FreePBX 2.5.1, and other 2.4.x, 2.5.x, and pre-release 2.6.x versions, generates different error messages for a failed login attempt depending on whether the user account exists, which allows remote attackers to enumerate valid usernames.Referenceshttp://www.osvdb.org/54263http://freepbx.org/trac/ticket/3660http://secunia.com/advisories/34772http://www.securityfocus.com/bid/34857
