View online: https://www.drupal.org/SA-CORE-2017-003

Drupal 8.3.4 and Drupal 7.56, are maintenance releases which contain fixes
for security vulnerabilities.

Download Drupal 8.3.4 [1]

Download Drupal 7.56 [2]

*Updating your existing Drupal 8 and 7 sites is strongly recommended (see
instructions for Drupal 8 [3] and for Drupal 7 [4]).* 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 [5] and the 7.56 release
notes [6] 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 [7]
* 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 [8] for the public file system.

——– VERSIONS AFFECTED
—————————————————

* Drupal core 7.x versions prior to 7.56 [9]
* Drupal core 8.x versions prior to 8.3.4 [10]

——– SOLUTION
————————————————————

Install the latest version:

* If you use Drupal 7.x, upgrade to Drupal core 7.56 [11]
* If you use Drupal 8.x, upgrade to Drupal core 8.3.4 [12]

Also see the Drupal core [13] project page.

——– REPORTED BY
———————————————————

…. PECL YAML parser unsafe object handling

* Samuel Mortenson [14]

…. File REST resource does not properly validate

* Samuel Mortenson [15]

…. Files uploaded by anonymous users into a private file system can be
accessed by other anonymous users

* Greg Knaddison [16] of the Drupal Security team
* Mori Sugimoto [17] of the Drupal Security team
* iancawthorne [18]

——– FIXED BY
————————————————————

…. PECL YAML parser unsafe object handling

* XJM [19] of the Drupal Security team
* Alex Pott [20] of the Drupal Security team
* Peter Wolanin [21] of the Drupal Security team

…. File REST resource does not properly validate

* Samuel Mortenson [22]
* Wim Leers [23]
* Alex Pott [24] of the Drupal Security team
* XJM [25] of the Drupal Security team
* Sascha Grossenbacher [26]

…. Files uploaded by anonymous users into a private file system can be
accessed by other anonymous users

* David Rothstein [27] of the Drupal Security team
* Peter Wolanin [28] of the Drupal Security team
* Michael Hess [29] of the Drupal Security team
* XJM [30] of the Drupal Security team
* Chris McCafferty [31] of the Drupal Security team
* Lee Rowlands [32] of the Drupal Security team
* Alex Pott [33] of the Drupal Security team
* Nathaniel Catchpole [34] of the Drupal Security team
* Stefan Ruijsenaars [35] of the Drupal Security team
* Nate Haug [36]
* Gareth Goodwin [37]

——– 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 [38].

Learn more about the Drupal Security team and their policies [39], writing
secure code for Drupal [40], and securing your site [41].

Follow the Drupal Security Team on Twitter at
https://twitter.com/drupalsecurity [42]

[1] http://ftp.drupal.org/files/projects/drupal-8.3.4.tar.gz
[2] http://ftp.drupal.org/files/projects/drupal-7.56.tar.gz
[3] https://www.drupal.org/node/2700999
[4] https://www.drupal.org/node/1494290
[5] https://www.drupal.org/project/drupal/releases/8.3.4
[6] https://www.drupal.org/project/drupal/releases/7.56
[7] https://www.drupal.org/project/drupal
[8] https://www.drupal.org/psa-2016-003
[9] https://www.drupal.org/project/drupal/releases/7.56
[10] https://www.drupal.org/project/drupal/releases/8.3.4
[11] https://www.drupal.org/project/drupal/releases/7.56
[12] https://www.drupal.org/project/drupal/releases/8.3.4
[13] https://www.drupal.org/project/drupal
[14] https://www.drupal.org/user/2582268
[15] https://www.drupal.org/user/2582268
[16] https://www.drupal.org/u/greggles
[17] https://www.drupal.org/u/dokumori
[18] https://www.drupal.org/u/iancawthorne
[19] https://www.drupal.org/u/xjm
[20] https://www.drupal.org/u/alexpott
[21] https://www.drupal.org/u/pwolanin
[22] https://www.drupal.org/u/samuel.mortenson
[23] https://www.drupal.org/u/wim-leers
[24] https://www.drupal.org/u/alexpott
[25] https://www.drupal.org/u/xjm
[26] https://www.drupal.org/u/Berdir
[27] https://www.drupal.org/u/David_Rothstein
[28] https://www.drupal.org/u/pwolanin
[29] https://www.drupal.org/u/mlhess
[30] https://www.drupal.org/u/xjm
[31] https://www.drupal.org/u/cilefen
[32] https://www.drupal.org/u/larowlan
[33] https://www.drupal.org/u/alexpott
[34] https://www.drupal.org/u/catch
[35] https://www.drupal.org/u/stefanr-0
[36] https://www.drupal.org/u/quicksketch
[37] https://www.drupal.org/u/smaz
[38] https://www.drupal.org/contact
[39] https://www.drupal.org/security-team
[40] https://www.drupal.org/writing-secure-code
[41] https://www.drupal.org/security/secure-configuration
[42] https://twitter.com/drupalsecurity

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