20"%20search%20text%3A"%20%2B%20%2823%20%2B%2019%29%29%7B%7B%2Fgroovy%7D%7D%7B%7B%2Fasync%7D%7D%20`. If there is an output, and the title of the RSS feed contains `Hello from search text:42`, then the instance is vulnerable. Patches This vulnerability has been patched in XWiki 15.10.11, 16.4.1 and 16.5.0RC1. Workarounds This line in `Main.SolrSearchMacros` can be edited to match the `rawResponse` macro defined here with a content type of `application/xml`, instead of simply outputting the content of the feed. References • https://jira.xwiki.org/browse/XWIKI-22149 • https://github.com/xwiki/xwiki-platform/commit/67021db9b8ed26c2236a653269302a86bf01ef40 Attribution This vulnerability has been reported by John Kwak for Trend Micro's Zero Day Initiative.