CVE-2023-37908: org.xwiki.rendering:xwiki-rendering-xml Improper Neutralization of Invalid Characters in Identifiers in Web Pages vulnerability
First published: Wed Oct 25 2023(Updated: )
### Impact The cleaning of attributes during XHTML rendering, introduced in version 14.6-rc-1, allowed the injection of arbitrary HTML code and thus cross-site scripting via invalid attribute names. This can be exploited, e.g., via the link syntax in any content that supports XWiki syntax like comments in XWiki: ``` [[Link1>>https://XWiki.example.com||/onmouseover="alert('XSS1')"]] ``` When a user moves the mouse over this link, the malicious JavaScript code is executed in the context of the user session. When this user is a privileged user who has programming rights, this allows server-side code execution with programming rights, impacting the confidentiality, integrity and availability of the XWiki instance. While this attribute was correctly recognized as not allowed, the attribute was still printed with a prefix `data-xwiki-translated-attribute-` without further cleaning or validation. Note that while versions below 14.6 are not vulnerable to this particular vulnerability, they are still vulnerable to XSS through attributes in XWiki syntax, see [the corresponding advisory](https://github.com/xwiki/xwiki-rendering/security/advisories/GHSA-6gf5-c898-7rxp). ### Patches This problem has been patched in XWiki 14.10.4 and 15.0 RC1 by removing characters not allowed in data attributes and then validating the cleaned attribute again. ### Workarounds There are no known workarounds apart from upgrading to a version including the fix. ### References * https://jira.xwiki.org/browse/XRENDERING-697 * https://github.com/xwiki/xwiki-rendering/commit/f4d5acac451dccaf276e69f0b49b72221eef5d2f ### For more information If you have any questions or comments about this advisory: * Open an issue in [Jira XWiki](https://jira.xwiki.org/) * Email us at [XWiki Security mailing-list](mailto:security@xwiki.org)
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Xwiki Xwiki-rendering | >=14.6<14.10.4 | |
| maven/org.xwiki.rendering:xwiki-rendering-xml | >=14.6-rc-1<14.10.4 | 14.10.4 |
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Reference Links
- https://github.com/xwiki/xwiki-rendering/security/advisories/GHSA-663w-2xp3-5739
- https://github.com/xwiki/xwiki-rendering/security/advisories/GHSA-6gf5-c898-7rxp
- https://github.com/xwiki/xwiki-rendering/commit/f4d5acac451dccaf276e69f0b49b72221eef5d2f
- https://jira.xwiki.org/browse/XRENDERING-697
- https://nvd.nist.gov/vuln/detail/CVE-2023-37908
- https://github.com/advisories/GHSA-663w-2xp3-5739 (Advisory)
Frequently Asked Questions
What is the vulnerability ID of this security issue?
The vulnerability ID of this security issue is CVE-2023-37908.
What is the impact of this vulnerability?
The impact is the injection of arbitrary HTML code and cross-site scripting via invalid attribute names.
Which software is affected by this vulnerability?
The software affected by this vulnerability is org.xwiki.rendering:xwiki-rendering-xml.
What is the recommended version to fix this vulnerability?
The recommended version to fix this vulnerability is 14.10.4.
What is the severity rating of this vulnerability?
The severity rating of this vulnerability is critical with a CVSS score of 9.1.
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