ghsa-m3jr-cvhj-f35j
Vulnerability from github
Published
2023-04-12 20:38
Modified
2023-04-25 21:00
Severity ?
9.0 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Summary
org.xwiki.commons:xwiki-commons-xml Cross-site Scripting vulnerability
Details

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:

javascript {{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

Show details on source website

To clipboard 

{
   affected: [
      {
         package: {
            ecosystem: "Maven",
            name: "org.xwiki.commons:xwiki-commons-xml",
         },
         ranges: [
            {
               events: [
                  {
                     introduced: "4.2-milestone-1",
                  },
                  {
                     fixed: "14.6-rc-1",
                  },
               ],
               type: "ECOSYSTEM",
            },
         ],
      },
   ],
   aliases: [
      "CVE-2023-29201",
   ],
   database_specific: {
      cwe_ids: [
         "CWE-79",
      ],
      github_reviewed: true,
      github_reviewed_at: "2023-04-12T20:38:17Z",
      nvd_published_at: "2023-04-15T15:15:00Z",
      severity: "CRITICAL",
   },
   details: "### Impact\nThe \"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:\n\n```javascript\n{{html}}\n<a href='' onclick='alert(1)'>XSS</a>\n{{/html}}\n```\n\nWhen 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.\n\n### Patches\nThis 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.\n\n### Workarounds\nThere are no known workarounds apart from upgrading to a version including the fix.\n\n### References\n* https://github.com/xwiki/xwiki-commons/commit/b11eae9d82cb53f32962056b5faa73f3720c6182 - the patch with the filter\n* https://github.com/xwiki/xwiki-commons/commit/4a185e0594d90cd4916d60aa60bb4333dc5623b2 - the patch with the definitions what is allowed\n* https://jira.xwiki.org/browse/XWIKI-9118 - the security issue with the HTML macro\n* https://jira.xwiki.org/browse/XCOMMONS-1680 - the issue regarding a definition of what is allowed HTML\n* https://jira.xwiki.org/browse/XCOMMONS-2426 - the issue regarding the filter that fixes the security issue\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [Jira XWiki](https://jira.xwiki.org/)\n* Email us at [XWiki Security mailing-list](mailto:security@xwiki.org)",
   id: "GHSA-m3jr-cvhj-f35j",
   modified: "2023-04-25T21:00:29Z",
   published: "2023-04-12T20:38:17Z",
   references: [
      {
         type: "WEB",
         url: "https://github.com/xwiki/xwiki-commons/security/advisories/GHSA-m3jr-cvhj-f35j",
      },
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2023-29201",
      },
      {
         type: "WEB",
         url: "https://github.com/xwiki/xwiki-commons/commit/4a185e0594d90cd4916d60aa60bb4333dc5623b2",
      },
      {
         type: "WEB",
         url: "https://github.com/xwiki/xwiki-commons/commit/b11eae9d82cb53f32962056b5faa73f3720c6182",
      },
      {
         type: "PACKAGE",
         url: "https://github.com/xwiki/xwiki-commons",
      },
      {
         type: "WEB",
         url: "https://jira.xwiki.org/browse/XCOMMONS-1680",
      },
      {
         type: "WEB",
         url: "https://jira.xwiki.org/browse/XCOMMONS-2426",
      },
      {
         type: "WEB",
         url: "https://jira.xwiki.org/browse/XWIKI-9118",
      },
   ],
   schema_version: "1.4.0",
   severity: [
      {
         score: "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H",
         type: "CVSS_V3",
      },
   ],
   summary: "org.xwiki.commons:xwiki-commons-xml Cross-site Scripting vulnerability",
}


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