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             AUSCERT External Security Bulletin Redistribution

        ImageCache Actions - Critical - Multiple Vulnerabilities -
                               18 July 2019


        AusCERT Security Bulletin Summary

Product:           Drupal Contrib ImageCache
Publisher:         Drupal
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Modify Arbitrary Files   -- Existing Account
                   Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade

Original Bulletin: 

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 ImageCache Actions - Critical - Multiple Vulnerabilities - SA-CONTRIB-2019-056

   ImageCache Actions
   Security risk:
   Critical 17/25 AC:Basic/A:Admin/CI:All/II:All/E:Theoretical/TD:All
   Multiple Vulnerabilities

   The imagecache actions module defines a number of additional image effects
   that can be used to create image styles. The "Image styles admin" sub
   module provides additional functionality to duplicate, export and import
   image styles. The module uses unserialize() to import image styles into
   another site where unserialize() is known to have security issues when
   processing potentially unsafe input.

   This vulnerability is mitigated by the fact that the "Image styles admin"
   sub module must be enabled and an attacker must have a role with the
   permission "'administer image styles'".

   Furthermore, the import functionality supports PHP code included in image
   effects as part of an image style, which would run on image derivative
   generation subject to the PHP module being enabled. This is intended
   behaviour for the "Image styles admin" sub module, but the user access
   restrictions should reflect the potential risks involved.

   The new security release of this module introduces a new "import image
   styles" permission which is marked as restricted. In order to use the
   image style import functionality, users will need to have a role which has
   this new permission in addition to "administer image styles" (which is not
   marked as restricted).


     * If you use the Imagecache Actions module for Drupal 7.x, upgrade to
       Imagecache Actions 7.x-1.10.
     * Image Effects, the D8 successor is *not* vulnerable to this exploit.

   Reported By:

     * Ruben Hofman

   Fixed By:

     * Erwin Derksen
     * Greg Knaddison of the Drupal Security Team

   Coordinated By:

     * Greg Knaddison of the Drupal Security Team
     * Ivo Van Geertruyen of the Drupal Security Team
     * Drew Webber of the Drupal Security Team

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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