Drupal core: Cross-site Scripting -- Remote with User Interaction

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1232
Drupal core - Moderately critical - Cross Site Scripting - SA-CORE-2018-003
                               20 April 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

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

Original Bulletin: 
   https://www.drupal.org/sa-core-2018-003

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Drupal core - Moderately critical - Cross Site Scripting - SA-CORE-2018-003

Project:        Drupal core

Date:           2018-April-18

Security risk:  Moderately critical 12/25 

AC:Complex/A:User/CI:Some/II:Some/E:Theoretical/TD:Default

Vulnerability:  Cross Site Scripting

Description: 

CKEditor, a third-party JavaScript library included in Drupal core, has fixed a
cross-site scripting (XSS) vulnerability. The vulnerability stemmed from the
fact that it was possible to execute XSS inside CKEditor when using the image2
plugin (which Drupal 8 core also uses).

We would like to thank the CKEditor team for patching the vulnerability and
coordinating the fix and release process, and matching the Drupal core security
window.

Solution: 

  o If you are using Drupal 8, update to Drupal 8.5.2 or Drupal 8.4.7.
  o The Drupal 7.x CKEditor contributed module is not affected if you are
    running CKEditor module 7.x-1.18 and using CKEditor from the CDN, since it
    currently uses a version of the CKEditor library that is not vulnerable.
  o If you installed CKEditor in Drupal 7 using another method (for example
    with the WYSIWYG module or the CKEditor module with CKEditor locally) and
    you're using a version of CKEditor from 4.5.11 up to 4.9.1, update the
    third-party JavaScript library by downloading CKEditor 4.9.2 from
    CKEditor's site.

Reported By: 

  o Kyaw Min Thein

Fixed By: 

  o Marek Lewandowski of the CKEditor team
  o Wiktor Walc of the CKEditor team
  o Wim Leers
  o xjm Of the Drupal Security Team
  o Lee Rowlands of the Drupal Security Team
  o Daniel Wehner
  o Hai-Nam Nguyen
  o Matthew Grill

Contact and more information

The Drupal security team can be reached by email at security at drupal.org or
via the contact form.

Learn more about the Drupal Security team and their policies, writing secure
code for Drupal, and securing your site.

Follow the Drupal Security Team on Twitter @drupalsecurity

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