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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.1559 Drupal Core - Multiple Vulnerabilities - SA-CORE-2017-003 22 June 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Drupal Core Publisher: Drupal Security Team Operating System: Windows UNIX specific Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Create Arbitrary Files -- Existing Account Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2017-6922 CVE-2017-6921 CVE-2017-6920 Original Bulletin: https://www.drupal.org/SA-CORE-2017-003 - --------------------------BEGIN INCLUDED TEXT-------------------- Drupal Core - Multiple Vulnerabilities - SA-CORE-2017-003 Posted by Drupal Security Team on 21 Jun 2017 at 17:44 UTC Drupal 8.3.4 and Drupal 7.56 are maintenance releases which contain fixes for security vulnerabilities. Download Drupal 8.3.4 Download Drupal 7.56 Updating your existing Drupal 8 and 7 sites is strongly recommended (see instructions for Drupal 8 and for Drupal 7). This release fixes security issues only; there are no new features nor non-security-related bug fixes in this release. See the 8.3.4 release notes and the 7.56 release notes for details on important changes and known issues affecting this release. Read on for details of the security vulnerabilities that were fixed in this release. Advisory ID: DRUPAL-SA-CORE-2017-003 Project: Drupal core Version: 7.x, 8.x Date: 2017-June-21 Multiple vulnerabilities Description PECL YAML parser unsafe object handling - Critical - Drupal 8 - CVE-2017-6920 PECL YAML parser does not handle PHP objects safely during certain operations within Drupal core. This could lead to remote code execution. File REST resource does not properly validate - Less Critical - Drupal 8 - CVE-2017-6921 The file REST resource does not properly validate some fields when manipulating files. A site is only affected by this if the site has the RESTful Web Services (rest) module enabled, the file REST resource is enabled and allows PATCH requests, and an attacker can get or register a user account on the site with permissions to upload files and to modify the file resource. Files uploaded by anonymous users into a private file system can be accessed by other anonymous users - Moderately Critical - Drupal 7 and Drupal 8 - CVE-2017-6922 Private files that have been uploaded by an anonymous user but not permanently attached to content on the site should only be visible to the anonymous user that uploaded them, rather than all anonymous users. Drupal core did not previously provide this protection, allowing an access bypass vulnerability to occur. This issue is mitigated by the fact that in order to be affected, the site must allow anonymous users to upload files into a private file system. The security team has also received reports that this vulnerability is being exploited for spam purposes, similar to the scenario discussed in PSA-2016-003 for the public file system. Versions affected Drupal core 7.x versions prior to 7.56 Drupal core 8.x versions prior to 8.3.4 Solution Install the latest version: If you use Drupal 7.x, upgrade to Drupal core 7.56 If you use Drupal 8.x, upgrade to Drupal core 8.3.4 Also see the Drupal core project page. Reported by PECL YAML parser unsafe object handling Heine Deelstra File REST resource does not properly validate Samuel Mortenson Files uploaded by anonymous users into a private file system can be accessed by other anonymous users Greg Knaddison of the Drupal Security team Mori Sugimoto of the Drupal Security team iancawthorne Fixed by PECL YAML parser unsafe object handling XJM of the Drupal Security team Alex Pott of the Drupal Security team Peter Wolanin of the Drupal Security team File REST resource does not properly validate Samuel Mortenson Wim Leers Alex Pott of the Drupal Security team XJM of the Drupal Security team Sascha Grossenbacher Files uploaded by anonymous users into a private file system can be accessed by other anonymous users David Rothstein of the Drupal Security team Peter Wolanin of the Drupal Security team Michael Hess of the Drupal Security team XJM of the Drupal Security team Chris McCafferty of the Drupal Security team Lee Rowlands of the Drupal Security team Alex Pott of the Drupal Security team Nathaniel Catchpole of the Drupal Security team Stefan Ruijsenaars of the Drupal Security team Nate Haug Gareth Goodwin Contact and More Information The Drupal security team can be reached at security at drupal.org or via the contact form at https://www.drupal.org/contact. 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 at https://twitter.com/drupalsecurity⋅ Categories: Drupal 7.x, Drupal 8.x - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWUsOhox+lLeg9Ub1AQixJQ//QmyKfsUmANC7YXS7W+FWlHmCdrc8cRY6 uMxgUdOrrvFNtDOpcvqkSkFz+qRqzM0TKLuMzabfJDoYdqBO2OP+VdxnlA+dE7Hm waJ3+9P4ZSWTPdVwvZ7ypFdcK8mLMr8/wTXpujfPCen7Ur/P7Fe6VaqmK2uGfggL y7k8+G2hcql0qfKlB7jtHXcgvM6L9gnDHQsdTO9GaCD9gZ69rE3M0bVUiIpWbunX lkQ74NYmNZQXuH3Onk5GZgFbWZIxgBpQUvkViyVFM/GfDuY/5ecomxSnEv96npRl H1xub2d6FcIo8PsODGdmbuMO0w+0jML85ScXq/iczKPpPZbOJaY3gUlJxTWWcYhY li3CsbLP0+/vLWHwtcbEsq5YUCT1OtGlS7+8wrTpd4TGyKs4m+9YqFqzwr3ded7/ RHRm8eXUaWFkYoq54M3E1mP3w0YaITJHCMW9fOAJx1+AdulOVJXkHLG6M8xoElvm TnYRjD0ASdGQMq6Jq+G2NOcM6EVtrkaIVlKSJ/8VxKoIWFkE+qLO1KTDWWhqIvNN FsUj0oja63S8VZp+PN5B6Zy6KYaCjGiF00Sw6mA9uovD+cOWTLxcuybpytfkjXeD 4jBzxSgbjrzPQlRwNwPyjaULKhTiiyLFvyKLlixQTZ+EV02Zp/zPsNeXsAZBId+8 H8aQ9MQQNM4= =8wS6 -----END PGP SIGNATURE-----