CVE-2023-37462: Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection') in org.xwiki.platform:xwiki-platform-skin-ui
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 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 Email us at Security Mailing List
Other sources
XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. Improper escaping in the document SkinsCode.XWikiSkinsSheet leads to an injection vector 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. See the linked GHSA for instructions on testing an installation. This issue has been patched in XWiki 14.4.8, 14.10.4 and 15.0-rc-1. Users are advised to upgrade. The fix commit d9c88ddc can also be applied manually to the impacted document SkinsCode.XWikiSkinsSheet and users unable to upgrade are advised to manually patch their installations.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
maven/org.xwiki.platform:xwiki-platform-skin-uito a version that resolves this vulnerability.Fixed in 14.10.4 - Upgrade
Upgrade
maven/org.xwiki.platform:xwiki-platform-skin-uito a version that resolves this vulnerability.Fixed in 14.4.8 - Upgrade
Upgrade
org.xwiki.platform:xwiki-platform-skin-uito a version that resolves this vulnerability.Fixed in 14.4.8 - Upgrade
Upgrade
org.xwiki.platform:xwiki-platform-skin-uito a version that resolves this vulnerability.Fixed in 14.10.4 - Upgrade
Upgrade
org.xwiki.platform:xwiki-platform-skin-uito a version that resolves this vulnerability.Fixed in 15.0-rc-1 - Configuration
If you cannot upgrade, apply the fix commit `d9c88ddc4c0c78fa534bd33237e95dea66003d29` manually to the impacted document `SkinsCode.XWikiSkinsSheet`.
XWiki document (impacted): `SkinsCode.XWikiSkinsSheet` Apply fix commit `d9c88ddc4c0c78fa534bd33237e95dea66003d29` manually = true
Event History
Frequently Asked Questions
What is CVE-2023-37462?
CVE-2023-37462 refers to a vulnerability in XWiki Platform that allows for arbitrary code execution.
How does CVE-2023-37462 affect XWiki Platform?
CVE-2023-37462 affects XWiki Platform versions 7.0 to 14.4.8 and 14.5 to 14.10.4, allowing for an injection vector from view right on the document 'SkinsCode.XWikiSkinsSheet' to programming rights.
What is the severity of CVE-2023-37462?
CVE-2023-37462 has a severity rating of 8.8 (Critical).
How can I fix CVE-2023-37462?
To fix CVE-2023-37462, it is recommended to update XWiki Platform to a version that is not affected by the vulnerability.
Where can I find more information about CVE-2023-37462?
You can find more information about CVE-2023-37462 in the XWiki Platform security advisories, the associated GitHub commits, and the XWiki Jira page.