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                                   CERT-Renater

                       Note d'Information No. 2021/VULN613
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DATE                : 18/11/2021

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Drupal core versions prior to
                                  9.2.9, 9.1.14, 8.9.20.

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https://www.drupal.org/sa-core-2021-011
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Drupal core - Moderately critical - Cross Site Scripting - SA-CORE-2021-011

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


Description:
The Drupal project uses the CKEditor library for WYSIWYG editing.
CKEditor has released a security update that impacts Drupal, along with
a hotfix for that update.

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
CVE-2021-41164: Advanced Content Filter (ACF) vulnerability allowing to
execute JavaScript code using malformed HTML
This advisory is not covered by Drupal Steward.


Solution:
Install the latest version:

If you are using Drupal 9.2, update to Drupal 9.2.9.
If you are using Drupal 9.1, update to Drupal 9.1.14.
If you are using Drupal 8.9, update to Drupal 8.9.20.
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 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 coordinated on the release with Drupal project.
See the CKEditor announcements above for the original reporters of the
vulnerabilities.


Fixed By:
xjm of the Drupal Security Team

Wim Leers
Greg Knaddison of the Drupal Security Team
Lauri Eskola
Ted Bowman


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+ CERT-RENATER       |    tel : 01-53-94-20-44          +
+ 23/25 Rue Daviel   |    fax : 01-53-94-20-41          +
+ 75013 Paris        |    email:cert@support.renater.fr +
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