Drupal core - Critical - Multiple Vulnerabilities - SA-CORE-2018-001

Project: 
Version: 
8.4.x-dev
7.x-dev
Date: 
2018-February-21
Vulnerability: 
Multiple Vulnerabilities
Description: 

This security advisory fixes multiple vulnerabilities in both Drupal 7 and Drupal 8. See below for a list.

Comment reply form allows access to restricted content - Critical - Drupal 8 - CVE-2017-6926

Users with permission to post comments are able to view content and comments they do not have access to, and are also able to add comments to this content.

This vulnerability is mitigated by the fact that the comment system must be enabled and the attacker must have permission to post comments.

JavaScript cross-site scripting prevention is incomplete - Critical - Drupal 7 and Drupal 8 - CVE-2017-6927

Drupal has a Drupal.checkPlain() JavaScript function which is used to escape potentially dangerous text before outputting it to HTML (as JavaScript output is not auto-escaped by either Drupal 7 or Drupal 8). This function does not correctly handle all methods of injecting malicious HTML, leading to a cross-site scripting vulnerability under certain circumstances.

The PHP functions which Drupal provides for HTML escaping are not affected.

Private file access bypass - Moderately Critical - Drupal 7 - CVE-2017-6928

When using Drupal's private file system, Drupal will check to make sure a user has access to a file before allowing the user to view or download it. This check fails under certain conditions in which one module is trying to grant access to the file and another is trying to deny it, leading to an access bypass vulnerability.

This vulnerability is mitigated by the fact that it only occurs for unusual site configurations.

jQuery vulnerability with untrusted domains - Moderately Critical - Drupal 7 - CVE-2017-6929

A jQuery cross site scripting vulnerability is present when making Ajax requests to untrusted domains (the CVE for this issue in jQuery is CVE-2015-9251). This vulnerability is mitigated by the fact that it requires contributed or custom modules in order to exploit.

For Drupal 8, this vulnerability was already fixed in Drupal 8.4.0 in the Drupal core upgrade to jQuery 3. For Drupal 7, it is fixed in the current release (Drupal 7.57) for jQuery 1.4.4 (the version that ships with Drupal 7 core) as well as for other newer versions of jQuery that might be used on the site, for example using the jQuery Update module.

Language fallback can be incorrect on multilingual sites with node access restrictions - Moderately Critical - Drupal 8 - CVE-2017-6930

When using node access controls with a multilingual site, Drupal marks the untranslated version of a node as the default fallback for access queries. This fallback is used for languages that do not yet have a translated version of the created node. This can result in an access bypass vulnerability.

This issue is mitigated by the fact that it only applies to sites that a) use the Content Translation module; and b) use a node access module such as Domain Access which implement hook_node_access_records().

Note that the update will mark the node access tables as needing a rebuild, which will take a long time on sites with a large number of nodes.

Settings Tray access bypass - Moderately Critical - Drupal 8 - CVE-2017-6931

The Settings Tray module has a vulnerability that allows users to update certain data that they do not have the permissions for.

If you have implemented a Settings Tray form in contrib or a custom module, the correct access checks should be added. This release fixes the only two implementations in core, but does not harden against other such bypasses.

This vulnerability can be mitigated by disabling the Settings Tray module.

External link injection on 404 pages when linking to the current page - Less Critical - Drupal 7 - CVE-2017-6932

Drupal core has an external link injection vulnerability when the language switcher block is used. A similar vulnerability exists in various custom and contributed modules. This vulnerability could allow an attacker to trick users into unwillingly navigating to an external site.

Solution: 

Install the latest version:

If you are using Drupal 8 , upgrade to Drupal 8.4.5 If you are using Drupal 7 , upgrade to Drupal 7.57
Reported By: 

Comment reply form allows access to restricted content - Critical - Drupal 8

Ivan

JavaScript cross-site scripting prevention is incomplete - Critical - Drupal 7 and Drupal 8)

Grant Gaudet

Private file access bypass - Moderately Critical - Drupal 7

Anders Olsson

jQuery vulnerability with untrusted domains - Moderately Critical - Drupal 7

will c

Language fallback can be incorrect on multilingual sites with node access restrictions - Moderately Critical - Drupal 8

Ken Rickard

Settings Tray access bypass - Moderately Critical - Drupal 8

Ted Bowman

External link injection on 404 pages when linking to the current page - Less Critical - Drupal 7

David Rothstein of the Drupal Security Team
Fixed By: 

Comment reply form allows access to restricted content - Critical - Drupal 8

Ivan Lee Rowlands of the Drupal Security Team David Rothstein of the Drupal Security Team Nathaniel Catchpole of the Drupal Security Team Jess of the Drupal Security Team Wim Leers Ted Bowman Matthew Donadio Tim Plunkett Peter Wolanin of the Drupal Security Team

JavaScript cross-site scripting prevention is incomplete - Critical - Drupal 7 and Drupal 8)

Grant Gaudet Kay Leung Heine Deelstra of the Drupal Security Team Peter Wolanin of the Drupal Security Team David Rothstein of the Drupal Security Team Jess of the Drupal Security Team Cash Williams of the Drupal Security Team Matthew Grill Fatima Sarah Khalid

Private file access bypass - Moderately Critical - Drupal 7

David Rothstein of the Drupal Security Team Lee Rowlands of the Drupal Security Team Jess of the Drupal Security Team Stefan Ruijsenaars of the Drupal Security Team Ken Rickard

jQuery vulnerability with untrusted domains - Moderately Critical - Drupal 7

Chris McCafferty of the Drupal Security Team Matthew Grill will c David Rothstein of the Drupal Security Team Greg Knaddison of the Drupal Security Team Jess of the Drupal Security Team Alex Bronstein of the Drupal Security Team

Language fallback can be incorrect on multilingual sites with node access restrictions - Moderately Critical - Drupal 8

Francesco Placella Gábor Hojtsy Michael Schmid Ken Rickard Tobias Zimmermann Jess of the Drupal Security Team Sascha Grossenbacher

Settings Tray access bypass - Moderately Critical - Drupal 8

Ted Bowman Lee Rowlands of the Drupal Security Team Wim Leers Jess of the Drupal Security Team Samuel Mortenson Daniel Wehner David Rothstein of the Drupal Security Team

External link injection on 404 pages when linking to the current page - Less Critical - Drupal 7

David Rothstein of the Drupal Security Team Samuel Mortenson
Original author: Drupal Security Team
Remembering J-P Stacey
DrupalCamp London 2-4 Mar'18

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