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             AUSCERT External Security Bulletin Redistribution

Drupal core - Moderately critical - Cross Site Scripting - SA-CORE-2021-011
                             18 November 2021


        AusCERT Security Bulletin Summary

Product:           Drupal core
Publisher:         Drupal
Operating System:  UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade

Original Bulletin: 

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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

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].

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

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

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

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
[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

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