GHSA-xq3r-2qv5-vqqm XWiki Platform has path traversal via resources parameter in ssx and jsx endpoints when using leading slash

• Maven org.xwiki.commons:xwiki-commons-classloader-api: >= 4.2-milestone-2, < 16.10.17 → fixed in 16.10.17 • Maven org.xwiki.commons:xwiki-commons-classloader-api: >= 17.0.0-rc-1, < 17.4.9 → fixed in 17.4.9 • Maven org.xwiki.commons:xwiki-commons-classloader-api: >= 17.5.0, < 17.10.3 → fixed in 17.10.3 • Maven org.xwiki.commons:xwiki-commons-classloader-api: >= 18.0.0-rc-1, < 18.1.0-rc-1 → fixed in 18.1.0-rc-1

Impact It's possible to get access and read configuration files by using URLs such as `http://localhost:8080/bin/ssx/Main/WebHome?resource=/../../WEB-INF/xwiki.cfg&minify=false`. This can apparently be reproduced on Tomcat instances. Patches This has been patched in 18.0.0-rc-1, 17.10.3, 17.4.9, 16.10.17. Workarounds There is no known workaround, other than upgrading XWiki. References • https://jira.xwiki.org/browse/XCOMMONS-3547 • https://github.com/xwiki/xwiki-commons/commit/a979cafd89f6a9c9c0b9ab19744d672df64429bf 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 Attribution The vulnerability was reported by Michał Kołek.