include/iniset.php in Roundcube Webmail 0.5.4 and earlier, when PHP 5.3.7 or 5.3.8 is used, allows remote attackers to trigger a GET request for an arbitrary URL, and cause a denial of service (resource consumption and inbox outage), via a Subject header containing only a URL, a related issue to CVE-2011-3379.
https://exchange.xforce.ibmcloud.com/vulnerabilities/71025
http://www.securityfocus.com/bid/50402
http://trac.roundcube.net/ticket/1488086
http://openwall.com/lists/oss-security/2011/10/26/6
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041