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CVE-2023-27480: XWIKI-20320: Disallow DOCTYPE in the XAR descriptor · xwiki/xwiki-platform@e3527b9
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.
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XWIKI-20320: Disallow DOCTYPE in the XAR descriptor
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@@ -515,6 +515,8 @@ public void readDescriptor(InputStream stream) throws XarException, IOException
DocumentBuilder dBuilder;
try {
// Prevent XXE attack
dbFactory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
dBuilder = dbFactory.newDocumentBuilder();
} catch (ParserConfigurationException e) {
throw new XarException("Failed to create a new Document builder", e);
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### 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...