[Security-news] Drupal core - Moderately critical - Cross Site Scripting - SA-CORE-2021-011

[security-news at drupal.org]

View online: https://www.drupal.org/sa-core-2021-011

Project: Drupal core [1]
Date: 2021-November-17
Security risk: *Moderately critical* 13∕25
AC:Basic/A:User/CI:Some/II:Some/E:Theoretical/TD:Default [2]
Vulnerability: Cross Site Scripting

Description: 
The Drupal project uses the CKEditor [3] library for WYSIWYG editing.
CKEditor has released a security update that impacts Drupal [4].

Vulnerabilities are possible if Drupal is configured to allow use of the
CKEditor library for WYSIWYG editing. An attacker that can create or edit
content (even without access to CKEditor themselves) may be able to exploit
one or more Cross-Site Scripting (XSS) vulnerabilities to target users with
access to the WYSIWYG CKEditor, including site admins with privileged access.

For more information, see CKEditor's security advisories:

   * CVE-2021-41165: HTML comments vulnerability allowing to execute 
JavaScript
     code [5]
   * CVE-2021-41164: Advanced Content Filter (ACF) vulnerability allowing to
     execute JavaScript code using malformed HTML [6]

This advisory is not covered by Drupal Steward [7].

Solution: 
Install the latest version:

   * If you are using Drupal 9.2, update to Drupal 9.2.9 [8].
   * If you are using Drupal 9.1, update to Drupal 9.1.14 [9].
   * If you are using Drupal 8.9, update to Drupal 8.9.20 [10].

Versions of Drupal prior to 9.1.x are end-of-life and do not receive security
coverage.

Note that Drupal 8 has reached its end of life [11] so this is the final
security release provided for Drupal 8.

Drupal 7 core does not include the CKEditor module and therefore is not
affected.

Reported By: 
   * Jacek Bogdański [12] coordinated on the release with Drupal project.
   * See the CKEditor announcements above for the original reporters of the
     vulnerabilities.

Fixed By: 
   * xjm [13] of the Drupal Security Team
   * Wim Leers [14]
   * Greg Knaddison [15] of the Drupal Security Team
   * Lauri Eskola [16]
   * Ted Bowman [17]


[1] https://www.drupal.org/project/drupal
[2] https://www.drupal.org/security-team/risk-levels
[3] https://github.com/ckeditor/ckeditor4
[4] https://ckeditor.com/cke4/release/CKEditor-4.17.0
[5]
https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-7h26-63m7-qhf2
[6]
https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-pvmx-g8h5-cprj
[7] https://www.drupal.org/steward
[8] https://www.drupal.org/project/drupal/releases/9.2.9
[9] https://www.drupal.org/project/drupal/releases/9.1.14
[10] https://www.drupal.org/project/drupal/releases/8.9.20
[11] https://www.drupal.org/psa-2021-06-29
[12] https://www.drupal.org/user/3683355
[13] https://www.drupal.org/user/65776
[14] https://www.drupal.org/user/99777
[15] https://www.drupal.org/user/36762
[16] https://www.drupal.org/user/1078742
[17] https://www.drupal.org/user/240860