Dropbear SSH Server before 2013.59 generates error messages for a failed logon attempt with different time delays depending on whether the user account exists, which allows remote attackers to discover valid usernames.Referenceshttp://secunia.com/advisories/55173https://matt.ucc.asn.au/dropbear/CHANGEShttp://www.securityfocus.com/bid/62993http://www.openwall.com/lists/oss-security/2013/10/16/11http://lists.opensuse.org/opensuse-updates/2013-11/msg00046.htmlhttps://support.citrix.com/article/CTX216642http://lists.opensuse.org/opensuse-updates/2013-10/msg00061.htmlhttps://secure.ucc.asn.au/hg/dropbear/rev/d7784616409a
