The request_path function in includes/bootstrap.inc in Drupal 7.14 and earlier allows remote attackers to obtain sensitive information via the q[] parameter to index.php, which reveals the installation path in an error message.
http://archives.neohapsis.com/archives/bugtraq/2012-05/0052.html
http://archives.neohapsis.com/archives/bugtraq/2012-05/0053.html
http://archives.neohapsis.com/archives/bugtraq/2012-05/0055.html
http://secunia.com/advisories/49131
https://exchange.xforce.ibmcloud.com/vulnerabilities/75531
http://www.mandriva.com/security/advisories?name=MDVSA-2013:074