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Updated: 1 hour 59 min ago

Drupal Core - Moderately Critical - Multiple Vulnerabilities - SA-CORE-2014-006

November 19, 2014 - 11:21am
Description Session hijacking (Drupal 6 and 7)

A specially crafted request can give a user access to another user's session, allowing an attacker to hijack a random session.

This attack is known to be possible on certain Drupal 7 sites which serve both HTTP and HTTPS content ("mixed-mode"), but it is possible there are other attack vectors for both Drupal 6 and Drupal 7.

Denial of service (Drupal 7 only)

Drupal 7 includes a password hashing API to ensure that user supplied passwords are not stored in plain text.

A vulnerability in this API allows an attacker to send specially crafted requests resulting in CPU and memory exhaustion. This may lead to the site becoming unavailable or unresponsive (denial of service).

This vulnerability can be exploited by anonymous users.

CVE identifier(s) issued
  • A CVE identifier will be requested, and added upon issuance, in accordance
    with Drupal Security Team processes.
Versions affected
  • Drupal core 6.x versions prior to 6.34.
  • Drupal core 7.x versions prior to 7.34.

Install the latest version:

If you have configured a custom file for your Drupal 7 site you also need to make sure that it is not prone to the same denial of service vulnerability. See also the similar security advisory for the Drupal 6 contributed Secure Password Hashes module: SA-CONTRIB-2014-113

Also see the Drupal core project page.

Reported by

Session hijacking:

Denial of service:

Fixed by

Session hijacking:

Denial of service:

Coordinated by
  • The Drupal Security Team
Contact and More Information

The Drupal security team can be reached at security at or via the contact form at

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

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Drupal version: Drupal 6.xDrupal 7.x