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.

Affected: Maven: org.xwiki.platform:xwiki-platform-xar-model

### 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 <?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-…