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CVE-2022-36093: XWIKI-19558: Only load vm templates in xpart.vm · xwiki/xwiki-platform@70c64c2

XWiki Platform Web Templates are templates for XWiki Platform, a generic wiki platform. By passing a template of the distribution wizard to the xpart template, user accounts can be created even when user registration is disabled. This also circumvents any email verification. Before versions 14.2 and 13.10.4, this can also be exploited on a private wiki, thus potentially giving the attacker access to the wiki. Depending on the configured default rights of users, this could also give attackers write access to an otherwise read-only public wiki. Users can also be created when an external authentication system like LDAP is configured, but authentication fails unless the authentication system supports a bypass/local accounts are enabled in addition to the external authentication system. This issue has been patched in XWiki 13.10.5 and 14.3RC1. As a workaround, one may replace xpart.vm, the entry point for this attack, by a patched version from the patch without updating XWiki.

CVE
#web#redis#ldap#auth

@@ -0,0 +1,67 @@

/*

* See the NOTICE file distributed with this work for additional

* information regarding copyright ownership.

*

* This is free software; you can redistribute it and/or modify it

* under the terms of the GNU Lesser General Public License as

* published by the Free Software Foundation; either version 2.1 of

* the License, or (at your option) any later version.

*

* This software is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

* Lesser General Public License for more details.

*

* You should have received a copy of the GNU Lesser General Public

* License along with this software; if not, write to the Free

* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA

* 02110-1301 USA, or see the FSF site: http://www.fsf.org.

*/

package org.xwiki.web;

import org.junit.jupiter.api.BeforeEach;

import org.junit.jupiter.api.Test;

import org.xwiki.template.TemplateManager;

import org.xwiki.test.page.PageTest;

import static org.junit.jupiter.api.Assertions.assertEquals;

import static org.junit.jupiter.api.Assertions.assertTrue;

/**

* Tests the {@code xpart.vm} template.

*

* @version $Id$

* @since 14.3RC1

* @since 13.10.5

*/

class XPartPageTest extends PageTest

{

private static final String X_PART_VM = "xpart.vm";

private static final String VM_PARAMETER = "vm";

private TemplateManager templateManager;

@BeforeEach

void setUp() throws Exception

{

this.templateManager = this.componentManager.getInstance(TemplateManager.class);

this.request.put("xpage", “xpart”);

}

@Test

void renderRegisterTemplate() throws Exception

{

this.request.put(VM_PARAMETER, “register.vm”);

String result = this.templateManager.render(X_PART_VM);

assertTrue(result.contains(“<form id=\"register\"”));

}

@Test

void renderForbiddenTemplate() throws Exception

{

this.request.put(VM_PARAMETER, “distribution/firstadminuser.wiki”);

String result = this.templateManager.render(X_PART_VM);

assertEquals("Invalid template.", result.trim());

}

}

Related news

GHSA-h5j3-5x63-p8jv: XWiki Platform Web Templates vulnerable to Unauthorized User Registration Through the Distribution Wizard

### Impact By passing a template of the distribution wizard to the xpart template, user accounts can be created even when user registration is disabled. This also circumvents any email verification. Before versions 14.2 and 13.10.4, this can also be exploited on a private wiki, thus potentially giving the attacker access to the wiki. Depending on the configured default rights of users, this could also give attackers write access to an otherwise read-only public wiki. Users can also be created when an external authentication system like LDAP is configured, but authentication fails unless the authentication system supports a bypass/local accounts are enabled in addition to the external authentication system. ### Patches This issue has been patched in XWiki 13.10.5 and 14.3RC1. ### Workarounds It is possible to replace `xpart.vm`, the entry point for this attack, by a patched version from the [patch](https://github.com/xwiki/xwiki-platform/commit/70c64c23f4404f33289458df2a08f7c4be022755...

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