WebKit, as used in Apple iOS before 8.3 and Apple Safari before 6.2.5, 7.x before 7.1.5, and 8.x before 8.0.5, does not properly handle the userinfo field in FTP URLs, which allows remote attackers to trigger incorrect resource access via unspecified vectors.
https://support.apple.com/HT204661
https://support.apple.com/HT204658
http://www.securitytracker.com/id/1032047
http://lists.apple.com/archives/security-announce/2015/Apr/msg00002.html
http://lists.apple.com/archives/security-announce/2015/Apr/msg00000.html