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Security Advisories: GSA_kwCzR0hTQS1tM2pyLWN2aGotZjM1as4AAyu0

org.xwiki.commons:xwiki-commons-xml Cross-site Scripting vulnerability

Impact

The "restricted" mode of the HTML cleaner in XWiki, introduced in version 4.2-milestone-1, only escaped <script> and <style>-tags but neither attributes that can be used to inject scripts nor other dangerous HTML tags like <iframe>. As a consequence, any code relying on this "restricted" mode for security is vulnerable to JavaScript injection ("cross-site scripting"/XSS). An example are anonymous comments in XWiki where the HTML macro filters HTML using restricted mode:

{{html}}
<a href='' onclick='alert(1)'>XSS</a>
{{/html}}

When a privileged user with programming rights visits such a comment in XWiki, the malicious JavaScript code is executed in the context of the user session. This allows server-side code execution with programming rights, impacting the confidentiality, integrity and availability of the XWiki instance.

Patches

This problem has been patched in XWiki 14.6 RC1 with the introduction of a filter with allowed HTML elements and attributes that is enabled in restricted mode.

Workarounds

There are no known workarounds apart from upgrading to a version including the fix.

References

• https://github.com/xwiki/xwiki-commons/commit/b11eae9d82cb53f32962056b5faa73f3720c6182 - the patch with the filter
• https://github.com/xwiki/xwiki-commons/commit/4a185e0594d90cd4916d60aa60bb4333dc5623b2 - the patch with the definitions what is allowed
• https://jira.xwiki.org/browse/XWIKI-9118 - the security issue with the HTML macro
• https://jira.xwiki.org/browse/XCOMMONS-1680 - the issue regarding a definition of what is allowed HTML
• https://jira.xwiki.org/browse/XCOMMONS-2426 - the issue regarding the filter that fixes the security issue

For more information

If you have any questions or comments about this advisory:

• Open an issue in Jira XWiki
• Email us at XWiki Security mailing-list

Permalink: https://github.com/advisories/GHSA-m3jr-cvhj-f35j
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1tM2pyLWN2aGotZjM1as4AAyu0
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Critical
Classification: General
Published: about 1 year ago
Updated: about 1 year ago

CVSS Score: 9.1
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Identifiers: GHSA-m3jr-cvhj-f35j, CVE-2023-29201
References:

• https://github.com/xwiki/xwiki-commons/security/advisories/GHSA-m3jr-cvhj-f35j
• https://github.com/xwiki/xwiki-commons/commit/4a185e0594d90cd4916d60aa60bb4333dc5623b2
• https://github.com/xwiki/xwiki-commons/commit/b11eae9d82cb53f32962056b5faa73f3720c6182
• https://jira.xwiki.org/browse/XCOMMONS-1680
• https://jira.xwiki.org/browse/XCOMMONS-2426
• https://jira.xwiki.org/browse/XWIKI-9118
• https://nvd.nist.gov/vuln/detail/CVE-2023-29201
• https://github.com/advisories/GHSA-m3jr-cvhj-f35j

Repository: https://github.com/xwiki/xwiki-commons
Blast Radius: 17.2

Affected Packages