MediaWiki 1.24.x before 1.24.2, when using PBKDF2 for password hashing, allows remote attackers to cause a denial of service (CPU consumption) via a long password.
https://security.gentoo.org/glsa/201510-05
https://phabricator.wikimedia.org/T64685
https://lists.wikimedia.org/pipermail/mediawiki-announce/2015-March/000175.html
http://www.securityfocus.com/bid/73477
http://www.openwall.com/lists/oss-security/2015/04/07/3
http://www.openwall.com/lists/oss-security/2015/04/01/1
http://www.mandriva.com/security/advisories?name=MDVSA-2015:200