CVE-2023-37462
org.xwiki.platform:xwiki-platform-skin-ui Eval Injection vulnerability
Description
### Impact Improper escaping in the document `SkinsCode.XWikiSkinsSheet` leads to a possible privilege escalation from view right on that document to programming rights, or in other words, it is possible to execute arbitrary script macros including Groovy and Python macros that allow remote code execution including unrestricted read and write access to all wiki contents. The attack works by opening a non-existing page with a name crafted to contain a dangerous payload. It is possible to check if an existing installation is vulnerable by opening `<xwiki-host>/xwiki/bin/view/%22%5D%5D%20%7B%7Basync%20async%3D%22true%22%20cached%3D%22false%22%20context%3D%22doc.reference%22%7D%7D%7B%7Bgroovy%7D%7Dprintln(%22Hello%20%22%20%2B%20%22from%20groovy!%22)%7B%7B%2Fgroovy%7D%7D%7B%7B%2Fasync%7D%7D?sheet=SkinsCode.XWikiSkinsSheet&xpage=view` where <xwiki-host is the URL of the XWiki installation. The expected result are two list items with "Edit this skin" and "Test this skin" without any further text. If the installation is vulnerable, the second list item is "Test this skin Hello from groovy!.WebHome"]]". This shows that the Groovy macro has been executed. ### Patches This has been patched in XWiki 14.4.8, 14.10.4 and 15.0-rc-1. ### Workarounds The [fix](https://github.com/xwiki/xwiki-platform/commit/d9c88ddc4c0c78fa534bd33237e95dea66003d29) can also be applied manually to the impacted document `SkinsCode.XWikiSkinsSheet`. ### References * https://jira.xwiki.org/browse/XWIKI-20457 * https://github.com/xwiki/xwiki-platform/commit/d9c88ddc4c0c78fa534bd33237e95dea66003d29 ### For more information If you have any questions or comments about this advisory: * Open an issue in [Jira XWiki.org](https://jira.xwiki.org/) * Email us at [Security Mailing List](mailto:security@xwiki.org)
How to fix CVE-2023-37462
To remediate CVE-2023-37462, upgrade the affected package to a fixed version below.
- —upgrade to 14.4.8 or later
Is CVE-2023-37462 being exploited?
Likely — EPSS is 91.3%, placing CVE-2023-37462 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.